HTD Pulleys | McMaster-Carr

Filter by

System of Measurement

Inch

Metric

For Maximum Belt Width

Pitch

Number of Teeth

Belt Trade Size

Shaft Diameter

Teeth Shape

Width

Material

Number of Flanges

Shaft Type

Idler Type

Inside Width

Mount Type

Bore Type

Pitch Diameter

Pulley Type

Diameter

Overall Width

Export Control Classification Number (ECCN)

EAR99

DFARS Specialty Metals

REACH

RoHS

79 Products

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.

Aluminum pulleys will not rust in damp or humid environments, but water left on the surface will cause them to corrode. 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.

Aluminum—Press-Fit Mount

With One Flange

With Two Flanges

Without Flanges

With One Flange

With Two Flanges

Without Flanges

For 6 mm Max. Belt Wd.
OD, mm	Number of Teeth	Pitch, mm	For Shaft Dia.	Bore Type	Inside Wd., mm	Outside Wd., mm	Overall Wd., mm	Pitch Dia., mm	Number of Flanges	Fabrication	Hub Dia., mm	Manufacturer Series		Each
13.9	16	2	5mm	Finished	7	8.2	15.5	9.68	1	Machined	13.9	Gates PowerGrip 2GT	0000000	00000
15	20	2	5mm	Finished	7	8.2	16	12.22	1	Machined	15	Gates PowerGrip 2GT	0000000	0000
18.03	16	3	3/16"	Finished	7.11	9.36	14.53	15.29	2	Machined	18.03	__	00000000	00000
20.06	18	3	1/4"	Finished	7.11	9.8	17.55	17.2	2	Machined	11.23	__	00000000	00000
22.73	20	3	1/4"	Finished	7.11	9.8	17.55	19.1	2	Machined	12.7	__	00000000	00000
26.04	24	3	1/4"	Finished	7.11	9.8	17.55	22.91	2	Machined	15.88	__	00000000	00000
29.79	28	3	1/4"	Finished	7.11	9.8	17.55	26.75	2	Machined	17.81	__	00000000	00000
33.6	32	3	1/4"	Finished	7.11	9.8	17.55	30.56	2	Machined	21.62	__	00000000	00000
37.41	36	3	1/4"	Finished	7.11	10.34	18.11	34.37	2	Machined	25.4	__	00000000	00000
41.28	40	3	1/4"	Finished	7.11	10.34	18.11	38.2	2	Machined	29.21	__	00000000	00000
For 9 mm Max. Belt Wd.
15	20	2	5mm	Finished	11	12.2	20	12.22	1	Machined	15	Gates PowerGrip 2GT	0000000	0000
18.03	16	3	3/16"	Finished	10.16	12.38	17.55	15.29	2	Machined	18.03	__	00000000	00000
20.07	18	3	1/4"	Finished	10.16	12.85	20.62	17.2	2	Machined	11.23	__	00000000	00000
22.73	20	3	1/4"	Finished	10.16	12.85	20.62	19.1	2	Machined	12.7	__	00000000	00000
26.04	24	3	1/4"	Finished	10.16	12.85	20.62	22.91	2	Machined	15.88	__	00000000	00000
27.79	16	5	1/4"	Finished	11.68	13.89	20.24	25.48	2	Machined	14.3	__	00000000	00000
29.79	28	3	1/4"	Finished	10.16	12.85	20.62	26.75	2	Machined	17.81	__	00000000	00000
31.75	18	5	1/4"	Finished	11.68	13.89	20.24	28.65	2	Machined	17.45	__	00000000	00000
33.6	32	3	1/4"	Finished	10.16	12.85	20.62	30.56	2	Machined	21.62	__	00000000	00000
34.93	20	5	1/4"	Finished	11.68	13.72	20.07	31.83	2	Machined	20.62	__	00000000	00000
37.41	36	3	1/4"	Finished	10.16	13.39	21.16	34.37	2	Machined	25.4	__	00000000	00000
41.28	24	5	1/4"	Finished	11.68	13.72	21.64	38.2	2	Machined	25.4	__	00000000	00000
41.28	40	3	1/4"	Finished	10.16	13.39	21.16	38.2	2	Machined	29.21	__	00000000	00000
47.63	28	5	1/4"	Finished	11.68	13.72	21.64	44.55	2	Machined	30.15	__	00000000	00000
53.98	32	5	1/4"	Finished	11.68	13.72	21.64	50.93	2	Machined	31.75	__	00000000	00000
56.16	36	5	5/16"	Finished	__	13.87	23.8	57.3	0	Machined	38.1	__	00000000	00000
62.51	40	5	5/16"	Finished	__	13.87	23.8	63.65	0	Machined	38.1	__	00000000	00000
For 12 mm Max. Belt Wd.
15	20	2	5mm	Finished	13	14.5	22	12.22	1	Machined	15	Gates PowerGrip 2GT	0000000	0000

Stainless Steel—Press-Fit Mount

For 15 mm Max. Belt Wd.
OD, mm	Number of Teeth	Pitch, mm	For Shaft Dia.	Bore Type	Inside Wd., mm	Outside Wd., mm	Overall Wd., mm	Pitch Dia., mm	Number of Flanges	Fabrication	Hub Dia., mm		Each
53.98	32	5	1/2"	Plain	17.78	21.34	47.63	49.784	2	Machined	39.37	0000000	0000000
58.17	34	5	1/2"	Plain	16.51	21.34	47.63	52.959	2	Machined	42.68	0000000	000000
66.37	36	5	1/2"	Plain	16.51	21.34	47.63	56.159	2	Machined	45.72	0000000	000000
For 20 mm Max. Belt Wd.
65.08	22	8	1/2"	Plain	22.35	28.58	44.45	54.66	2	Machined	41.28	0000000	000000
For 30 mm Max. Belt Wd.
65.08	22	8	1/2"	Plain	31.75	38.1	53.98	54.66	2	Machined	41.28	0000000	000000
69.85	24	8	1/2"	Plain	31.75	38.1	53.98	59.74	2	Machined	46.04	0000000	000000
74.6	26	8	1/2"	Plain	31.75	38.1	57.15	64.846	2	Machined	50.8	0000000	000000

Stainless Steel—Bushing Mount

For 15 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
67.57	40	5	1.375"	Finished	Quick Disconnect Style JA	16.51	21.34	21.34	62.509	2	Machined	0000000	0000000
For 20 mm Max. Belt Wd.
70	26	8	1.374"	Finished	Quick Disconnect Style JA	22.35	28.58	28.58	62.22	2	Machined	0000000	000000
80.17	28	8	1.625"	Finished	Split Tapered Style H	22.35	28.58	28.58	71.3	2	Machined	0000000	000000
84.94	30	8	1.625"	Finished	Split Tapered Style H	22.35	28.58	28.58	76.4	2	Machined	0000000	000000
95.25	34	8	1.871"	Finished	Quick Disconnect Style SH	22.35	28.58	28.58	86.59	2	Machined	0000000	000000
110.34	40	8	1.871"	Finished	Quick Disconnect Style SH	22.35	28.58	28.58	101.854	2	Machined	000000	000000
120.65	44	8	2.187"	Finished	Quick Disconnect Style SDS	22.35	28.58	28.58	112.04	2	Machined	0000000	000000
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.
78.49	28	8	1.625"	Finished	Split Tapered Style H	33.32	38.1	38.1	71.3	2	Machined	0000000	000000
84.94	30	8	1.625"	Finished	Split Tapered Style H	31.75	38.1	38.1	76.4	2	Machined	0000000	000000
90.48	32	8	1.625"	Finished	Split Tapered Style H	31.75	38.1	38.1	81.48	2	Machined	0000000	000000
95.25	34	8	1.871"	Finished	Quick Disconnect Style SH	31.75	38.1	38.1	86.59	2	Machined	000000	000000
110.34	40	8	1.871"	Finished	Quick Disconnect Style SH	31.75	38.1	38.1	101.854	2	Machined	0000000	000000
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
For 50 mm Max. Belt Wd.
95.25	34	8	1.871"	Finished	Quick Disconnect Style SH	53.98	60.33	60.33	86.59	2	Machined	0000000	000000
100	36	8	1.871"	Finished	Quick Disconnect Style SH	53.98	60.33	60.33	91.67	2	Machined	0000000	000000
110.34	40	8	1.871"	Finished	Quick Disconnect Style SH	53.98	60.33	60.33	101.854	2	Machined	0000000	000000

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.

Smooth pulleys have no teeth; they're used with the smooth side of the belt.

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

Toothed

For 6 mm Max. Belt Wd.
Manufacturer Series	OD	Number of Teeth	For Shaft Dia.	Dia.	Wd.	Groove Dp.	Shaft Mount Type	Bore Type	Number of Flanges	Fabrication	Material	Bearing Type		Each
Gates PowerGrip 2GT	15mm	20	3mm	12.22mm	10mm	1.39 mm	Slip Fit	Finished	2	Machined	Aluminum	Ball	00000000	00000
Gates PowerGrip 2GT	15mm	20	5mm	12.22mm	10mm	1.39 mm	Slip Fit	Finished	2	Machined	Aluminum	Ball	0000000	0000
For 9 mm Max. Belt Wd.
Gates PowerGrip 2GT	15mm	20	3mm	12.22mm	14mm	1.39 mm	Slip Fit	Finished	2	Machined	Aluminum	Ball	00000000	0000
Gates PowerGrip 2GT	15mm	20	5mm	12.22mm	14mm	1.39 mm	Slip Fit	Finished	2	Machined	Aluminum	Ball	0000000	0000
For 12 mm Max. Belt Wd.
Gates PowerGrip 2GT	15mm	20	3mm	12.22mm	16mm	1.39 mm	Slip Fit	Finished	2	Machined	Aluminum	Ball	00000000	0000
Gates PowerGrip 2GT	15mm	20	5mm	12.22mm	16mm	1.39 mm	Slip Fit	Finished	2	Machined	Aluminum	Ball	0000000	0000

Smooth

For 6 mm Max. Belt Wd.
Manufacturer Series	OD, mm	For Shaft Dia., mm	Dia., mm	Wd., mm	Groove Dp., mm	Shaft Mount Type	Bore Type	Number of Flanges	Fabrication	Material	Bearing Type		Each
Gates PowerGrip 2GT	15	3	12	10	1.5	Slip Fit	Finished	2	Machined	Aluminum	Ball	00000000	00000
Gates PowerGrip 2GT	15	5	12	10	1.5	Slip Fit	Finished	2	Machined	Aluminum	Ball	0000000	0000
For 9 mm Max. Belt Wd.
Gates PowerGrip 2GT	15	3	12	14	1.5	Slip Fit	Finished	2	Machined	Aluminum	Ball	00000000	0000
Gates PowerGrip 2GT	15	5	12	14	1.5	Slip Fit	Finished	2	Machined	Aluminum	Ball	0000000	0000
For 12 mm Max. Belt Wd.
Gates PowerGrip 2GT	15	3	12	16	1.5	Slip Fit	Finished	2	Machined	Aluminum	Ball	00000000	0000
Gates PowerGrip 2GT	15	5	12	16	1.5	Slip Fit	Finished	2	Machined	Aluminum	Ball	0000000	0000

High-Strength HTD Timing Belt Pulleys with Hex Bore

Mount these high torque drive (HTD) pulleys onto a hex shaft. They have curved teeth for greater contact with belts than trapezoidal teeth, so you can apply more torque without damaging the belt. The teeth fit together seamlessly to prevent unwanted belt movement for a smooth, quiet cycle. Made of aluminum, these pulleys won’t corrode in damp or humid environments. However, prolonged direct contact with water will cause corrosion over time.

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.

Press-Fit Mount

For 9 mm Max. Belt Wd.
OD, mm	Number of Teeth	Pitch, mm	Hex Wd.	Bore Type	Inside Wd., mm	Outside Wd., mm	Overall Wd., mm	Pitch Dia., mm	Number of Flanges	Fabrication	Material		Each
32	18	5	1/2"	Finished	10.29	13.03	14.29	28.65	2	Machined	Black-Anodized Aluminum	0000000	000000
42	24	5	1/2"	Finished	10.29	12.95	14.29	38.2	2	Machined	Black-Anodized Aluminum	0000000	00000
51	30	5	1/2"	Finished	10.29	13.03	14.29	47.75	2	Machined	Black-Anodized Aluminum	0000000	00000
60	36	5	1/2"	Finished	10.29	12.95	14.29	57.3	2	Machined	Black-Anodized Aluminum	0000000	00000
For 15 mm Max. Belt Wd.
28	15	5	1/2"	Finished	19.05	20.96	22.23	23.87	2	Machined	Black-Anodized Aluminum	0000000	00000
32	18	5	1/2"	Finished	18.23	20.96	22.23	28.65	2	Machined	Black-Anodized Aluminum	0000000	00000
42	24	5	1/2"	Finished	18.23	20.96	22.23	38.2	2	Machined	Black-Anodized Aluminum	0000000	00000
51	30	5	1/2"	Finished	18.23	20.96	22.23	47.75	2	Machined	Black-Anodized Aluminum	0000000	00000
60	36	5	1/2"	Finished	18.23	20.96	22.23	57.3	2	Machined	Black-Anodized Aluminum	0000000	00000

High-Strength HTD Cut-to-Length Timing Belts

Curved teeth made from fiberglass-reinforced neoprene make these HTD (high-torque drive) belts stronger and quieter than belts with trapezoidal teeth. Also known as curvilinear and synchronous belts, their teeth have more surface contact than trapezoidal teeth, so they stay in contact with the pulley longer. This means these belts stay tight for accuracy required in applications with precise starts and stops, such as 3D printers, machine tool drives, and robotics.

Because these belts are fiberglass-reinforced neoprene, they resist stretching over time. They are also coated in nylon to reduce wear and improve grip.

These belts do not require end plates. Cut them to the length you need and attach them directly to your printer head or other equipment.

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

6 mm Wd.
Belt Trade Number	Manufacturer Equivalent Number	Pitch, mm	Material	Color	Temperature Range, °F		500 mm Lg.	1,000 mm Lg.	2,000 mm Lg.	3,000 mm Lg.
LL2MR06	Gates PowerGrip 2GT	2	Neoprene	Black	-30° to 175°	000000	00000	000000	000000	000000
9 mm Wd.
LL2MR09	Gates PowerGrip 2GT	2	Neoprene	Black	-30° to 175°	000000	0000	00000	00000	00000
12 mm Wd.
LL2MR12	Gates PowerGrip 2GT	2	Neoprene	Black	-30° to 175°	000000	00000	00000	00000	00000