Section 408.10199. Tables.

Tables 1 to 31 read as follows:

TABLES 1 TO 31

TABLE 1 GUARD EXPOSURE ANGLE
Grinder Type	Exposure Above or Below Horizontal Plane	Total Exposure
Bench and Floor	65 degrees above	*90 degrees
Cylindrical Grinder	65 degrees above	180 degrees
Surface Grinder	15 degrees below	150 degrees
Cut-off Machine	15 degrees below	150 degrees
Swing Frame		180 degrees
Snagging		180 degrees
Top	30 degrees above	60 degrees
Portable		180 degrees
Masonry and Concrete Saws	35 degrees above	180 degrees
Tool and Cutter Grinder		180 degrees
*Whenever the nature of the work requires contact with the abrasive wheel below the horizontal plane of the spindle, the exposure shall not exceed 125 degrees.

TABLE 2 GUIDE FOR CONSTRUCTION OF DRAWN STEEL GUARDS FOR WHEEL 2” THICK AND LESS, 8” AND LESS IN DIAMETER
*Material Used in Construction of Guard Hot Rolled Steel SAE 1008 Min. Tensile Strength 60,000 PSI for speeds up to (SFPM)	Maximum Thickness of Wheel, Inches	2 to 5 inches		Above 5 to 8 inches
		A Inches	B Inches	A Inches	B Inches
9,500	2	1/16	1/16	3/32	1/16
12,500	2	3/32	1/16	3/32	3/32
17,000	1	3/32	1/16	1/8	3/32
*The recommendations listed in the above table are guides for the conditions stated. Other material, designs or dimensions affording equal or superior protection are also acceptable.

TABLE 3 DRAWN STEEL GUARD FOR PORTABLE GRINDERS USED WITH DEPRESSED CENTER WHEELS
Material Used in Construction of Guard		Thickness of Wheel	Wheel Diameter Inches	A Inches	B Inches
For speeds up to 14,200 SFPM	*Hot Rolled Steel SAE 1008 min. tensile strength 60,000 PSI	3/8 inches or less	2 to 9	1/16	1/2
		Over 3/8 to 1 inch	7 to 9	3/32	1 1/8
*The recommendations listed in the above table are guides for the conditions stated. Other material, designs or dimensions affording equal or superior protection are also acceptable.

TABLE 4 TABLE FOR FABRICATED STEEL GUARDS FOR SQUARED OR TAPERED CUP WHEELS
Wheel Diameter*	Back Thickness	*Band Thickness	Bolts Connecting Band to Back Member
4”	.056 – .064	.112 – .128	3 5/16 – 18
5”	.082 – .098	.112 – .128	3 5/16 – 18
6”	.082 – .098	.112 – .128	3 3/8 – 16

TABLE 5 TABLE FOR DRAWN STEEL GUARDS FOR TAPERED CUP WHEELS
Wheel Diameter	“A”	No.	Bolts to Machine	No.	Bolts Connecting Hood to Band	Washer Back Plate Thickness	“B” O.D.	*“C” Hood	*”D” Band
4”	1 7/8	4	1/4 – 20	3	5/16 – 18 x 3/4	.097 – .112	4	.056 – .064	.112 – .128
5”	2 1/8	4	5/16 – 18	3	5/16 – 18 x 3/4	.097 – .112	4 3/4	.082 – .098	.112 – .128
6”	2 5/8	4	5/16 – 18	4	5/16 – 18 x 3/4	.097 – .112	4 3/4	.082 – .098	.112 – .128
*The recommendations listed in the above tables are guides for the conditions stated. Other material, designs or dimensions affording equal or superior protection are also acceptable.

TABLE 6 MINIMUM BASIC THICKNESSES OF PERIPHERAL AND SIDE MEMBERS FOR SAFETY GUARDS

Material Used in Construction of Guard

Maximum Thickness of Grinding Wheel

GRINDING WHEEL DIAMETERS

3 to 6 inches

Over 6 to 12 inches

Over 12 to 16 inches

Over 16 to 20 inches

Over 20 to 24 inches

Over 24 to 30 inches

Over 30 to 48 inches

A

B

A

B

A

B

A

B

A

B

A

B

A

B

Inches

Inches

Inches

Inches

Inches

Inches

Inches

Inches

Material Satisfactory* for speeds up to 8,000 SFPM

Cast Iron (Min. Tensile Strength 20,000 PSI) Class 20

2

1/4

1/4

3/8

5/16

1/2

3/8

5/8

1/2

7/8

5/8

1

3/4

1 1/4

1

4

5/16

5/16

3/8

5/16

1/2

3/8

3/4

5/8

1

5/8

1 1/8

3/4

1 3/8

1

6

3/8

5/16

1/2

7/16

5/8

1/2

1

5/8

1 1/8

3/4

1 1/4

7/8

1 1/2

1 1/8

8

5/8

9/16

7/8

3/4

1

3/4

1 1/8

3/4

1 1/4

7/8

1 1/2

1 1/8

10

3/4

11/16

7/8

3/4

1

3/4

1 1/8

3/4

1 1/4

7/8

1 1/2

1 1/8

16

1 1/8

1

1 1/4

1

1 5/16

1

1 7/16

1 1/16

1 3/4

1 3/8

20

1 3/8

1 1/8

1 3/8

1 1/8

1 1/2

1 3/8

2

1 5/8

Material Satisfactory * for speeds up to 9,000 SFPM

Malleable Iron (Min. Tensile Strength 50,000 PSI) Grade 32510

2

1/4

1/4

3/8

5/16

1/2

3/8

5/8

1/2

3/4

5/8

7/8

3/4

1

7/8

4

5/16

5/16

3/8

5/16

1/2

3/8

5/8

1/2

3/4

5/8

7/8

3/4

1 1/8

7/8

6

3/8

5/16

1/2

7/16

5/8

1/2

3/4

5/8

7/8

5/8

1

3/4

1 1/4

7/8

8

1/2

7/16

5/8

1/2

3/4

5/8

7/8

5/8

1

3/4

1 1/4

7/8

10

1/2

7/16

5/8

1/2

3/4

5/8

7/8

5/8

1

3/4

1 1/4

7/8

16

13/16

11/16

13/16

11/16

1

3/4

1 1/8

7/8

1 3/8

1

20

7/8

3/4

1

3/4

1 1/8

7/8

1 1/2

1 1/8

Material Satisfactory* for speeds up to 16,000 SFPM

Steel Castings (Min. Tensile Strength 60,000 PSI) Grade V60-30

2

1/4

1/4

5/16

5/16

3/8

3/8

1/2

7/16

5/8

1/2

3/4

5/8

7/8

3/4

4

1/4

1/4

1/2

1/2

1/2

1/2

9/16

1/2

5/8

1/2

3/4

5/8

1

3/4

6

3/8

1/4

3/4

5/8

3/4

5/8

3/4

5/8

13/16

11/16

13/16

11/16

1 1/8

3/4

8

7/8

3/4

7/8

3/4

7/8

3/4

7/8

3/4

15/16

13/16

1 3/8

1

10

1

7/8

1

7/8

1

7/8

1 1/8

15/16

1 1/8

1

1 7/16

1 1/16

16

1 1/4

1 1/8

1 1/4

1 1/8

1 1/4

1 1/8

1 1/4

1 1/8

1 13/16

1 7/16

20

1 3/8

1 1/4

1 3/8

1 1/4

1 7/16

1 5/16

2 1/16

1 11/16

Structural Steel (Min. Tensile 60,000 PSI)

2

1/8

1/16

5/16

1/4

5/16

1/4

5/16

1/4

5/16

1/4

3/8

5/16

1/2

3/8

4

1/8

1/16

3/8

5/16

3/8

5/16

3/8

5/16

3/8

5/16

3/8

5/16

1/2

3/8

6

3/16

1/16

1/2

3/8

7/16

3/8

7/16

3/8

7/16

3/8

7/16

3/8

3/4

1/2

8

1/2

3/8

9/16

7/16

9/16

7/16

9/16

7/16

5/8

1/2

3/4

1/2

10

9/16

7/16

5/8

1/2

5/8

1/2

5/8

1/2

5/8

1/2

7/8

5/8

16

5/8

9/16

3/4

5/8

3/4

5/8

13/16

11/16

1 1/16

13/16

20

13/16

11/16

13/16

11/16

7/8

3/4

1 3/16

15/16

*The recommendations listed in the above table are guides for the conditions stated. Other material, designs or dimensions affording equal or superior protections are also acceptable.

Page 31

TABLE 7 MINIMUM BASIC THICKNESS FOR PERIPHERAL AND SIDE  MEMBERS FOR SAFETY GUARDS USED WITH CUTTING-OFF WHEELS

Material Used in Construction of Guard

Maximum Thickness of Cutting Off Wheel

Speed Not to Exceed

Cutting Off Wheel Diameters

6 to 11 inches

Over 11 to 20 inches

Over 20 to 30 inches

Over 30 to 48 inches

Over 48 to 72 inches

A

B

A

B

A

B

A

B

A

B

*Structural Steel (Min. Tensile Strength 60,000 PSI)

1/2 inch or less

14,200 SFPM

1/16

1/16

3/32

3/32

1/8

1/8

3/16

3/16

1/4

1/4

1/2 inch or less

16,000 SFPM

3/32

1/8

1/8

1/8

3/16

1/8

1/4

3/16

5/16

1/4

*The recommendations listed in the above table are guides for the conditions stated. Other material, designs or dimensions affording equal or superior protection are also acceptable.

TABLE 8 DIMENSIONAL REQUIREMENTS FOR CONSTRUCTION OF FABRICATED GUARDS MAXIMUM WHEEL SPEED 10,000 SFPM
	A	B	C	D	E	F	G	H
Diameter of Wheel	Length of Tongue	Diameter of Bolts Medium Carbon Quenched & Tempered	Size of Angle Supports Tongue and Rest	Diameter of Rivets for Supports	Diameter of End Connecting Bolts	Thickness of Tongue	Maximum Space Between New Wheel and Guard at Periphery	Maximum Inside Width of Guard
Inches	Inches	Inches	Inches	Inches	Inches	Inches	Inches	Inches
Under 12	3 1/2	9/16	1 1/2 x 1 1/2 x 5/16	4 ea. @ 1/2	1/2	1/4	1 1/2	1 1/2 wider than wheel
16	5	5/8	2 x 2 x 5/16	4 ea. @ 5/8	9/16	5/16	1 1/2	2 wider than wheel
24	6	3/4	2 x 2 x 1/2	6 ea. @ 5/8	5/8	1/2	1 1/2	2 wider than wheel
30	7	11/16	2 1/2 x 2 1/2 x 1/2	6 ea. @ 11/16	11/16	1/2	1 1/2	2 wider than wheel
NOTE: Column D assumes low carbon steel (38,000 PSI tensile) rivets. Two rivets per bar 12 and 16” diameter. For rivets per bar 24 and 30” diameter.

TABLE 9 GUIDE FOR CONSTRUCTION OF BAND TYPE GUARDS Maximum Wheel Speed 7000 SFPM For Ring, Segment, Nut Inserted Wheels
Maximum Material Specifications	Diameter of Wheel	Minimum Thickness of Band A	Minimum Diameter of Rivets	Maximum Distance Between Centers of Rivets
	Inches	Inches	Inches	Inches
*Hot Rolled Steel SAE 1008	Under 8	1/16	3/16	3/4
	8 to 24	1/8	1/4	1
	Over 24 to 30	1/4	3/8	1 1/4
* The recommendations listed in the above table are guides for the conditions stated. Other material, designs or dimensions affording equal or superior protection are also acceptable.

TABLE 10 GUIDE FOR CONSTRUCTION OF BAND TYPE GUARDS EXPOSURE VERSUS WHEEL THICKNESS
Overall Thickness of Wheel (T) Inches	Maximum Exposure of Wheel (C) Inches
1/2	1/4
1	1/2
2	3/4
3	1
4	1 1/2
5 and over	2

TABLE 11 MINIMUM DIMENSIONS FOR STRAIGHT RELIEVED FLANGES
A*	B	C		D	E
Diameter of Wheel	**Minimum Outside Diameter of Flanges	Radial Width of Bearing Surface		Minimum Thickness of Flange at Bore	Minimum Thickness of Flange at Edge of Recess
		Minimum	Maximum
Inches	Inches	Inches	Inches	Inches	Inches
1	3/8	1/16	1/8	1/16	1/16
2	3/4	1/8	3/16	1/8	3/32
3	1	1/8	3/16	3/16	3/32
4	1 3/8	1/8	3/16	3/16	1/8
5	1 3/4	3/16	1/4	1/4	1/8
6	2	1/4	1/2	3/8	3/16
7	2 1/2	1/4	1/2	3/8	3/16
8	3	1/4	1/2	3/8	3/16
10	3 1/2	5/16	5/8	3/8	1/4
12	4	5/16	5/8	1/2	5/16
14	4 1/2	3/8	3/4	1/2	5/16
16	5 1/2	1/2	1	1/2	5/16
18	6	1/2	1	5/8	3/8
20	7	5/8	1 1/4	5/8	3/8
22	7 1/2	5/8	1 1/4	5/8	7/16
24	8	3/4	1 1/4	5/8	7/16
26	8 1/2	3/4	1 1/4	5/8	1/2
28	10	7/8	1 1/2	3/4	1/2
30	10	7/8	1 1/2	3/4	5/8
36	12	1	2	7/8	3/4
42	14	1	2	7/8	3/4
48	16	1 1/4	2	1 1/8	1
60	20	1 1/4	2	1 1/4	1 1/8
72	24	1 1/2	2 1/2	1 3/8	1 1/4
* Flanges for wheels under 2 inches diameter may be unrelieved and shall be maintained flat and true. ** See rule 141.

TABLE 12 MINIMUM DIMENSIONS FOR STRAIGHT UNRELIEVED FLANGES FOR WHEELS WITH THREADED INSERTS OR PROJECTING STUDS
A			B*	T
Diameter of Wheel			Minimum Outside Diameter of Flange	Minimum Thickness of Flange
Inches			Inches	Inches
1			5/8	1/8
2			1	1/8
3			1	3/16
4			1 3/8	3/16
5			1 3/4	1/4
6			2	3/8
* NOTE:		Must be large enough to extend beyond the bushing. Where prong anchor or cupback bushing are used, this footnote does not apply.

TABLE 13 MINIMUM DIMENSIONS FOR STRAIGHT ADAPTOR FLANGE FOR ORGANIC BONDED WHEELS OVER 1 1/4 INCH THICK
Wheel Diameter	Wheel Hole Diameter	B	D	E	F*
		Minimum Flange Diameter	Minimum Thickness of Flange at Bore	Minimum Thickness of Flange at Edge of Undercut	(D-E) Minimum Thickness
Inches	Inches	Inches	Inches	Inches	Inches
12 to 14	4	6	7/8	3/8	1/2
	5	7	7/8	3/8	1/2
	6	8	7/8	3/8	1/2
Larger than 14 to 18	4	6	7/8	3/8	1/2
	5	7	7/8	3/8	1/2
	6	8	7/8	3/8	1/2
	7	9	7/8	3/8	1/2
	8	10	7/8	3/8	1/2
Larger than 18 to 24	6	8	1	1/2	1/2
	7	9	1	1/2	1/2
	8	10	1	1/2	1/2
	10	12	1	1/2	1/2
	12	14	1	1/2	1/2
Larger than 24 to 30	12	15	1	1/2	1/2
Larger than 30 to 36	12	15	1 3/8	7/8	1/2
* For wheels under 1 1/4 inch thick F dimension shall not exceed 40% of wheel thickness.

TABLE 14 MINIMUM DIMENSIONS FOR STRAIGHT FLANGES FOR AUTOMATIC SNAG MACHINES 12,500 S.F.P.M. TO 16,500 S.F.P.M.1
Wheel Diameter	Wheel Hole Diameter	B	D	E	F*
		Minimum Flange Diameter	Minimum Thickness of Flange at Bore	Minimum Thickness of Flange at Edge of Undercut	(D-E) Minimum Thickness
20	6	8	1	1/2	1/2
20	8	10	1 1/2	3/4	3/4
24	12	15	1 1/2	3/4	3/4
30	12	15	1 1/2	3/4	3/4
36	12	15	1 1/2	3/4	3/4
1 FLANGES shall be of steel, quality SAE 1040 or equivalent, annealed plate, heat treated        to R c 25- 30. * For wheels under 1 1/4 inch thick F dimension shall not exceed 40% of wheel thickness.

TABLE 15 MINIMUM DIMENSIONS FOR STRAIGHT ADAPTOR FLANGE FOR ORGANIC BONDED WHEELS USED ON SWING FRAME GRINDERS AT 12,500 S.F.P.M. TO 16,500 S.F.P.M.1
Wheel Diameter	Wheel Hole Diameter	B	D	E	F*
		Minimum Flange Diameter	Minimum Thickness of Flange at Bore	Minimum Thickness of Flange at Edge of Undercut	(D-E) Minimum Thickness
20	6	8	1	1/2	1/2
20	8	10	1	1/2	1/2
24	12	15	1	1/2	1/2
30	12	15	1	1/2	1/2
1 FLANGES shall be of steel, quality SAE 1040 or equivalent, annealed plate, heat treated        to R c 25- 30. * For wheels under 1 1/4 inch thick F dimension shall not exceed 40% of wheel thickness.

TABLE 16 MINIMUM DIMENSIONS FOR STRAIGHT FLANGES FOR HEAVY DUTY, HIGH SPEED FLOOR STAND GRINDERS1 12,500 S.F.P.M. TO 16,5000 S.F.P.M.
Wheel Diameter	Hole Diameter	B	D
		Minimum Flange Diameter	Minimum Thickness of Flange at Bore
20	6 thru 10	8 thru 12	1
24	12	15	1
30	12	15	1
1 FLANGES shall be of steel, quality SAE 1040 or equivalent, annealed plate, heat treated        to R c 25- 30.

TABLE 17 MINIMUM DIMENSIONS FOR FLANGES FOR ARBORLESS WHEELS – ORGANIC BOND
Wheel Diameter	Bolt Circle	“B” Minimum Flange Diameter	Torque Used in Mounting Ft. Lbs.	Minimum Hole Size Dimensions. (8 holes) (holes equally spaced)
16	6 1/2	8 7/8	30-40	All mounting holes shall be 17/32” inside diameter, with a fiber bushing in place, not to exceed 21/32” outside diameter.
20	8	10 3/8	30-40
24	9 5/8	12	40-60
30	12	14 3/8	40-60

TABLE 18 MINIMUM DIMENSIONS FOR STRAIGHT FLANGES USED AS WHEEL SLEEVES FOR PRECISION GRINDING ONLY
Wheel Diameter	Wheel Hole Diameter	B	D	E
		Minimum Outside Diameter of Flange	Minimum Thickness of Flange at Bore	Minimum Thickness of Flange at Edge of Undercut
Inches	Inches	Inches	Inches	Inches
12 to 14	5	7	1/2	7/16
Larger than 14 to 20	5	7	5/8	7/16
	6	8	5/8	7/16
	8	10	5/8	7/16
	10	11 1/2	5/8	7/16
	12	13 1/2	5/8	7/16
Larger than 20 to 30	8	10	3/4	1/2
	10	11 1/2	3/4	1/2
	12	13 1/2	3/4	1/2
	16	17 1/2	3/4	1/2
Larger than 30 to 42	12	13 1/2	3/4	1/2
	16	17 1/2	3/4	1/2
	18	19 1/2	3/4	1/2
	20	21 1/2	3/4	1/2
Larger than 42 to 60	16	20	1	3/4
	20	24	1	3/4
	24	29	1 1/8	7/8
Note: These flanges may be clamped together by means of a central nut, or by a series of bolts or some other equivalent means of fastening. For hole sizes smaller than shown in this table, use table 9.

TABLE 19 MINIMUM THICKNESS OF STEEL DISC WHEELS (MACHINE FACE PLATE) FOR MOUNTING ABRASIVE DISCS
Diameter Inches	Minimum Thickness Inches
8 to 14 inclusive	1/2
15 to 18 inclusive	5/8
19 to 26 inclusive	3/4
27 to 36 inclusive	7/8
37 to 40 inclusive	1
41 to 72 inclusive	1 1/8

TABLE 20 MINIMUM THICKNESS OF STEEL DISC WHEELS FOR MACHINES USING PLATE MOUNTED WHEELS HAVING THIN MOUNTING PLATES
Abrasive Disc Diameter D (Inches)	Minimum Thickness Pt (Inches)
12 and smaller	3/8
14 to 16 inclusive	1/2
17 to 18 inclusive	5/8
19 to 26 inclusive	3/4
27 to 36 inclusive	7/8

TABLE 21 STANDARD MAXIMUM SPEEDS IN SURFACE FEET PER MINUTE
Classification Number	Types of Wheels (See Section 1 for Definitions)	Inorganic Bonds		Organic Bonds
		Low Strength	Medium Strength	High Strength	Low Strength	Medium Strength	High Strength
		OPERATING SPEED SHALL NOT EXCEED:
		SFPM	SFPM	SFPM	SFPM	SFPM	SFPM
1	Type 1 – Straight Wheels – except classifications 6, 7, 9, 10, 11, 12 and 13 below	5,500	6,000	6,500	6,500	8,000	9,500
	Type 4* – Taper Side Wheels
	Types 5, 7, 20, 21, 22, 23, 24, 25, 26 Recessed, Dovetailed and/or relieved wheels. (Except Classification 7 below)
	Type 12 – Dish Wheels
	Type 13 – Saucer Wheels
	Types 16, 17, 18, 19 – Cones and Plugs
2	Type 2 – Cylinder Wheels including plate mounted, inserted nut and projecting stud – Segments	5,000	5,500	6,000	5,000	6,000	7,000
3	Cup Shape Tool Grinding Wheels (For Fixed Base Machines) Type 6 – Straight Side Cups Type 11 – Flaring Cups	4,500	5,000	6,000	6,000	7,500	8,500
4	Cup Shape Snagging Wheels (For Portable Machines) Type 6 – Straight Side Cups Type 11 – Flaring Cups	4,500	5,500	6,500	6,000	8,000	9,500
5	Abrasive Discs: Plate Mounted Inserted Nut and Projecting Stud: Solid or Segmented	5,500	6,000	6,500	5,500	7,000	8,500
6†	Reinforced Wheels Type 1 Max. Dia. 4” Max. Thickness 1/4"	X	X	X	9,500	12,500	16,000
	Max. Dia. 10” Max. Thickness 1/2"	X	X	X	9,500	12,500	14,200

TABLE 21 STANDARD MAXIMUM SPEEDS IN SURFACE FEET PER MINUTE
Classification Number	Types of Wheels (See Section 1 for Definitions)	Inorganic Bonds		Organic Bonds
		Low Strength	Medium Strength	High Strength	Low Strength	Medium Strength	High Strength
		OPERATING SPEED SHALL NOT EXCEED:
		SFPM	SFPM	SFPM	SFPM	SFPM	SFPM
	All Other Dias. and Thicknesses	X	X	X	9,500	12,500	12,500
	Reinforced Wheels – Types 27 and 28 Max. Dia. 9” Max. Thickness 3/8”	X	X	X	9,500	12,500	14,200
	Max. Dia. 9” – Over 3/8” Thick	X	X	X	X	9,500	11,000
7	Type 1 Wheels for Bench and Pedestal Grinders and Types 1 and 5 Surface Grinders in following sizes only. 7” dia. up to 2” thick and up to 2” hole	5,500	6,325	6,600	6,500	8,000	9,500
	8” dia. up to 2” thick and up to 2” hole	5,500	6,325	7,550	6,500	8,000	9,500
8	Diamond Wheels Cutting-Off – IAI, IAIR, IAIRS**	X	X	16,000	X	X	16,000
	Metal Bond	X	X	12,000	X	X	X
	Resin Bond	X	X	X	X	X	9,500
	Vitrified Bond	X	X	6,500	X	X	X
9	Cutting Off Wheels Type 1 and 27A Larger than 16” dia., Including Reinforced Organic	X	X	X	9,500	12,000	14,200
10	Cutting-Off Wheels Type 1 and 27A 16” dia., and smaller – Including Reinforced Organic	X	X	X	9,500	12,000	16,000
11	Thread and Flute Grinding Wheels	8,000	10,000	12,000	8,000	10,000	12,000
12	Crankshaft and Camshaft Grinding Wheels	5,500	8,000	8,500	6,500	8,000	9,500
13	Type 1 Snagging Wheels 16” dia. and Larger, Organic Bond, Non Reinforced Used on Specifically Designed Swing Frame and Mechanical Grinders	X	X	X	X	X	12,500
14	Internal Wheels – Type 1 and 5 Maximum dia. 6”	5,500	8,000	8,500	6,500	8,500	9,500
* Non-standard Shape. † Classification 6 excludes cut-off wheels. ** Standard Diamond Wheel Shapes.

TABLE 22 WHEEL MANUFACUTERS TESTING SPEEDS
Class of Wheel	Operating Speed Surface Feet Per Minute	Minimum Test Factor*
Cutting-off Wheels	All speeds	1.20
All Bonds and Wheel Types (Except Cutting-off Wheels)	Up to 5,000	1.25
All Bonds and Wheel Types (Except Cutting-off wheels)	Faster than 5,000	1.50
* Actual operating speed shall be multiplied by this test factor to establish minimum speed at which wheels shall be tested by the wheel manufacturer.

TABLE 23 GROUP W – (PLAIN WHEELS) MAXIMUM OPERATING SPEEDS (RPM) FOR 3/32” MANDRELS
Shape No.	Wheel Diameter Inches	Wheel Thickness Inches	1/2" Overhang & Thd. Mdls.	Overhang – Dimension O
				1”	1 1/2"	2”	2 1/2"
W 141	3/32	5/32	93,750	53,250	37,500	25,500	16,500
W 142	3/32	1/4	93,750	53,250	37,500	25,500	16,500
W 143	1/8	1/8	93,750	53,250	37,500	25,500	16,500
W 144	1/8	1/4	93,750	53,250	37,500	25,500	16,500
W 145	1/8	3/8	88,500	49,500	35,250	24,000	15,750
W 146	1/8	1/2	81,000	43,750	31,500	22,500	15,000
W 147	5/32	1/32	93,750	53,250	37,500	25,500	16,500
W 148	5/32	1/16	93,750	53,250	37,500	25,500	16,500
W 149	5/32	1/4	90,750	50,250	36,000	24,750	15,750
W 150	3/16	1/16	93,750	53,250	37,500	25,500	16,500
W 151	3/16	1/8	93,750	53,250	37,500	25,500	16,500
W 152	3/16	1/4	83,250	47,250	33,000	23,250	15,000
W 153	3/16	3/8	73,500	42,000	28,500	21,000	13,500
W 154	3/16	1/2	66,000	38,250	25,500	18,750	12,750
W 155	13/64	1/4	78,000	44,250	30,750	21,750	14,250
W 156	1/4	1/32	93,750	53,250	37,500	25,500	16,500
W 157	1/4	1/16	93,750	53,250	37,500	25,500	16,500
W 158	1/4	1/8	93,750	53,250	37,500	25,500	16,500
W 159	1/4	3/16	78,000	44,250	30,750	21,750	14,250
W 160	1/4	1/4	69,000	42,000	27,750	18,750	13,500
W 161	1/4	5/16	66,000	39,750	24,750	17,250	12,750
W 162	1/4	3/8	57,000	34,500	23,250	16,500	11,250
W 165	5/16	1/16	93,000	51,750	37,500	25,500	16,500
W 166	5/16	1/8	84,750	48,750	28,500	19,500	14,250
W 167	5/16	1/4	61,500	39,000	24,750	18,000	12,000
W 168	5/16	5/16	56,250	33,750	22,500	16,500	12,000
W 169	5/16	3/8	48,000	28,500	20,250	15,000	11,250
W 170	5/16	1/2	39,750	26,250	16,500	12,750	9,750
W 171	5/16	3/4	27,750	19,500	13,500	10,500	8,250
W 172	3/8	1/16	85,500	48,750	33,750	24,000	15,000
W 173	3/8	1/8	71,250	46,500	30,000	19,500	12,750
W 174	3/8	1/4	54,000	32,250	21,000	15,000	10,500
W 175	3/8	3/8	41,250	24,000	18,000	12,750	9,750
W 176	3/8	1/2	33,750	21,000	15,750	12,000	9,000

TABLE 24 GROUP W – (PLAIN WHEELS) MAXIMUM OPERATING SPEEDS (RPM) FOR 1/8” MANDRELS
Shape No.	Wheel Diameter Inches	Wheel Thickness Inches	1/2" Overhang & Thd. Mdls.	Overhang – Dimension O
				1”	1 1/2"	2”	2 1/2"
W 143	1/8	1/8	105,000	64,500	46,650	32,400	21,370
W 144	1/8	1/4	105,000	64,500	46,650	32,400	21,370
W 145	1/8	3/8	105,000	64,500	46,650	32,400	21,370
W 146	1/8	1/2	105,000	64,500	46,650	32,400	21,370
W 151	5/16	1/8	105,000	64,500	46,650	32,400	21,370
W 152	3/16	1/4	105,000	64,500	46,650	32,400	21,370
W 153	3/16	3/8	80,850	52,500	37,500	26,250	17,620
W 154	3/16	1/2	70,500	46,500	31,500	21,970	15,220
W 157	1/4	1/16	123,000	65,525	47,770	33,150	21,750
W 158	1/4	1/8	105,000	64,500	46,650	32,400	21,370
W 159	1/4	3/16	92,400	57,370	39,370	27,900	18,900
W 160	1/4	1/4	81,370	51,000	34,120	24,000	16,870
W 161	1/4	5/16	77,250	45,970	30,900	22,500	16,120
W 162	1/4	3/8	68,400	42,370	28,870	20,850	15,000
W 163	1/4	1/2	60,000	38,020	26,250	18,750	13,870
W 164	1/4	3/4	45,900	30,000	21,750	15,900	11,850
W 165	5/16	1/16	107,400	62,470	41,250	29,250	20,250
W 166	5/16	1/8	96,970	57,000	35,620	25,120	18,000
W 167	5/16	1/4	75,000	47,570	31,120	22,500	15,750
W 168	5/16	5/16	68,400	41,770	28,650	21,000	15,000
W 169	5/16	3/8	61,650	37,720	27,000	19,870	14,250
W 170	5/16	1/2	52,500	33,000	23,020	16,650	12,600
W 171	5/16	3/4	37,120	25,500	18,750	14,620	10,020
W 172	3/8	1/16	99,370	59,250	41,020	29,250	20,250
W 173	3/8	1/8	87,600	53,250	35,250	24,750	17,250
W 174	3/8	1/4	69,000	41,250	27,750	20,400	15,000
W 175	3/8	3/8	54,000	33,000	24,150	18,000	13,500
W 176	3/8	1/2	45,370	28,500	21,000	15,900	12,150
W 177	3/8	3/4	33,750	23,250	17,620	13,650	10,350
W 178	3/8	1	26,250	18,750	14,250	10,870	8,250
W 181	1/2	1/16	76,390	55,500	36,750	25,500	17,850
W 182	1/2	1/8	73,500	43,650	29,100	20,770	15,450
W 183	1/2	1/4	51,750	31,870	22,500	17,250	12,900
W 184	1/2	3/8	41,020	26,400	19,500	15,000	11,400
W 185	1/2	1/2	34,500	22,500	16,870	13,120	9,900
W 186	1/2	3/4	26,250	17,400	12,750	9,750	8,020
W 187	1/2	1	20,620	13,870	10,120	7,870	6,370

TABLE 24 GROUP W – (PLAIN WHEELS) MAXIMUM OPERATING SPEEDS (RPM) FOR 1/8” MANDRELS
Shape No.	Wheel Diameter Inches	Wheel Thickness Inches	1/2" Overhang & Thd. Mdls.	Overhang – Dimension O
				1”	1 1/2"	2”	2 1/2"
W 190	5/8	1/16	61,120	48,000	31,500	22,650	16,870
W 191	5/8	1/8	58,870	34,500	25,120	18,900	14,250
W 192	5/8	1/4	43,120	27,370	19,870	15,220	11,620
W 193	5/8	3/8	32,250	23,020	16,500	12,520	9,750
W 194	5/8	1/2	29,400	19,120	13,500	10,500	8,250
W 195	5/8	3/4	22,120	14,250	10,120	7,650	6,150
W 196	5/8	1	17,620	11,620	8,100	6,150	5,100
W 199	3/4	1/16	50,930	44,770	30,000	21,750	15,750
W 200	3/4	1/8	50,930	33,520	23,850	17,850	13,350
W 201	3/4	1/4	38,250	24,370	17,400	13,270	9,970
W 202	3/4	3/8	30,600	19,500	13,500	10,120	7,800
W 203	3/4	1/2	25,500	15,900	10,870	8,250	6,600
W 204	3/4	3/4	18,900	12,000	8,400	6,220	5,250
W 210	7/8	1/16	43,650	35,250	25,720	18,900	14,320
W 211	7/8	1/8	43,650	27,900	20,400	15,820	12,220
W 212	7/8	1/4	33, 750	20,400	14,400	11,020	9,000
W 213	7/8	3/8	27,000	16,870	11,250	8,250	6,600
W 215	1	1/8	38,200	24,900	18,000	13,870	10,500
W 216	1	1/4	30,520	18,600	12,750	9,520	7,500

TABLE 25 GROUP W – (PLAIN WHEELS) MAXIMUM OPERATING SPEEDS (RPM) FOR 3/16” MANDRELS
Shape No.	Wheel Diameter Inches	Wheel Thickness Inches	1/2" Overhang   & Thd. Mdls	Overhang – Dimension O
				1”	1 1/2"	2”	2 1/2"
W 158	1/4	1/8	121,500	66,750	48,000	36,000	26,250
W 159	1/4	3/16	112,500	63,000	47,250	34,650	25,120
W 160	1/4	1/4	103,500	60,000	44,250	33,000	24,000
W 161	1/4	5/16	93,750	58,120	42,750	31,870	22,500
W 162	1/4	3/8	89,250	56,250	41,250	30,000	21,750
W 163	1/4	1/2	78,750	52,500	39,000	28,870	20,620
W 164	1/4	3/4	62,250	39,750	30,000	23,250	16,500
W 166	5/16	1/8	118,500	65,250	47,250	35,250	25,500
W 167	5/16	1/4	100,500	58,500	43,500	35,620	23,250
W 168	5/16	5/16	93,000	57,000	42,000	30,750	22,120
W 169	5/16	3/8	87,370	55,350	40,870	28,880	21,000
W 170	5/16	1/2	76,500	47,250	34,500	25,500	18,750
W 171	5/16	3/4	57,000	37,500	27,750	21,750	15,750
W 173	3/8	1/8	101,900	65,250	46,500	34,500	24,750
W 174	3/8	1/4	98,850	57,750	42,750	32,250	23,250
W 175	3/8	3/8	81,750	50,620	36,750	27,750	20,250
W 176	3/8	1/2	66,750	43,120	31,350	23,620	17,400
W 177	3/8	3/4	54,000	36,000	26,250	20,250	15,000
W 178	3/8	1	42,000	29,250	22,500	17,250	12,900
W 182	1/2	1/8	76,390	56,250	39,870	29,250	21,750
W 183	1/2	1/4	75,000	47,400	33,370	24,900	18,750
W 184	1/2	3/8	57,750	39,750	29,250	21,750	15,750
W 185	1/2	1/2	49,870	33,750	25,500	19,500	14,620
W 186	1/2	3/4	39,000	28,120	21,370	15,750	12,000
W 187	1/2	1	32,250	23,250	18,370	13,500	10,500
W 188	1/2	1 1/2	22,870	17,620	13,870	11,250	----
W 189	1/2	2	17,250	13,500	10,500	8,620	----
W 191	5/8	1/8	61,120	51,370	36,370	27,000	20,250
W 192	5/8	1/4	61,120	43,500	30,750	23,400	18,000
W 193	5/8	3/8	52,500	34,870	25,500	18,750	15,000
W 194	5/8	1/2	44,400	31,120	23,400	18,000	13,500
W 195	5/8	3/4	34,500	24,000	18,370	14,250	10,500
W 196	5/8	1	25,870	18,900	15,000	11,620	9,370
W 197	5/8	2	14,770	11,770	8,700	7,270	----
W 200	3/4	1/8	50,930	48,750	33,750	25,500	19,500
W 201	3/4	1/4	50,930	37,500	27,900	21,370	16,500
W 202	3/4	3/8	45,750	31,500	24,370	18,000	13,870

TABLE 25 GROUP W – (PLAIN WHEELS) MAXIMUM OPERATING SPEEDS (RPM) FOR 3/16” MANDRELS
Shape No.	Wheel Diameter Inches	Wheel Thickness Inches	1/2" Overhang   & Thd. Mdls	Overhang – Dimension O
				1”	1 1/2"	2”	2 1/2"
W 203	3/4	1/2	39,750	27,370	20,620	15,900	12,000
W 204	3/4	3/4	29,250	20,250	15,000	12,000	9,370
W 205	3/4	1	24,750	17,250	12,750	10,500	8,620
W 206	3/4	1 1/4	19,500	14,250	11,620	9,000	6,750
W 207	3/4	1 1/2	16,500	12,370	9,750	7,870	----
W 208	3/4	2	12,750	9,370	7,500	6,000	----
W 211	7/8	1/8	43,650	43,650	31,870	24,000	18,370
W 212	7/8	1/4	43,650	34,500	25,870	19,870	14,620
W 213	7/8	3/8	42,370	28,120	21,370	16,500	12,370
W 215	1	1/8	38,200	38,200	31,120	23,620	18,000
W 216	1	1/4	38,200	33,750	24,750	19,120	14,250
W 217	1	3/8	38,200	27,000	19,870	15,750	12,000
W 218	1	1/2	32,700	22,120	16,870	12,900	10,350
W 219	1	3/4	25,120	17,620	12,900	9,900	8,400
W 220	1	1	19,500	14,250	11,250	8,620	7,120
W 221	1	1 1/2	13,120	9,370	7,120	6,000	----
W 222	1	2	9,000	7,120	5,620	4,870	----
W 225	1 1/4	1/4	30,560	28,870	21,220	16,270	12,300
W 226	1 1/4	3/8	30,560	22,120	16,350	12,750	10,270
W 227	1 1/4	1/2	27,750	19,120	13,950	10,650	8,700
W 228	1 1/4	3/4	20,620	14,620	11,020	8,770	7,120
W 229	1 1/4	1	16,500	12,000	8,620	6,900	5,770
W 230	1 1/4	1 1/4	13,270	9,150	6,970	5,700	----
W 231	1 1/4	1 1/2	10,270	7,270	6,000	5,100	----
W 232	1 1/4	2	7,500	6,000	4,870	4,500	----
W 235	1 1/2	1/4	25,470	24,900	18,900	15,150	11,770
W 236	1 1/2	1/2	25,470	18,750	13,870	10,500	8,620
W 237	1 1/2	1	15,750	11,250	7,870	6,370	5,620
W 238	1 1/2	1 1/2	9,900	6,970	5,470	4,870	----

TABLE 26 GROUP W – (PLAIN WHEELS) MAXIMUM OPERATING SPEEDS (RPM) FOR 1/4” MANDRELS
Shape No.	Wheel Diameter Inches	Wheel Thickness Inches	1/2" Overhang & Thd. Mdls	Overhang – Dimension O
				1”	1 1/2"	2”	2 1/2"	3”	4”	5”
W 176	3/8	1/2	81,000	54,379	42,000	33,000	25,500	20,400	13,260	9,550
W 177	3/8	3/4	66,000	46,500	32,250	27,370	21,000	16,800	10,920	7,860
W 178	3/8	1	55,200	40,500	30,000	23,250	17,250	13,800	8,970	6,460
W 179	3/8	1 1/4	45,750	33,750	25,720	19,720	15,300	12,240	7,960	5,730
W 182	1/2	1/8	76,390	62,400	45,750	35,400	27,250	22,020	14,310	10,300
W 183	1/2	1/4	76,390	54,750	40,500	31,120	24,000	19,200	12,480	8,990
W 184	1/2	3/8	71,250	47,620	35,020	27,000	20,850	16,680	10,840	7,800
W 185	1/2	1/2	61,500	42,000	31,500	24,000	18,370	14,700	9,560	6,880
W 186	1/2	3/4	51,000	36,370	27,750	21,220	16,120	12,900	8,390	6,040
W 187	1/2	1	40,500	30,000	24,000	18,750	14,250	11,400	7,410	5,340
W 188	1/2	1 1/2	30,370	24,000	18,900	15,000	12,000	9,600	6,240	4,490
W 189	1/2	2	24,000	18,750	15,000	12,150	9,900	7,920	5,150	3,710
W 190	5/8	1/16	61,120	61,120	48,000	31,500	29,020	23,220	15,090	10,800
W 191	5/8	1/8	61,120	60,000	44,250	34,500	27,000	21,600	14,040	10,110
W 192	5/8	1/4	61,120	51,750	38,400	29,770	23,250	18,680	12,140	8,740
W 193	5/8	3/8	61,120	45,500	33,370	25,870	20,100	16,080	10,450	7,520
W 194	5/8	1/2	56,400	39,750	29,400	22,720	17,400	13,920	9,050	6,520
W 195	5/8	3/4	46,500	32,400	24,900	19,720	15,370	12,300	8,000	5,760
W 196	5/8	1	35,250	27,000	21,300	16,870	13,120	10,500	6,830	4,920
W 197	5/8	2	21,000	16,500	12,900	10,870	8,700	6,960	4,520	3,250
W 198	5/8	2 1/2	16,500	12,900	10,870	8,700	7,000	5,600	3,640	2,620
W 201	3/4	1/4	50,930	50,930	38,100	29,020	22,500	18,000	11,700	8,420
W 202	3/4	3/8	50,930	44,100	32,400	25,120	19,350	15,480	10,060	7,240
W 203	3/4	1/2	50,930	36,370	27,750	21,750	16,870	13,500	8,780	6,320
W 204	3/4	3/4	42,750	30,750	23,250	18,000	14,020	11,220	7,290	5,250
W 205	3/4	1	34,500	25,870	19,500	15,000	12,000	9,600	6,240	4,490
W 206	3/4	1 1/4	28,720	21,520	17,020	13,500	10,800	8,640	5,620	4,050
W 207	3/4	1 1/2	24,000	18,520	14,620	12,000	9,900	7,920	5,150	3,710
W 208	3/4	2	18,750	15,370	12,000	9,900	8,000	6,400	4,160	3,000
W 209	3/4	2 1/2	15,000	12,150	10,500	8,400	6,800	5,440	3,540	2,550
W 211	7/8	1/8	43,650	43,650	42,900	33,000	26,250	21,000	13,650	9,820
W 212	7/8	1/4	43,650	43,650	35,100	27,600	21,370	17,100	11,120	8,010
W 213	7/8	3/8	43,650	40,870	29,400	23,400	18,370	14,700	9,560	6,880
W 215	1	1/8	38,200	38,200	38,200	33,750	25,500	20,400	13,260	9,550
W 216	1	1/4	38,200	38,200	33,750	26,250	20,250	16,200	10,530	7,580
W 217	1	3/8	38,200	38,200	28,500	22,500	17,400	13,920	9,050	6,520
W 218	1	1/2	38,200	32,770	24,900	19,500	14,850	11,880	7,720	5,560

TABLE 26 GROUP W – (PLAIN WHEELS) MAXIMUM OPERATING SPEEDS (RPM) FOR 1/4” MANDRELS
Shape No.	Wheel Diameter Inches	Wheel Thickness Inches	1/2" Overhang & Thd. Mdls	Overhang – Dimension O
				1”	1 1/2"	2”	2 1/2"	3”	4”	5”
W 219	1	3/4	35,100	24,520	18,750	15,000	12,000	9,600	6,240	4,490
W 220	1	1	25,500	19,120	15,750	12,370	10,500	8,400	5,460	3,930
W 221	1	1 1/2	19,120	14,620	12,000	10,500	8,400	6,720	4,370	3,150
W 222	1	2	15,900	12,370	9,750	8,620	6,900	5,520	3,590	2,580
W 223	1	2 1/2	12,370	9,900	8,620	6,900	5,500	4,400	2,860	2,060
W 225	1 1/4	1/4	30,560	30,560	30,560	24,000	18,750	15,000	9,750	7,020
W 226	1 1/4	3/8	30,560	30,560	26,250	20,100	15,750	12,600	8,190	5,900
W 227	1 1/4	1/2	30,560	29,620	22,650	18,000	14,100	11,280	7,330	5,280
W 228	1 1/4	3/4	30,520	22,500	17,850	14,250	11,400	9,120	5,930	4,270
W 229	1 1/4	1	24,000	18,750	15,370	12,000	9,900	7,920	5,150	3,710
W 230	1 1/4	1 1/4	20,400	15,900	12,750	10,500	8,400	6,720	4,370	3,150
W 231	1 1/4	1 1/2	17,620	13,500	10,650	9,000	7,200	5,760	3,740	2,690
W 232	1 1/4	2	14,250	10,650	9,000	7,500	6,000	4,800	3,120	2,250
W 235	1 1/2	1/4	25,470	25,470	25,470	22,720	17,620	14,100	9,170	6,600
W 236	1 1/2	1/2	25,470	25,470	21,750	17,250	13,650	10,920	7,100	5,110
W 237	1 1/2	1	22,500	17,620	13,270	10,870	9,520	7,620	4,950	3,560
W 238	1 1/2	1 1/2	15,600	12,000	9,750	8,250	6,600	5,280	3,430	2,470
W 239	1 1/2	2	12,750	9,900	8,000	6,400	5,100	4,080	2,650	1,910
W 240	1 1/2	2 1/2	10,500	8,400	6,800	5,500	4,400	3,520	2,290	1,650
W 241	1 1/2	3	9,000	7,250	6,000	4,800	3,900	3,120	2,030	1,460
W 242	2	1	19,100	15,950	11,750	10,000	8,800	7,040	4,580	3,300
W 243	2	1 1/2	14,500	12,750	9,800	7,800	6,300	5,040	3,280	2,360
W 244	2	2	11,750	10,500	7,500	6,200	5,030	4,000	2,600	1,870
W 245	2	2 1/2	9,600	7,250	6,400	5,300	4,250	3,400	2,210	1,590
W 246	2	3	8,250	6,750	5,600	4,600	3,700	2,960	1,920	1,380

TABLE 27 GROUP W – (PLAIN WHEELS) MAXIMUM OPERATING SPEEDS (RPM) FOR 3/8” MANDRELS
Shape No.	Wheel Diameter Inches	Wheel Thickness Inches	1/2" Overhang & Thd. Mdls	Overhang – Dimension O
				1”	1 1/2"	2”	2 1/2"	3”	4”	5”
W 185	1/2	1/2	76,390	76,390	63,000	48,000	36,740	29,400	19,120	13,760
W 186	1/2	3/4	76,390	72,740	55,500	42,440	32,240	25,800	16,780	12,080
W 187	1/2	1	76,390	60,000	48,000	37,500	28,500	22,800	14,820	10,680
W 188	1/2	1 1/2	60,740	48,000	37,800	30,000	24,000	19,200	12,480	8.980
W 189	1/2	2	48,000	37,500	30,000	24,300	19,800	15,840	10,300	7,420
W 194	5/8	1/2	61,120	61,120	58,880	45,440	34,800	27,840	18,100	13,040
W 195	5/8	3/4	61,120	61,120	49,800	39,440	30,740	24,600	16,000	11,520
W 196	5/8	1	61,120	54,000	42,600	33,740	26,240	21,000	13,660	9,840
W 197	5/8	2	42,000	33,000	25,800	21,740	17,400	13,970	9,040	6,500
W 198	5/8	2 1/2	33,000	25,800	21,740	17,400	14,000	11,200	7,280	5,240
W 203	3/4	1/2	50,930	50,930	50,930	43,500	33,740	27,000	17,560	12,640
W 204	3/4	3/4	50,930	50,930	46,500	36,000	28,040	22,440	14,580	10,500
W 205	3/4	1	50,930	50,930	39,000	30,000	24,000	19,200	12,480	8,980
W 206	3/4	1 1/4	50,930	43,040	34,040	27,000	21,600	17,280	11,240	8,100
W 207	3/4	1 1/2	48,000	37,040	29,240	24,000	19,800	15,840	10,300	7,420
W 208	3/4	2	37,500	30,740	24,000	19,800	16,000	12,800	8,320	6,000
W 209	3/4	2 1/2	30,000	24,300	21,000	16,800	13,600	10,880	7,080	5,100
W 218	1	1/2	38,200	38,200	38,200	38,200	29,700	23,760	15,440	11,120
W 219	1	3/4	38,200	38,200	37,500	30,000	24,000	19,200	12,480	8,980
W 220	1	1	38,200	38,200	31,500	24,740	21,000	16,800	10,920	7,860
W 221	1	1 1/2	38,200	29,240	24,000	21,000	16,800	13,440	8,740	6,300
W 222	1	2	31,800	24,740	19,500	17,240	13,800	11,040	7,180	5,160
W 223	1	2 1/2	24,740	19,800	17,240	13,800	11,000	8,800	5,720	4,120
W 227	1 1/4	1/2	30,560	30,560	30,560	30,560	28,200	22,560	14,660	10,560
W 228	1 1/4	3/4	30,560	30,560	30,560	28,500	22,800	18,240	11,860	8,540
W 229	1 1/4	1	30,560	30,560	30,560	24,000	19,800	15,840	10,300	7,420
W 230	1 1/4	1 1/4	30,560	30,560	25,500	21,000	16,800	13,440	8,740	6,300
W 231	1 1/4	1 1/2	30,560	27,000	21,300	18,000	14,400	11,520	7,480	5,380
W 232	1 1/4	2	28,500	21,300	18,000	15,000	12,000	9,600	6,240	4,500
W 236	1 1/2	1/2	25,470	25,470	25,470	25,470	25,470	21,840	14,200	10,220
W 237	1 1/2	1	25,470	25,470	25,470	21,470	19,040	15,240	9,900	7,120
W 238	1 1/2	1 1/2	25,470	24,000	19,500	16,500	13,200	10,560	6,860	4,940
W 239	1 1/2	2	25,470	19,800	16,000	12,800	10,200	8,160	5,300	3,820
W 240	1 1/2	2 1/2	21,000	16,800	13,600	11,000	8,800	7,040	4,580	3,300
W 241	1 1/2	3	18,000	14,500	12,000	9,600	7,800	6,240	4,060	2,920
W 242	2	1	19,100	19,100	19,100	19,100	17,600	14,080	9,160	6,600
W 243	2	1 1/2	19,100	19,100	19,100	15,600	12,600	10,080	6,560	4,720

W 244	2	2	19,100	19,100	15,000	12,400	10,000	8,000	5,200	3,740
W 245	2	2 1/2	19,100	14,500	12,800	10,600	8,500	6,800	4,420	3,180
W 246	2	3	16,500	13,500	11,200	9,200	7,400	5,920	3,840	2,760

TABLE 28 GROUP B – (SHAPED WHEELS) MAXIMUM OPERATING SPEEDS (RPM) FOR 3/32” MANDRELS
Shape No.	Wheel Diameter Inches	Wheel Thickness Inches	1/2" Overhang & Thd. Mdls.	Overhang – Dimension O
				1”	1 1/2"	2”	2 1/2"
B 43	1/4	5/16	67,500	41,250	27,000	18,750	12,750
B 44	7/32	3/8	57,000	34,500	22,500	16,500	11,250
B 45	3/16	5/16	86,250	50,250	35,250	24,000	15,000
B 46	1/8	5/16	87,000	52,500	36,750	24,750	16,500
B 47	1/8	5/32	87,000	52,500	36,750	24,750	16,500
B 53	1/4	5/8	49,500	30,750	20,250	14,250	10,500
B 55	1/8	1/4	87,000	52,500	36,750	24,750	16,500
B 63	1/4	3/16	76,500	46,500	30,750	21,750	14,250
B 64	1/4	1/16	87,000	52,500	36,750	24,750	16,500
B 65	1/8	1/8	87,000	52,500	36,750	24,750	16,500
B 70	3/4	1/8	50,930	33,750	21,750	15,750	11,250
B 71	5/8	1/8	61,120	39,000	24,750	17,250	12,750
B 72	1/2	1/8	60,750	35,250	23,250	16,500	12,000
B 73	1/2	1/8	60,750	35,250	23,250	16,500	12,000
B 74	7/32	3/32	87,000	52,500	36,750	24,750	16,500
B 81	3/4	3/16	50,930	33,750	21,750	15,750	11,250
B 82	1/2	1/4	67,500	41,250	27,000	18,750	12,750
B 83	3/8	3/16	72,750	43,500	27,750	19,500	12,750
B 84	5/16	3/16	87,000	52,500	36,750	24,750	16,500
B 92	1/4	1/4	67,500	41,250	27,000	18,750	12,750
B 93	3/16	3/16	87,000	52,500	36,750	24,750	16,500
B 94	11/64	3/32	87,000	52,500	36,750	24,750	16,500
B 95	1/8	3/16	87,000	52,500	36,750	24,750	16,500
B 96	1/8	1/4	87,000	52,500	36,750	24,750	16,500
B 97	1/8	3/8	87,000	52,500	36,750	24,750	16,500
B 98	3/32	1/4	87,000	52,500	36,750	24,750	16,500
B 104	5/16	3/8	57,000	34,500	22,500	16,500	11,250
B 105	1/4	1/4	86,250	50,250	35,250	24,000	15,000
B 106	1/8	7/64	87,000	52,500	36,750	24,750	16,500
B 112	3/8	1/2	37,500	23,250	16,500	12,750	9,000
B 113	1/4	1/4	67,500	41,250	27,000	18,750	12,750
B 114	7/32	3/8	57,000	34,500	22,500	16,500	11,250
B 115	3/32	1/8	87,000	52,500	36,750	24,750	16,500
B 122	3/8	3/8	51,000	30,750	21,000	15,000	10,500
B 123	3/16	3/16	86,250	50,250	35,250	24,000	15,000
B 124	1/8	1/8	87,000	52,500	36,750	24,750	16,500

TABLE 29 GROUP B – (SHAPED WHEELS) MAXIMUM OPERATING SPEEDS (RPM) FOR 1/8” MANDRELS
Shape No.	Wheel Diameter Inches	Wheel Thickness Inches	1/2" Overhang & Thd. Mdls.	Overhang – Dimension O
				1”	1 1/2"	2”	2 1/2"
B 41	5/8	5/8	33,750	23,250	17,620	13,650	10,350
B 42	½	3/4	33,750	23,250	17,620	13,650	10,350
B 43	¼	5/16	81,370	51,000	34,120	24,000	16,870
B 44	7/32	3/8	68,400	42,370	28,870	20,850	15,000
B 45	3/16	5/16	104,250	61,870	44,620	30,900	20,250
B 46	1/8	5/16	105,000	64,500	46,650	32,400	21,370
B 47	1/8	5/32	105,000	64,500	46,650	32,400	21,370
B 51	7/16	3/4	45,370	28,500	21,000	15,900	12,150
B 52	3/8	3/4	43,370	28,500	21,000	15,900	12,150
B 53	¼	5/8	60,000	38,020	26,250	18,750	13,870
B 54	¼	1/2	60,000	38,020	26,250	18,750	13,870
B 55	1/8	1/4	105,000	64,500	46,550	32,400	21,370
B 61	3/4	5/16	38,250	24,370	17,400	13,270	9,970
B 62	1/2	3/8	41,020	26,400	19,500	15,000	11,400
B 63	1/4	3/16	92,400	57,370	39,370	27,900	18,900
B 64	1/4	1/16	105,000	64,500	46,650	32,400	21,370
B 65	1/8	1/8	105,000	64,500	46,650	32,400	21,370
B 70	3/4	1/8	50,930	41,250	27,750	20,400	15,000
B 71	5/8	1/8	61,120	48,000	31,500	22,650	16,870
B 72	1/2	1/8	73,500	43,650	29,100	20,770	15,450
B 73	1/2	1/8	73,500	43,650	29,100	20,700	15,450
B 74	7/32	3/32	105,000	64,500	46,650	32,400	21,370
B 81	3/4	3/16	50,930	41,250	27,750	20,400	15,000
B 82	1/2	1/4	76,390	51,000	34,120	24,000	16,870
B 83	3/8	3/16	87,600	53,250	35,250	24,750	17,250
B 84	5/16	3/16	105,000	64,500	46,650	32,400	21,370
B 91	1/2	5/8	34,500	22,500	16,870	13,120	9,900
B 92	1/4	1/4	81,370	51,000	34,120	24,000	16,870
B 93	3/16	3/16	105,000	64,500	46,650	32,400	21,370
B 94	11/64	3/32	105,000	64,500	46,650	32,400	21,370
B 95	1/8	3/16	105,000	64,500	46,650	32,400	21,370
B 96	1/8	1/4	105,000	64,500	46,650	32,400	21,370
B 97	1/8	3/8	105,000	64,500	46,650	32,400	21,370
B 98	3/32	1/4	105,000	64,500	46,650	32,400	21,370
B 101	5/8	11/16	33,750	23,250	17,620	13,650	10,350

TABLE 29 GROUP B – (SHAPED WHEELS) MAXIMUM OPERATING SPEEDS (RPM) FOR 1/8” MANDRELS
Shape No.	Wheel Diameter Inches	Wheel Thickness Inches	1/2" Overhang & Thd. Mdls.	Overhang – Dimension O
				1”	1 1/2"	2”	2 1/2"
B 102	5/8	1/2	45,370	28,500	21,000	15,900	12,150
B 103	5/8	3/16	61,120	41,250	27,750	20,400	15,000
B 104	5/16	3/8	68,400	42,370	28,870	20,850	15,000
B 105	1/4	1/4	104,250	61,870	44,620	30,900	20,250
B 106	1/8	7/64	105,000	64,500	46,650	32,400	21,370
B 111	7/16	11/16	33,750	23,250	17,620	13,650	10,350
B 112	3/8	1/2	45,370	28,500	21,000	15,900	12,150
B 113	1/4	1/4	81,370	51,000	34,120	24,000	16,870
B 114	7/32	3/8	68,400	42,370	28,870	20,850	15,000
B 115	3/32	1/8	105,000	64,500	46,650	32,400	21,370
B 121	1/2	1/2	45,370	28,500	21,000	15,900	12,150
B 122	3/8	3/8	61,650	37,720	27,000	19,870	14,250
B 123	3/16	3/16	104,250	61,820	44,620	30,900	20,250
B 124	1/8	1/8	105,000	64,500	46,650	32,400	21,370
B 131	1/2	1/2	34,500	22,500	16,870	13,120	9,900
B 132	3/8	1/2	45,370	28,500	21,000	15,900	12,150
B 133	3/8	3/8	54,000	33,000	24,150	18,000	13,500
B 134	5/16	3/8	61,650	37,720	27,000	19,870	14,250
B 135	1/4	1/2	60,000	38,020	26,250	18,750	13,870
B 136	1/4	5/16	77,250	45,920	30,900	22,500	16,120

TABLE 30 GROUP B – (SHAPED WHEELS) MAXIMUM OPERATING SPEEDS (RPM) FOR 1/4" MANDRELS
Shape No.	Wheel Diameter Inches	Wheel Thickness Inches	1/2" Overhang   & Thd. Mdls.	Overhang – Dimension O
				1”	1 1/2"	2”	2 1/2"
B 41	5/8	5/8	61,120	46,500	35,250	27,370	21,000
B 42	1/2	3/4	61,120	46,500	35,250	27,370	21,000
B 51	7/16	3/4	81,000	54,370	42,000	33,000	25,500
B 52	3/8	3/4	81,000	54,370	42,000	33,000	25,500
B 61	3/4	5/16	50,930	50,930	38,100	29,020	22,500
B 62	1/2	3/8	71,250	47,620	35,020	27,000	20,850
B 71	5/8	1/8	61,120	61,120	48,000	37,500	29,020
B 72	1/2	1/8	76,390	62,400	45,750	35,400	27,520
B 73	1/2	1/8	76,390	62,400	45,750	35,400	27,520
B 91	1/2	5/8	61,500	42,000	31,500	24,000	18,370
B 101	5/8	11/16	61,120	46,500	35,250	27,370	21,000
B 102	5/8	1/2	61,120	54,370	42,000	33,000	25,500
B 111	7/16	11/16	66,000	46,500	35,250	27,370	21,000
B 112	3/8	1/2	81,000	54,370	42,000	33,000	25,500
B 121	1/2	1/2	76,390	54,370	42,000	33,000	25,500
B 131	1/2	1/2	61,500	42,000	31,500	24,000	18,370
B 132	3/8	1/2	81,000	54,370	42,000	33,000	25,500

TABLE 31 GROUP A – (SHAPED WHEELS) MAXIMUM OPERATING SPEEDS (RPM) FOR 1/4" MANDRELS
Shape No.	Wheel Diameter Inches	Wheel Thickness Inches	1/2" Overhang   & Thd. Mdls.	Overhang – Dimension O
				1”	1 1/2"	2”	2 1/2"	3”
A 1	3/4	2 1/2	19,800	16,500	13,120	10,650	9,000	6,750
A 2	1	1 1/4	38,200	32,620	25,500	20,620	16,870	13,500
A 3	1	2 3/4	16,100	13,080	10,730	8,720	6,710	4,700
A 4	1 1/4	1 1/4	30,560	24,750	20,250	16,120	13,120	10,500
A 5	3/4	1 1/8	45,000	33,750	27,000	21,000	16,500	13,500
A 6	3/4	1 1/8	39,000	29,700	24,000	18,970	15,000	12,000
A 11	7/8	2	19,860	15,100	12,000	9,810	8,220	7,020
A 12	11/16	1 1/4	48,000	35,250	27,370	21,750	17,250	13,500
A 13	1 1/8	1 1/8	33,950	32,250	25,500	20,620	16,500	12,750
A 14	11/16	7/8	55,560	40,500	30,750	24,370	19,500	15,000
A 15	1/4	1 1/16	72,750	47,620	34,500	26,250	19,870	13,870
A 21	1	1	34,500	26,250	21,000	17,250	13,870	10,870
A 22	3/4	5/8	50,930	40,500	30,750	24,370	19,500	15,000
A 23	3/4	1	39,370	30,370	24,370	19,500	15,000	12,000
A 24	1/4	3/4	76,500	49,500	36,370	27,000	20,250	15,370
A 25	1	1	35,620	27,370	22,120	18,000	14,250	11,250
A 26	5/8	5/8	61,120	46,500	35,250	27,750	21,370	15,750
A 31	1 3/8	1	27,780	26,250	21,000	17,250	13,500	10,870
A 32	1	5/8	38,200	38,200	30,000	24,000	18,900	15,000
A 33	1	1/2	38,200	38,200	30,000	24,000	18,900	15,000
A 34	1 1/2	3/8	25,470	25,470	25,470	21,970	18,000	13,870
A 35	1	3/8	38,200	38,200	31,500	25,500	20,250	15,900
A 36	1 5/8	3/8	23,520	23,520	23,520	21,750	17,620	13,870
A 37	1 1/4	1/4	30,560	30,560	30,560	28,100	22,500	18,000
A 38	1	1	34,500	26,250	21,000	17,020	13,500	10,650
A 39	3/4	3/4	47,250	35,250	27,750	22,120	17,250	13,120

History: 1990 AACS.