H8M Chain and Belt Pulleys

Filter by

System of Measurement

Inch

Metric

For Maximum Belt Width

20 mm

30 mm

50 mm

Number of Teeth

Shaft Diameter

Belt Trade Size

Mount Type

Teeth Shape

Pitch

Bore Type

Pulley Type

Shaft Type

Width

Hub Diameter

Material

Diameter

Shaft Mount Type

Bushing Trade Number

Bearing Material

Inside Width

Overall Width

RoHS

Export Control Classification Number (ECCN)

EAR99

DFARS Specialty Metals

REACH

24 Products

High-Strength HTD Timing Belt Idler Pulleys

Keep high torque drive (HTD) timing belt systems running tightly with these idler pulleys. Made with built-in, free-spinning ball bearings, they're installed on shafts or belt tensioners (not included) to remove slack from timing belts. By maintaining tension on the belt, these pulleys reduce wear and vibration in 3D printing, machine tool drives, robotics, and other linear motion applications that require precise positioning.

When replacing an idler pulley, be sure the pulley matches your belt's trade size.

Toothed pulleys are shaped to mesh with the teeth on a timing belt, which reduces wear on the belt's teeth.

Iron pulleys are strong and wear resistant, with a black oxide coating that protects them from corrosion in dry environments.

For technical drawings and 3-D models, click on a part number.

Toothed

For 30 mm Max. Belt Wd.
OD	Number of Teeth	For Shaft Dia.	Dia.	Wd.	Shaft Mount Type	Bore Type	Fabrication	Material	Bearing Type		Each
1.85"	19	1"	1.85"	1 5/16"	Press Fit	Plain	Machined	Black-Oxide Iron	Needle Roller	0000000	000000

High-Strength HTD Timing Belt Pulleys

These HTD (high torque drive) pulleys have a curved tooth shape that provides higher strength than trapezoidal teeth. Select a pulley with a maximum belt width that’s the same or larger than your timing belt width.

Press-fit mount pulleys come machined to the for shaft diameter size and are machinable up to the for maximum shaft diameter size.

Bushing-mount pulleys grip the shaft more securely than pulleys that press fit. Quick-disconnect (QD) bushings and split-tapered bushings sold separately.

For technical drawings and 3-D models, click on a part number.

Press-Fit Mount

For 20 mm Max. Belt Wd.
For Belt Trade Size	OD, mm	Number of Teeth	Pitch, mm	For Shaft Dia.	For Max. Shaft Dia.	Bore Type	Inside Wd., mm	Outside Wd., mm	Overall Wd., mm	Pitch Dia., mm	Number of Flanges	Fabrication	Material	Hub Dia., mm		Each
H8M	65.03	22	8	1/2"	1.188"	Plain	22.23	28.58	44.45	56.032	2	Machined	Black-Oxide Iron	41.28	00000000	000000
For 30 mm Max. Belt Wd.
H8M	65.03	22	8	1/2"	1.188"	Plain	31.75	38.1	53.98	56.032	2	Machined	Black-Oxide Iron	41.28	00000000	00000
H8M	70.11	24	8	1/2"	1 1/4"	Plain	31.75	38.1	53.98	61.112	2	Machined	Black-Oxide Iron	46.02	00000000	00000
H8M	74.93	26	8	1/2"	1 1/4"	Plain	31.75	38.1	57.15	66.217	2	Machined	Black-Oxide Iron	50.8	00000000	00000

Bushing Mount

For 20 mm Max. Belt Wd.
For Belt Trade Size	OD, mm	Number of Teeth	Pitch, mm	ID	Bore Type	For Bushing Style	Inside Wd., mm	Outside Wd., mm	Overall Wd., mm	Pitch Dia., mm	Number of Flanges	Fabrication	Material		Each
H8M	74.93	26	8	1.375"	Finished	Quick Disconnect Style JA	22.23	28.58	28.58	66.217	2	Machined	Black-Oxide Iron	00000000	000000
H8M	80.01	28	8	1.625"	Finished	Split Tapered Style H	22.23	28.58	28.58	71.297	2	Machined	Black-Oxide Iron	00000000	00000
H8M	85.09	30	8	1.625"	Finished	Split Tapered Style H	22.23	28.58	28.58	76.403	2	Machined	Black-Oxide Iron	00000000	00000
H8M	97.03	34	8	1.871"	Finished	Quick Disconnect Style SH	22.35	28.7	28.7	86.588	2	Machined	Black-Oxide Iron	00000000	00000
H8M	109.99	40	8	1.871"	Finished	Quick Disconnect Style SH	22.35	28.7	28.7	101.854	2	Machined	Black-Oxide Iron	0000000	00000
H8M	120.91	44	8	2.187"	Finished	Quick Disconnect Style SDS	22.35	28.7	28.7	112.039	2	Machined	Black-Oxide Iron	00000000	00000
H8M	131.07	48	8	2.187"	Finished	Quick Disconnect Style SDS	22.35	28.7	28.7	122.224	2	Machined	Black-Oxide Iron	00000000	00000
H8M	151.13	56	8	2.187"	Finished	Quick Disconnect Style SDS	22.35	28.7	28.7	142.595	2	Machined	Black-Oxide Iron	00000000	000000
For 30 mm Max. Belt Wd.
H8M	80.01	28	8	1.625"	Finished	Split Tapered Style H	31.75	38.1	38.1	71.297	2	Machined	Black-Oxide Iron	00000000	00000
H8M	85.09	30	8	1.625"	Finished	Split Tapered Style H	31.75	38.1	38.1	76.403	2	Machined	Black-Oxide Iron	00000000	00000
H8M	89.92	32	8	1.625"	Finished	Split Tapered Style H	31.88	38.23	38.23	81.483	2	Machined	Black-Oxide Iron	00000000	00000
H8M	97.03	34	8	1.871"	Finished	Quick Disconnect Style SH	31.88	38.23	38.23	86.588	2	Machined	Black-Oxide Iron	00000000	00000
H8M	109.99	40	8	1.871"	Finished	Quick Disconnect Style SH	31.88	38.23	38.23	101.854	2	Machined	Black-Oxide Iron	0000000	00000
H8M	120.91	44	8	2.187"	Finished	Quick Disconnect Style SDS	31.88	38.23	38.23	112.039	2	Machined	Black-Oxide Iron	00000000	00000
H8M	131.07	48	8	2.187"	Finished	Quick Disconnect Style SDS	31.88	38.23	38.23	122.224	2	Machined	Black-Oxide Iron	00000000	00000
H8M	151.13	56	8	2.187"	Finished	Quick Disconnect Style SDS	31.88	38.23	38.23	142.595	2	Machined	Black-Oxide Iron	00000000	000000
For 50 mm Max. Belt Wd.
H8M	97.03	34	8	1.871"	Finished	Quick Disconnect Style SH	54.1	60.45	60.45	86.588	2	Machined	Black-Oxide Iron	0000000	000000
H8M	100.08	36	8	1.871"	Finished	Quick Disconnect Style SH	54.1	60.45	60.45	91.668	2	Machined	Black-Oxide Iron	0000000	000000
H8M	109.99	40	8	1.871"	Finished	Quick Disconnect Style SH	54.1	60.45	60.45	101.854	2	Machined	Black-Oxide Iron	0000000	000000