Inch Trapezoidal Synchronous Timing Belt Pulleys

MXL (.080") Pitch
For 1/8", 1/4", or 3/8" Belt Widths
Stocked in aluminum only. Other bore sizes available.
10-16 grooves have on set screw centered in hub.
18-120 grooves have two set screws at 90º centered in hub.
NOTE: ALL DIMENSIONS IN INCHES.  

example of part number structure   10-MXL-037-6F-A-125 # grooves - pitch - belt width - type - material - bore
PART NUMBER	Pitch Diam.	Pulley O.D.	Flange O.D. ±1/64	Overall Length	Face Width	Hub Diam ±1/64
10  MXL 037 6FC A 125	.255	.235	.425	.700	.500	.425
11  MXL 037 6FC A 125	.280	.260	.450	.700	.500	.450
12  MXL 037 6FC A 125	.306	.286	.480	.700	.500	.480
14  MXL 037 6FC A 125	.357	.337	.530	.700	.500	.530
15  MXL 037 6FC A 187	.382	.362	.555	.700	.500	.555
16  MXL 037 6FC A 187	.407	.387	.580	.700	.500	.580
18  MXL 037 6FC A 250	.458	.438	.635	.700	.500	.635
20  MXL 037 6FC A 250	.509	.489	.6854	.700	.500	.685
21  MXL 037 6FC A 250	.535	.515	.710	.700	.500	.710
22  MXL 037 6FC A 250	.560	.540	.740	.700	.500	.740
18  MXL 037 6F  A 187	.458	.438	.635	.750	.530	.312
20  MXL 037 6F  A 187	.509	.489	.685	.750	.530	.364
21  MXL 037 6F  A 187	.535	.515	.710	.750	.530	.390
22  MXL 037 6F  A 187	.560	.540	.740	.750	.530	.390
24  MXL 037 6F  A 250	.611	.591	.815	.812	.530	.442
25  MXL 037 6F  A 250	.637	.617	.815	.812	.530	.486
28  MXL 037 6F  A 250	.713	.693	.895	.812	.530	.494
30  MXL 037 6F  A 250	.764	.744	.945	.812	.530	.546
32  MXL 037 6F  A 250	.815	.795	1.000	.812	.530	.598
36  MXL 037 6F  A 250	.917	.897	1.105	.812	.530	.676
40  MXL 037 6F  A 250	1.019	.999	1.210	.812	.530	.754
42  MXL 037 6F  A 250	1.070	1.050	1.260	.845	.530	.806
44  MXL 037 6F  A 250	1.120	1.100	1.315	.845	.530	.858
48  MXL 037 6F  A 250	1.222	1.202	1.420	.845	.530	.936
60  MXL 037 6F  A 250	1.528	1.508	1.730	.845	.530	1.222
60  MXL 037 6   A 250	1.528	1.508	-	.875	.500	1.148
72  MXL 037 6   A 250	1.833	1.813	-	.875	.500	1.195
80  MXL 037 6   A 312	2.037	2.017	-	.875	.500	1.500
90  MXL 037 6   A 312	2.292	2.272	-	.875	.500	1.500
100 MXL 037 6   A 312	2.546	2.526	-	.875	.500	1.500
120 MXL 037 6   A 375	3.056	3.036	-	.875	.500	1.500

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XL (.200") Pitch
For 3/8" Belt Widths
Other bore sizes available.
10-12 grooves have one set screw centered in hub.
14-72 grooves have two set screws at 90º centered in hub.
NOTE: ALL DIMENSIONS IN INCHES.  

example of part number structure   10-XL-037-6F-A-187 # grooves - pitch - belt width - type - material - bore
PART NUMBER	Pitch Diam.	Pulley O.D.	Flange O.D. ±1/64	Face Width	Overall Length	Hub Diam.  ±1/64
10 XL 037 6F A/S 187	.637	.617	.875	.563	.813	.438
11 XL 037 6F A/S 187	.700	.680	.938	.563	.813	.500
12 XL 037 6F A/S 187	.764	.744	1.000	.563	.813	.500
14 XL 037 6F A/S 250	.891	.871	1.094	.563	.813	.563
15 XL 037 6F A/S 250	.955	.935	1.188	.563	.813	.625
16 XL 037 6F A/S 250	1.019	.999	1.250	.563	.813	.688
17 XL 037 6F A/S 250	1.082	1.062	1.313	.563	.813	.750
18 XL 037 6F A/S 250	1.146	1.126	1.375	.563	.813	.813
20 XL 037 6F A/S 250	1.273	1.253	1.500	.563	.875	.938
21 XL 037 6F A/S 250	1.337	1.317	1.563	.563	.875	1.000
22 XL 037 6F A/S 250	1.401	1.381	1.625	.563	.875	1.000
24 XL 037 6F A/S 250	1.528	1.508	1.750	.563	.906	1.063
25 XL 037 6F A/S 250	1.592	1.572	1.813	.563	.906	1.094
28 XL 037 6F A/S 250	1.783	1.763	2.000	.563	.906	1.188
30 XL 037 6F A/S 250	1.910	1.890	2.125	.563	.906	1.313
32 XL 037 6F A/S 312	2.037	2.017	2.250	.563	.906	1.438
36 XL 037 6  A   312	2.292	2.272	-	.563	1.000	1.500
40 XL 037 6  A   312	2.546	2.526	-	.563	1.000	1.500
42 XL 037 6  A   312	2.674	2.654	-	.563	1.000	1.500
44 XL 037 6  A   312	2.801	2.781	-	.563	1.000	1.500
48 XL 037 6W A   312	3.056	3.036	-	.563	1.000	1.500
60 XL 037 6W A   375	3.820	3.800	-	.563	1.000	1.500
72 XL 037 6W A   375	4.584	4.564	-	.563	1.000	1.500
example of part number structure   10-MXL-037-3F-A-188 # grooves - pitch - belt width - type - material - bore
PART NUMBER	Pitch Diam.	Pulley O.D.	Flange O.D. ±1/64	Face Width	Overall Length	Hub Diam.  ±1/64
10 XL 037 3F A/S 188	.637	.637	.875	.563	-	-
11 XL 037 3F A/S 188	.700	.700	.938	.563	-	-
12 XL 037 3F A/S 250	.764	.764	1.000	.563	-	-
14 XL 037 3F A/S 250	.891	.891	1.094	.563	-	-
15 XL 037 3F A/S 250	.955	.955	1.188	.563	-	-
16 XL 037 3F A/S 250	1.019	.019	1.250	.563	-	-
18 XL 037 3F A/S 250	1.146	1.146	1.375	.563	-	-
20 XL 037 3F A/S 250	1.2783	1.273	1.500	.563	-	-
21 XL 037 3F A/S 250	1.337	1.337	1.563	.563	-	-
22 XL 037 3F A/S 250	1.401	1.401	1.625	.563	-	-
24 XL 037 3F A/S 250	1.528	1.528	1.750	.563	-	-
28 XL 037 3F A/S 250	1.783	1.783	2.000	.563	-	-
30 XL 037 3F A/S 312	1.910	1.910	2.125	.563	-	-
32 XL 037 3F A/S 312	2.037	2.037	2.250	.563	-	-
36 XL 037 3  A   312	2.292	2.292	-	.563	-	-
40 XL 037 3  A   312	2.546	2.546	-	.563	-	-
42 XL 037 3  A   312	2.674	2.674	-	.563	-	-
48 XL 037 3  A   312	3.056	3.056	-	.563	-	-
60 XL 037 3  A   375	3.820	3.820	-	.563	-	-
72 XL 037 3  A   375	4.584	4.584	-	.563	-	-

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L (.375") Pitch
For 1/2" Belt Widths
Other belt widths and bore sizes available.
Includes two set screws at 90º centered in face.
NOTE: ALL DIMENSIONS IN INCHES.  

example of part number structure   10-L-050-3F-A-375 # grooves - pitch - belt width - type - material - bore
PART NUMBER	Pitch Diam.	Pulley O.D.	Flange O.D. ±1/64	Face Width	Overall Length	Hub Diam.  ±1/64
10 L 050 3F A/S 375	1.194	1.164	1.438	.750	-	-
11 L 050 3F A/S 375	1.313	1.283	1.531	.750	-	-
12 L 050 3F A/S 375	1.432	1.402	1.656	.750	-	-
13 L 050 3F A/S 375	1.552	1.522	1.781	.750	-	-
14 L 050 3F A/S 375	1.671	1.641	1.906	.750	-	-
15 L 050 3F A/S 375	1.790	1.760	2.031	.750	-	-
16 L 050 3F A/S 500	1.910	1.880	2.125	.750	-	-
17 L 050 3F A/S 500	2.029	1.999	2.250	.750	-	-
18 L 050 3F A/S 500	2.149	2.119	2.375	.750	-	-
19 L 050 3F A/S 500	2.268	2.238	2.500	.750	-	-
20 L 050 3F A/S 500	2.387	2.357	2.625	.750	-	-
21 L 050 3F A/S 500	2.507	2.477	2.750	.750	-	-
22 L 050 3F A/S 500	2.626	2.596	2.875	.750	-	-
24 L 050 3F A/S 500	2.865	2.835	3.094	.750	-	-
10 L 050 6F A/S 375	1.194	1.164	1.438	.750	1.125	.813
11 L 050 6F A/S 375	1.313	1.283	1.531	.750	1.125	.938
12 L 050 6F A/S 375	1.432	1.402	1.656	.750	1.250	1.063
13 L 050 6F A/S 375	1.552	1.522	1.781	.750	1.250	1.094
14 L 050 6F A/S 375	1.671	1.641	1.906	.750	1.250	1.125
15 L 050 6F A/S 375	1.790	1.760	2.031	.750	1.250	1.250
16 L 050 6F A/S 500	1.910	1.880	2.125	.750	1.375	1.438
17 L 050 6F A/S 500	2.029	1.999	2.250	.750	1.375	1.500
18 L 050 6F A/S 500	2.149	2.119	2.375	.750	1.375	1.563
19 L 050 6F A/S 500	2.268	2.238	2.500	.750	1.375	1.625
20 L 050 6F A/S 500	2.387	2.357	2.625	.750	1.375	1.688
21 L 050 6F A/S 500	2.507	2.477	2.750	.750	1.438	1.875
22 L 050 6F A/S 500	2.626	2.596	2.875	.750	1.500	2.000
24 L 050 6F A/S 500	2.865	2.835	3.094	.750	1.500	2.250

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H (.500") Pitch
For 1" Belt Widths
Other belt widths and bore sizes available.
Includes two set screws at 90º centered in face.
NOTE: ALL DIMENSIONS IN INCHES.  

example of part number structure   10-H-100-6F-S-625 # grooves - pitch - belt width - type - material - bore
PART NUMBER	Pitch Diam.	Pulley O.D.	Flange O.D. ±1/64	O.A.L	Face Width	Hub Diam. ±1/64
14 H 100 6F S 625	2.228	2.174	2-15/32	1-5/16	1-5/16	1-1/2
16 H 100 6F S 625	2.546	2.492	2-25/32	2-1/16	1-5/16	2
17 H 100 6F S 625	2.706	2.652	3	2-1/16	1-5/16	2
18 H 100 6F S 625	2.865	2.811	3-1/8	2-1/16	1-5/16	2-1/4
19 H 100 6F S 625	3.024	2.970	3-1/4	2-1/8	1-5/16	2-3/8
20 H 100 6F S 625	3.183	3.129	3-27/64	2-3/16	1-5/16	2-1/2
21 H 100 6F S 750	3.342	3.288	3-37/64	2-5/16	1-5/16	2-5/8
22 H 100 6F S 750	3.501	3.447	3-3/4	2-5/16	1-5/16	2-7/8
24 H 100 6F S 750	3.820	3.766	4-1/16	2-5/16	1-5/16	3-1/8
26 H 100 6F S 750	4.138	4.084	4-3/8	2-7/16	1-5/16	3-1/2
28 H 100 6F S 750	4.456	4.402	4-11/16	2-7/16	1-5/16	3-5/8
30 H 100 6F S 750	4.775	4.721	5	2-3/8	1-5/16	3-5/8
14 H 150 6F S 750	2.228	2.174	2-15/32	2-7/16	1-13/16	1-1/2
16 H 150 6F S 750	2.546	2.492	2-25/32	2-9/16	1-13/16	2
17 H 150 6F S 750	2.706	2.652	3	2-9/16	1-13/16	2
18 H 150 6F S 750	2.865	2.811	3-1/8	2-9/16	1-13/16	2-1/4
19 H 150 6F S 750	3.024	2.970	3-1/4	2-5/8	1-13/16	2-3/8
20 H 150 6F S 750	3.183	3.129	3-27/64	2-11/16	1-13/16	2-1/2
21 H 150 6F S 750	3.342	3.288	3-37/64	2-3/4	1-13/16	2-5/8
22 H 150 6F S 750	3.501	3.447	3-3/4	2-13/16	1-13/16	2-7/8
24 H 150 6F S 750	3.820	3.766	4-1/16	2-13/16	1-13/16	3-1/8
26 H 150 6F S 750	4.138	4.084	4-3/8	2-13/16	1-13/16	3-1/2
28 H 150 6F S 750	4.456	4.402	4-11/16	2-15/16	1-13/16	3-5/8
30 H 150 6F S 750	4.775	4.721	5	2-7/8	1-13/16	3-5/8

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part number configuration, definitions, and conversions

# Grooves

Use any suitable number of grooves. ex: 12 or 18

Pitch

RMA/MPTA Pitch Designation. .080" = MXL .200" = XL .375" = L .500" = H

Belt Width

Belt width expressed according to MPTA/RMA IP-24 standard. 3/8" = .375 = 037 1/2" = .500 = 050 1-1/2" = 1.500 = 150

Type

See drawings for type design. 6FC, 6F, 6, 6W, 3F, or 3

Material

Steel = S, or Aluminum = A

Bore

Bore dimensions expressed in decimal inches. 1/8" = .125 = 125 1/2" = .500 = 500 3/4" = .750 = 750