What timing pulley profiles does Bason manufacture?

Bason manufactures timing pulleys in 24 profile types: MXL, XL, L, H, XH (inch series); T10, AT5, AT10 (metric); S2M, S3M, S5M, S8M, S14M (HTD); 3M, 5M, 8M, 14M (PowerGrip); G2M, G3M, G5M (Gates); P2M, P3M, P5M, P8M (PolyChain). All profiles available in aluminum or steel.

What materials are available for Bason timing pulleys?

Bason timing pulleys are available in: Aluminum 6061 with natural anodized finish (BLA); Steel S45C with black oxide finish (BSY); Steel S45C with zinc plating (BSD). Custom materials including stainless steel and brass are available on request.

What bore types are available for timing pulleys?

Four bore types are available: H = round bore (pilot bore); P = round bore with threaded hole for set screw; C = keyway bore; N = keyway bore with threaded hole. Threaded hole sizes range from M3 to M10 depending on bore diameter.

Timing Pulley Specifications — Full Catalog

Material Codes

BLA

Aluminum 6061 — Natural Anodized

BSY

Steel S45C — Black Oxide

BSD

Steel S45C — Zinc Plated

Bore Types

Round bore (pilot bore)

Round bore + threaded set screw hole

Keyway bore

Keyway bore + threaded set screw hole

Inch: MXL/XL/L/H/XH

Metric: T10/AT5/AT10

HTD: S2M-S14M

PowerGrip: 3M/5M/8M/14M

Gates: G2M/G3M/G5M

PolyChain: P2M-P8M

MXL Synchronous Pulley (Pitch 2.032mm / 0.080")

Spec	Shape	Pitch Dia (mm)	Outer Dia (mm)	Flange OD	Flange ID	Hub Dia	Bore A (mm)	Bore B/C (mm)
14MXL	C	9.06	8.55	12	6	12	3-4	3-4
15MXL	C	9.70	9.19	12	6	12	3-4	3-4
16MXL	C	10.35	9.84	14	7	14	3-5	3-5
18MXL	C	11.64	11.14	14	7	14	3-5	3-5
20MXL	C	12.94	12.43	18	11	9	3-6	4-6
22MXL	C	14.23	13.72	18	11	9	3-6	4-6
24MXL	A	15.52	15.02	20	12	11	3-8	4-7
25MXL	A	16.17	15.66	20	12	11	3-8	4-7
28MXL	A	18.11	17.60	23	13	12	4-9	4-8
30MXL	A	19.40	18.90	25	16	14	4-11	8
36MXL	A	23.29	22.78	28	18	16	5-13	8-11
40MXL	B	25.87	25.36	31	20	18	5-15	8-13
48MXL	B	31.05	30.54	35	24	22	5-20	8-18
50MXL	B	32.34	31.83	35	24	22	5-20	8-19
60MXL	B	38.81	38.30	44	32	28	5-27	8-25
72MXL	B	46.57	46.06	52	38	30	5-35	8-33

Standard widths: 019=4.8mm, 025=6.4mm, 037=9.5mm, 050=12.7mm. Threaded hole: dH7 3-5→M3, 6-18→M4, 19-21→M5.

XL Synchronous Pulley (Pitch 5.080mm / 0.200")

Spec	Shape	Pitch Dia (mm)	Outer Dia (mm)	Flange OD	Flange ID	Hub Dia	Bore A (mm)	Bore B (mm)
10XL	A	16.17	15.66	20	12	10	4-7	5-6
12XL	A	19.40	18.89	25	14	12	4-10	6-8
15XL	A	24.26	23.75	32	20	17	5-13	6-13
20XL	A	32.34	31.83	38	26	24	8-19	8-19
25XL	B	40.43	39.92	48	36	30	8-27	8-26
30XL	B	48.51	48.00	55	39	35	10-32	10-31
36XL	B	58.21	57.70	67	50	40	10-42	10-36
40XL	B	64.68	64.17	74	53	40	10-50	10-36
50XL	B	80.85	80.34	87	68	40	10-59	10-36
60XL	B	97.02	96.51	105	84	40	10-76	10-36
72XL	B	116.43	115.92	123	101	40	10-80	10-36

Standard widths: 025=6.4mm, 031=7.9mm, 037=9.5mm, 050=12.7mm.

L Synchronous Pulley (Pitch 9.525mm / 0.375")

Spec	Shape	Pitch Dia (mm)	Outer Dia (mm)	Flange OD	Flange ID	Hub Dia	Bore A (mm)	Bore B/W (mm)
12L	A	36.38	35.62	43	30	27	8-22	8-22
16L	A	48.51	47.75	55	39	32	10-32	10-28
20L	A	60.64	59.88	67	50	40	12-42	12-36
24L	B	72.77	72.01	83	63	50	12-59	12-46
28L	B	84.89	84.13	94	74	50	12-67	12-46
30L	B	90.96	90.20	99	78	56	12-72	12-52
36L	B	109.15	108.39	119	100	63	14-80	14-59
40L	B	121.28	120.52	131	111	63	16-80	16-67
50L	B	151.60	150.84	160	140	71	16-80	16-67
72L	B	218.30	217.54	—	—	71	16-100	16-67

Standard widths: K:14/21/27/40, W:19/26/32/45, L:31-57mm depending on teeth count.

H Synchronous Pulley (Pitch 12.700mm / 0.500")

Spec	Shape	Pitch Dia (mm)	Outer Dia (mm)	Flange OD	Flange ID	Hub Dia	Bore A (mm)	Bore B (mm)
14H	A	56.60	55.22	60	46	39	12-37	12-35
18H	A	72.77	71.39	80	60	50	12-52	12-46
20H	A	80.85	79.48	87	68	58	14-59	14-54
24H	A	97.02	95.65	105	84	58	16-76	16-59
25H	B	101.06	99.69	112	90	63	16-80	20-59
30H	B	121.28	119.90	126	100	63	20-80	20-59
36H	B	145.53	144.16	152	134	71	20-80	20-67
40H	B	161.70	160.33	170	150	88	20-80	20-67
50H	W	202.13	200.76	210	185	88	20-100	20-67
72H	W	291.06	289.69	—	—	88	—	25-67

Standard widths: 075=19.1mm, 100=25.4mm, 150=38.1mm, 200=50.8mm.

XH Synchronous Pulley (Pitch 22.225mm / 0.875")

Spec	Pitch Dia (mm)	Outer Dia (mm)	Flange OD	Flange ID	Hub Dia	Bore A (mm)	Bore B/W (mm)
18XH	127.34	124.55	136	101	80	24-60	24-52
20XH	141.49	138.69	155	94	90	24-60	24-55
24XH	176.86	174.07	188	130	120	28-110	28-90
25XH	183.93	181.14	190	161	120	28-110	28-90
28XH	212.23	209.44	224	190	120	32-142	32-102
30XH	240.53	237.74	260	220	120	35-142	35-102
34XH	424.47	421.67	—	—	150	40-120	40-120

Standard widths: 200=50.8mm, 300=76.2mm.

T10 Synchronous Pulley (Pitch 10mm)

Spec	Shape	Pitch Dia (mm)	Outer Dia (mm)	Flange OD	Flange ID	Hub Dia	Bore (mm)
T10x12	A	38.20	36.35	40	27	—	12-19
T10x15	A	47.75	45.90	51	36	33	12-28
T10x20	A	63.66	61.81	67	50	47	12-42
T10x25	A	79.58	77.73	86	66	63	14-59
T10x30	A	95.49	93.64	105	84	75	16-76
T10x36	A	114.59	112.74	123	101	95	20-80
T10x40	A	127.32	125.47	135	115	100	20-80
T10x50	A	159.15	157.30	170	150	100	20-80
T10x60	A	190.99	189.14	201	171	100	20-80

Standard widths: K:15mm, W:20mm, L:25mm, M:30mm, Q:40mm, S:50mm.

AT5 Synchronous Pulley (Pitch 5mm)

Spec	Shape	Pitch Dia (mm)	Outer Dia (mm)	Flange OD	Flange ID	Hub Dia	Bore A (mm)	Bore B (mm)
AT5X15	A	23.88	22.63	28	18	13	5-10	5-10
AT5X20	A	31.83	30.58	35	24	20	6-16	6-15
AT5X25	A	39.79	38.54	44	32	25	7-22	7-22
AT5X30	B	47.75	46.50	51	36	35	10-28	8-28
AT5X40	B	63.66	62.41	67	50	45	10-42	10-42
AT5X50	B	79.58	78.33	87	67	45	12-59	12-59
AT5X60	B	95.49	94.24	99	78	45	12-72	12-71

Threaded hole: dH7 5→M3, 6-12→M4, 13-17→M5, 18-30→M6, 31-45→M8.

AT10 Synchronous Pulley (Pitch 10mm)

Spec	Shape	Pitch Dia (mm)	Outer Dia (mm)	Flange OD	Flange ID	Hub Dia	Bore A (mm)	Bore B (mm)
AT10X14	A	44.56	42.71	48	36	34	10-27	10-27
AT10X20	A	63.66	61.81	67	50	40	12-42	12-42
AT10X25	B	79.58	77.73	87	68	50	12-59	12-59
AT10X30	B	95.49	93.64	105	84	60	12-76	12-71
AT10X40	B	127.32	125.47	135	115	60	20-80	20-80
AT10X48	B	152.78	150.93	160	140	60	20-80	20-80

Standard widths: 15/20/25/30/40/50mm. Threaded hole: 10-12→M4, 13-17→M5, 18-30→M6, 31-45→M8, 46-65→M10.

S2M Synchronous Pulley (Pitch 2mm)

Spec	Shape	Pitch Dia (mm)	Outer Dia (mm)	Flange OD	Flange ID	Hub Dia	Bore (mm)
14-S2M	A	8.91	8.40	12	6	12	3-4
20-S2M	A	12.73	12.22	16	9.5	16	3-5
25-S2M	A	15.92	15.41	20	12	20	3-4
30-S2M	A	17.83	17.32	23	13	23	3-4
40-S2M	A	23.56	23.11	31	20	31	4-10
50-S2M	A	28.56	28.05	41	28	41	4-10
60-S2M	A	33.56	33.05	51	33	51	4-10
72-S2M	A	39.56	39.05	63	39	63	4-10

Standard widths: 04=4mm, 06=6mm, 10=10mm, 12=12mm.

S3M Synchronous Pulley (Pitch 3mm)

Spec	Shape	Pitch Dia (mm)	Outer Dia (mm)	Flange OD	Flange ID	Hub Dia	Bore A (mm)	Bore B/C (mm)
14-S3M	A	13.37	12.61	16	9.5	16	4-6	4-6
20-S3M	A	19.10	18.34	23	13	22	4-9	4-8
25-S3M	A	23.87	23.11	28	18	16	4-11	4-11
30-S3M	A	28.65	27.89	33	22	20	6-15	6-15
36-S3M	A	34.38	33.62	40	27	26	6-20	6-20
40-S3M	A	38.20	37.44	44	32	30	8-24	8-24
50-S3M	A	47.75	46.98	52	38	34	8-32	8-30
60-S3M	B	57.30	56.53	60	46	39	8-38	8-35
72-S3M	B	68.76	68.00	75	55	50	8-30	8-46

Standard widths: 06=6mm, 10=10mm, 15=15mm.

S5M Synchronous Pulley (Pitch 5mm)

Spec	Shape	Pitch Dia (mm)	Outer Dia (mm)	Flange OD	Flange ID	Hub Dia	Bore (mm)
14-S5M	A	22.28	21.32	25	16	14	6-10
20-S5M	A	31.83	30.87	35	24	19	7-16
25-S5M	A	39.79	38.83	44	32	27	7-22
30-S5M	B	47.75	46.79	51	36	33	10-28
36-S5M	B	57.30	56.34	60	46	40	10-37
40-S5M	B	63.66	62.70	67	50	47	10-42
50-S5M	B	79.58	78.62	87	68	63	12-59
60-S5M	B	95.48	94.52	99	78	75	12-72
72-S5M	B	114.59	113.63	119	100	90	12-80

Standard widths: 10=10mm, 15=15mm, 25=25mm.

S8M Synchronous Pulley (Pitch 8mm)

Spec	Shape	Pitch Dia (mm)	Outer Dia (mm)	Flange OD	Flange ID	Hub Dia	Bore (mm)
18-S8M	A	45.84	44.47	51	36	32	12-28
22-S8M	A	56.02	54.65	60	46	41	12-37
25-S8M	A	63.66	62.29	70	55	48	12-48
30-S8M	A	76.39	75.02	86	66	60	14-59
36-S8M	B	91.67	90.30	99	78	75	16-72
40-S8M	B	101.86	100.49	112	90	85	20-80
50-S8M	B	127.32	125.95	135	115	100	20-80
60-S8M	B	152.79	151.42	160	140	100	20-80
72-S8M	B	183.35	181.98	190	161	100	20-80

Standard widths: 15/25/30/40mm. Threaded hole: 12→M4, 13-17→M5, 18-30→M6, 31-45→M8, 46-65→M10.

S14M Synchronous Pulley (Pitch 14mm)

Spec	Shape	Pitch Dia (mm)	Outer Dia (mm)	Flange OD	Flange ID	Hub Dia	Bore (mm)
28-S14M	A	124.78	121.98	136	101	90	20-45
30-S14M	A	133.69	130.89	144	111	100	20-55
34-S14M	A	151.52	148.72	161	131	120	25-65
40-S14M	B	178.25	175.45	190	161	135	28-75
44-S14M	B	196.08	193.28	208	173	155	28-100
50-S14M	B	222.82	220.02	235	200	160	32-120
56-S14M	B	249.55	246.75	260	224	160	35-120

Standard widths: 40=40mm, 60=60mm.

3M Synchronous Pulley (Pitch 3mm)

Spec	Shape	Pitch Dia (mm)	Outer Dia (mm)	Flange OD	Flange ID	Hub Dia	Bore A (mm)	Bore B/C (mm)
14-3M	C	13.37	12.61	16	9.5	16	4-6	4-6
16-3M	C	15.28	14.52	18	11	18	4-7	4-7
20-3M	A	19.10	18.34	23	13	23	4-9	4-8
25-3M	A	23.87	23.11	28	18	16	4-11	4-11
30-3M	A	28.65	27.89	33	22	20	6-15	6-15
36-3M	B	34.38	33.62	41	28	26	6-20	6-20
40-3M	B	38.20	37.44	44	32	30	8-24	8-24
50-3M	B	47.75	46.98	52	38	34	8-32	8-30
60-3M	B	57.30	56.53	60	46	39	8-38	8-35
72-3M	B	68.76	68.00	75	55	50	8-50	8-46

Standard widths: 06=6mm, 09=9mm, 12=12mm, 15=15mm. Threaded hole: 4-5→M3, 6-17→M4, 18-33→M5.

5M Synchronous Pulley (Pitch 5mm)

Spec	Shape	Pitch Dia (mm)	Outer Dia (mm)	Hub Dia	Flange OD	Flange ID	Bore A (mm)	Bore B (mm)
14-5M	A	22.28	21.14	14	25	16	6-10	6-10
16-5M	A	25.46	24.32	17	32	20	7-12	7-12
20-5M	A	31.83	30.69	19	35	24	7-16	7-15
25-5M	A	39.79	38.65	27	44	32	7-22	7-22
30-5M	B	47.75	46.61	33	51	36	10-28	10-28
36-5M	B	57.30	56.16	40	60	46	10-37	10-36
40-5M	B	63.66	62.52	47	67	50	10-42	10-42
50-5M	B	79.58	78.44	63	86	66	12-59	12-59
60-5M	B	95.48	94.34	75	99	78	12-72	12-71
72-5M	B	114.59	113.45	90	119	100	12-80	12-80

Standard widths: 09=9mm, 15=15mm, 25=25mm, 30=30mm. Threaded hole: 5→M3, 6-12→M4, 13-17→M5, 18-30→M6, 31-45→M8.

8M Synchronous Pulley (Pitch 8mm)

Spec	Shape	Pitch Dia (mm)	Outer Dia (mm)	Flange OD	Flange ID	Hub Dia	Bore A (mm)	Bore B (mm)
18-8M	A	45.84	44.47	51	36	32	12-28	12-28
20-8M	A	50.93	49.56	57	41	36	12-32	12-32
25-8M	A	63.66	62.29	70	55	48	12-48	12-44
30-8M	A	76.39	75.02	86	66	60	14-59	14-56
36-8M	B	91.67	90.30	99	78	75	16-72	16-71
40-8M	B	101.86	100.49	112	90	85	20-80	20-80
48-8M	B	122.23	120.86	131	111	100	20-80	20-80
60-8M	B	152.79	151.42	160	140	100	20-80	20-80
72-8M	B	183.35	181.98	190	161	100	20-80	20-80

Standard widths: 20/25/30/40mm. Threaded hole: 13-17→M4, 18-30→M5, 31-45→M6, 46-65→M8, 65+→M10.

G2M Synchronous Pulley (Pitch 2mm)

Spec	Shape	Pitch Dia (mm)	Outer Dia (mm)	Flange OD	Flange ID	Hub Dia	Bore A (mm)	Bore B (mm)
14-G2M	A	8.91	8.40	12	6	3	—	—
20-G2M	A	12.73	12.22	16	9.5	4-6	—	—
25-G2M	A	15.92	15.41	20	12	10	5-7	5-7
30-G2M	A	19.10	18.59	23	13	11	5-8	5-8
40-G2M	A	25.46	24.95	31	20	17	6-12	6-12
50-G2M	B	31.83	31.32	35	24	22	8-17	8-16
60-G2M	B	38.20	37.69	44	32	28	8-24	8-22

Standard widths: 04=4mm, 06=6mm, 09=9mm. Threaded hole: 3-4→M3, 5-6→M4.

G3M Synchronous Pulley (Pitch 3mm)

Spec	Shape	Pitch Dia (mm)	Outer Dia (mm)	Flange OD	Flange ID	Hub Dia	Bore (mm)
16-G3M	A	15.28	14.52	18	11	—	4-7
20-G3M	A	19.10	18.34	23	13	—	5-9
25-G3M	A	23.87	23.11	28	18	14	6-11
30-G3M	A	28.65	27.89	33	22	19	6-15
36-G3M	B	34.38	33.62	40	27	24	8-20
40-G3M	B	38.20	37.44	44	32	28	8-24
50-G3M	B	47.75	46.98	52	38	34	10-32
60-G3M	B	57.30	56.53	60	46	36	12-38

Standard widths: 06=6mm, 09=9mm, 15=15mm.

G5M Synchronous Pulley (Pitch 5mm)

Spec	Shape	Pitch Dia (mm)	Outer Dia (mm)	Flange OD	Flange ID	Hub Dia	Bore A (mm)	Bore B (mm)
14-G5M	A	22.28	21.14	25	16	12	6-10	—
18-G5M	A	28.65	27.51	33	22	18	6-14	6-9
22-G5M	A	35.01	33.87	40	27	22	8-19	8-12
26-G5M	A	41.38	40.24	48	36	28	10-27	10-21
30-G5M	B	47.75	46.61	51	36	32	10-28	10-26
36-G5M	B	57.30	56.16	60	46	38	12-37	12-34
44-G5M	B	70.03	68.89	75	55	42	12-50	12-42
50-G5M	B	79.58	78.44	87	68	46	12-59	12-45

Standard width: K:10.3, W:14, L:22mm.

P2M Synchronous Pulley (Pitch 2mm)

Spec	Shape	Pitch Dia (mm)	Outer Dia (mm)	Flange OD	Flange ID	Hub Dia	Bore (mm)
14-P2M	C	8.91	8.40	12	6	12	3-4
20-P2M	C	12.73	12.22	16	9.5	17	4-6.35
25-P2M	C	15.92	15.41	20	12	20	4-6.35
30-P2M	C	19.10	18.59	23	13	12	5-8
40-P2M	B	25.46	24.95	31	20	16	5-10
50-P2M	B	31.83	31.32	35	24	22	5-15
60-P2M	B	38.20	37.69	44	32	28	5-19

Standard widths: 04=4mm, 06=6mm, 12=12mm. Threaded hole: 3-6.35→M3, 7-19→M4.

P3M Synchronous Pulley (Pitch 3mm)

Spec	Shape	Pitch Dia (mm)	Outer Dia (mm)	Flange OD	Flange ID	Hub Dia	Bore (mm)
10-P3M	C	9.55	8.79	12	6	12	4
14-P3M	C	13.37	12.61	15	8	17	4-6.35
20-P3M	C	19.10	18.34	23	13	25	4-6.35
25-P3M	C	23.87	23.11	28	18	14	5-9
30-P3M	B	28.65	27.89	33	22	18	6-12
40-P3M	B	38.20	37.44	44	32	26	6-18

Standard widths: 10=10mm, 15=15mm. Threaded hole: 4-6.35→M3, 7-12→M4, 13-18→M5.

P5M Synchronous Pulley (Pitch 5mm)

Spec	Shape	Pitch Dia (mm)	Outer Dia (mm)	Flange OD	Flange ID	Hub Dia	Bore (mm)
12-P5M	A	19.10	17.96	23	13	11	5-6
16-P5M	A	25.46	24.32	32	20	17	5-10
20-P5M	A	31.83	30.69	35	24	19	6-12
25-P5M	A	39.79	38.65	44	32	30	10-20
30-P5M	B	47.75	46.61	51	36	35	12-24
40-P5M	B	63.66	62.52	67	50	48	12-32
50-P5M	B	79.58	78.44	87	68	64	15-42
72-P5M	B	114.59	113.45	119	100	90	15-80

Standard widths: K:10, W:11.6, L:16-44mm.

P8M Synchronous Pulley (Pitch 8mm)

Spec	Shape	Pitch Dia (mm)	Outer Dia (mm)	Flange OD	Flange ID	Hub Dia	Bore (mm)
20-P8M	A	50.93	49.56	55	39	36	12-32
25-P8M	A	63.66	62.29	70	55	48	12-48
30-P8M	A	76.39	75.02	87	68	60	14-59
36-P8M	B	91.67	90.30	99	78	75	16-72
40-P8M	B	101.86	100.49	112	90	85	20-80
50-P8M	B	127.32	125.95	135	115	100	20-80
60-P8M	B	152.79	151.42	160	140	100	20-80

Standard widths: 15/25/30/40mm.

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Note: These specifications are for reference. Custom bore, keyway, flange, and material configurations are available. Tooth groove dimensions may vary slightly depending on tooth count. Contact us for custom specifications.

Timing Pulley Specifications