2.187" ID Sprockets | McMaster-Carr

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28 Products

H Series Quick-Disconnect Timing Belt Pulleys

Move heavy loads without slippage—pulleys mount with quick-disconnect (QD) bushings (sold separately) for a more secure grip on the shaft than set screws. Bushing is not included. Pulleys are H series (heavy) and have trapezoidal teeth. Select a pulley with a maximum belt width that’s the same or larger than your timing belt width.

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

Bushing Mount

With Two Flanges

For 1" Max. Belt Wd.
OD	Number of Teeth	Pitch	ID	Bore Type	For Bushing Style	Inside Wd.	Outside Wd.	Overall Wd.	Pitch Dia.	Number of Flanges	Fabrication	Material		Each
3.74"	22	0.500"	2.187"	Finished	Quick Disconnect Style SDS	1.063"	1.313"	1.313"	3.501"	2	Sintered	Steel	00000000	000000
4.06"	24	0.500"	2.187"	Finished	Quick Disconnect Style SDS	1.063"	1.313"	1.313"	3.82"	2	Sintered	Steel	00000000	00000
4.38"	26	0.500"	2.187"	Finished	Quick Disconnect Style SDS	1.063"	1.313"	1.313"	4.138"	2	Sintered	Steel	00000000	000000
4.7"	28	0.500"	2.187"	Finished	Quick Disconnect Style SDS	1.063"	1.313"	1.313"	4.456"	2	Sintered	Steel	00000000	000000
5.02"	30	0.500"	2.187"	Finished	Quick Disconnect Style SD	1.063"	1.313"	1.313"	4.775"	2	Cast	Iron	00000000	000000
For 1 1/2" Max. Belt Wd.
3.74"	22	0.500"	2.187"	Finished	Quick Disconnect Style SD	1.563"	1.813"	1.813"	3.501"	2	Sintered	Steel	00000000	000000
4.06"	24	0.500"	2.187"	Finished	Quick Disconnect Style SD	1.563"	1.813"	1.813"	3.82"	2	Sintered	Steel	00000000	000000
4.38"	26	0.500"	2.187"	Finished	Quick Disconnect Style SD	1.563"	1.813"	1.813"	4.138"	2	Sintered	Steel	00000000	000000
4.7"	28	0.500"	2.187"	Finished	Quick Disconnect Style SD	1.563"	1.813"	1.813"	4.456"	2	Sintered	Steel	00000000	000000
5.02"	30	0.500"	2.187"	Finished	Quick Disconnect Style SD	1.563"	1.813"	1.813"	4.775"	2	Cast	Iron	00000000	000000
For 2" Max. Belt Wd.
3.735"	22	0.500"	2.187"	Finished	Quick Disconnect Style SD	2.094"	2.344"	2.344"	3.501"	2	Machined	Black-Oxide Iron	00000000	000000
4.05"	24	0.500"	2.187"	Finished	Quick Disconnect Style SD	2.094"	2.344"	2.344"	3.82"	2	Machined	Black-Oxide Iron	00000000	000000
4.369"	26	0.500"	2.187"	Finished	Quick Disconnect Style SD	2.094"	2.344"	2.344"	4.138"	2	Machined	Black-Oxide Iron	00000000	000000
4.687"	28	0.500"	2.187"	Finished	Quick Disconnect Style SD	2.094"	2.344"	2.344"	4.456"	2	Machined	Black-Oxide Iron	00000000	000000
5"	30	0.500"	2.187"	Finished	Quick Disconnect Style SD	2.094"	2.344"	2.344"	4.775"	2	Machined	Black-Oxide Iron	00000000	000000

High-Strength Corrosion-Resistant HTD Timing Belt Pulleys

Move belts forward and backward or stop and start them in precise positions, especially in areas where rust is a concern. The curved teeth on these high-torque drive (HTD) pulleys have more surface contact with belts than traditional trapezoidal teeth, which allows you to apply more torque without damaging belts. These teeth fit together seamlessly to prevent backlash, or unwanted movement of the belt on the pulley, for a smooth, quiet cycle. These pulleys are often used in 3D printing, machine tool drives, robotics, and other applications where precision is essential. They are also known as curvilinear belt pulleys.

Pair pulleys with an HTD timing belt that has the same pitch. The width of your belt should not be larger than the maximum belt width listed.

Stainless steel pulleys can be wetted repeatedly without rusting or staining.

Bushing-mount pulleys grip the shaft more securely than press-fit pulleys, but require a quick-disconnect (QD) bushing or a split-tapered bushing (not included).

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

Stainless Steel—Bushing Mount

For 20 mm Max. Belt Wd.
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		Each
120.65	44	8	2.187"	Finished	Quick Disconnect Style SDS	22.35	28.58	28.58	112.04	2	Machined	0000000	0000000
130.99	48	8	2.187"	Finished	Quick Disconnect Style SDS	22.35	28.58	28.58	122.22	2	Machined	0000000	000000
150.8	56	8	2.187"	Finished	Quick Disconnect Style SDS	22.35	28.58	28.58	141.224	2	Machined	0000000	000000
For 30 mm Max. Belt Wd.
120.65	44	8	2.187"	Finished	Quick Disconnect Style SDS	31.75	38.1	38.1	112.04	2	Machined	0000000	000000
130.99	48	8	2.187"	Finished	Quick Disconnect Style SDS	31.75	38.1	38.1	122.22	2	Machined	0000000	000000
150.8	56	8	2.187"	Finished	Quick Disconnect Style SDS	31.75	38.1	38.1	142.6	2	Machined	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.

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.

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	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	000000
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	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

High-Strength Ultra-Quiet Timing Belt Pulleys

Teeth are curved and set in an offset pattern for high strength with 25% less operating noise than pulleys and belts with trapezoidal teeth. Select a pulley with a maximum belt width that’s the same or larger than your timing belt width.

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.

Bushing Mount

For 32 mm Max. Belt Wd.
OD, mm	Number of Teeth	Pitch, mm	ID	Bore Type	For Bushing Style	Outside Wd., mm	Overall Wd., mm	Pitch Dia., mm	Fabrication	Material		Each
120.91	48	8	2.187"	Finished	Quick Disconnect Style SDS	33	33	122	Cast	Magnesium-Phosphate-Coated Iron	0000000	0000000