34 Teeth Sprockets | McMaster-Carr

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	Roller Chain Trade Size Roller Chain Trade Size

	Number of Teeth Number of Teeth	Show

	Number of Teeth Number of Teeth	Hide

6
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128
130

	System of Measurement System of Measurement

Inch

Metric

	For Shaft Diameter For Shaft Diameter

	Pitch Pitch

	OD OD

	ID ID

	Material Material

	For Shaft Type For Shaft Type

Keyed

	Bore Type Bore Type


Finished	Round

Plain

	For Maximum Belt Width For Maximum Belt Width

	Hub Diameter Hub Diameter

	Overall Width Overall Width

	Shaft Mount Type Shaft Mount Type

Set Screw

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	For Roller Chain Strand Type For Roller Chain Strand Type

	Single

	Keyway Depth Keyway Depth

	Roller Chain Standard Roller Chain Standard

ANSI

	Keyway Width Keyway Width

	Sprocket Type Sprocket Type

Standard

	Mount Type Mount Type


Press Fit	Bushing

	For Belt Trade Size For Belt Trade Size

	Teeth Shape Teeth Shape

	Trapezoidal
	Curved

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46 Products

About Roller Chain and Sprockets

About Gears

Sprockets for ANSI Roller Chain

Mount these sprockets onto your shaft and secure with a set screw—no machining necessary.

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

For ANSI 40 Roller Chain (1/2" Pitch)

					Keyway
Number of Teeth	For Shaft Dia.	OD	Overall Wd.	Hub Dia.	Wd.	Dp.	Material	Includes		Each
34	5/8"	5.7"	1"	3 1/4"	3/16"	3/32"	Steel	Two Set Screws	00000000	000000
34	3/4"	5.7"	1"	3 1/4"	3/16"	3/32"	Steel	Two Set Screws	00000000	00000
34	7/8"	5.7"	1"	3 1/4"	3/16"	3/32"	Steel	Two Set Screws	00000000	00000
34	1"	5.7"	1"	3 1/4"	1/4"	1/8"	Steel	Two Set Screws	00000000	00000
34	1 1/8"	5.7"	1"	3 1/4"	1/4"	1/8"	Steel	Two Set Screws	00000000	00000
34	1 3/16"	5.7"	1"	3 1/4"	1/4"	1/8"	Steel	Two Set Screws	00000000	00000
34	1 1/4"	5.7"	1"	3 1/4"	1/4"	1/8"	Steel	Two Set Screws	00000000	00000
34	1 3/8"	5.7"	1"	3 1/4"	5/16"	5/32"	Steel	Two Set Screws	00000000	00000
34	1 7/16"	5.7"	1"	3 1/4"	3/8"	3/16"	Steel	Two Set Screws	00000000	00000
34	1 1/2"	5.7"	1"	3 1/4"	3/8"	3/16"	Steel	Two Set Screws	00000000	00000

For ANSI 50 Roller Chain (5/8" Pitch)

					Keyway
Number of Teeth	For Shaft Dia.	OD	Overall Wd.	Hub Dia.	Wd.	Dp.	Material	Includes		Each
34	3/4"	7.12"	1 1/4"	3 1/4"	3/16"	3/32"	Steel	Two Set Screws	00000000	000000
34	7/8"	7.12"	1 1/4"	3 1/4"	3/16"	3/32"	Steel	Two Set Screws	00000000	00000
34	1"	7.12"	1 1/4"	3 1/4"	1/4"	1/8"	Steel	Two Set Screws	00000000	00000
34	1 1/8"	7.12"	1 1/4"	3 1/4"	1/4"	1/8"	Steel	Two Set Screws	00000000	00000
34	1 3/16"	7.12"	1 1/4"	3 1/4"	1/4"	1/8"	Steel	Two Set Screws	00000000	00000
34	1 1/4"	7.12"	1 1/4"	3 1/4"	1/4"	1/8"	Steel	Two Set Screws	00000000	00000
34	1 3/8"	7.12"	1 1/4"	3 1/4"	5/16"	5/32"	Steel	Two Set Screws	00000000	00000
34	1 7/16"	7.12"	1 1/4"	3 1/4"	3/8"	3/16"	Steel	Two Set Screws	00000000	00000
34	1 1/2"	7.12"	1 1/4"	3 1/4"	3/8"	3/16"	Steel	Two Set Screws	00000000	00000
34	1 5/8"	7.12"	1 1/4"	3 1/4"	3/8"	3/16"	Steel	Two Set Screws	00000000	00000
34	1 3/4"	7.12"	1 1/4"	3 1/4"	3/8"	3/16"	Steel	Two Set Screws	00000000	00000
34	1 15/16"	7.12"	1 1/4"	3 1/4"	1/2"	1/4"	Steel	Two Set Screws	00000000	00000

For ANSI 60 Roller Chain (3/4" Pitch)

					Keyway
Number of Teeth	For Shaft Dia.	OD	Overall Wd.	Hub Dia.	Wd.	Dp.	Material	Includes		Each
34	1"	8.54"	1 1/4"	4"	1/4"	1/8"	Steel	Two Set Screws	00000000	0000000
34	1 1/8"	8.54"	1 1/4"	4"	1/4"	1/8"	Steel	Two Set Screws	00000000	000000
34	1 3/16"	8.54"	1 1/4"	4"	1/4"	1/8"	Steel	Two Set Screws	00000000	000000
34	1 1/4"	8.54"	1 1/4"	4"	1/4"	1/8"	Steel	Two Set Screws	00000000	000000
34	1 3/8"	8.54"	1 1/4"	4"	5/16"	5/32"	Steel	Two Set Screws	00000000	000000
34	1 7/16"	8.54"	1 1/4"	4"	3/8"	3/16"	Steel	Two Set Screws	00000000	000000
34	1 1/2"	8.54"	1 1/4"	4"	3/8"	3/16"	Steel	Two Set Screws	00000000	000000
34	1 5/8"	8.54"	1 1/4"	4"	3/8"	3/16"	Steel	Two Set Screws	00000000	000000
34	1 3/4"	8.54"	1 1/4"	4"	3/8"	3/16"	Steel	Two Set Screws	00000000	000000
34	1 15/16"	8.54"	1 1/4"	4"	1/2"	1/4"	Steel	Two Set Screws	00000000	000000

Timing Belt Idler Pulleys

Add these free-spinning pulleys to your timing belt setup to minimize vibration and keep belts from wearing out. The needle bearing at the center of these pulleys is lined with small, cylindrical rollers that reduce friction as they rotate. This bearing allows both the pulley and the shaft it’s mounted on to spin independently. Made from iron or steel, these pulleys are strong and wear-resistant. The black oxide coating protects the pulleys from corrosion in dry environments.

Trapezoidal teeth on the outside of the pulley fit into teeth inside your timing belt—select a pulley that matches your belt trade size. The maximum belt width should be the same size or larger than the width of your timing belt.

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

Metric—Press-Fit Mount

With Two Flanges

With Two Flanges and a Hub

For GT Belt Trade Size
For Max. Belt Wd., mm	OD, mm	Number of Teeth	Pitch, mm	For Shaft Dia., mm	Dia., mm	Bore Type	Inside Wd., mm	Outside Wd., mm	Overall Wd., mm	Pitch Dia., mm	Number of Flanges	Fabrication	Material	Bearing Type	Hub Dia., mm		Each
55	164	34	14	50	148.72	Plain	55	110	110	151.51	2	Machined	Black-Oxide Iron	Needle Roller	123.95	0000000	0000000
For GT2 Belt Trade Size
68	164	34	14	50	148.72	Plain	68	110	110	151.51	2	Machined	Black-Oxide Iron	Needle Roller	123.95	0000000	000000
90	164	34	14	50	148.72	Plain	90	132	132	151.51	2	Machined	Black-Oxide Iron	Needle Roller	123.95	0000000	000000
125	164	34	14	50	148.72	Plain	125	171	171	151.51	2	Machined	Black-Oxide Iron	Needle Roller	123.95	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 15 mm Max. Belt Wd.
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
60.46	34	5	1/2"	1"	Plain	16.51	21.34	34.04	54.102	2	Machined	Zinc-Plated Steel	42.67	0000000	000000

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	Material		Each
97.03	34	8	1.871"	Finished	Quick Disconnect Style SH	22.35	28.7	28.7	86.588	2	Machined	Zinc-Plated Steel	00000000	000000
For 30 mm Max. Belt Wd.
97.03	34	8	1.871"	Finished	Quick Disconnect Style SH	31.88	38.23	38.23	86.588	2	Machined	Zinc-Plated Steel	00000000	00000
For 50 mm Max. Belt Wd.
97.03	34	8	1.871"	Finished	Quick Disconnect Style SH	54.1	60.45	60.45	86.588	2	Machined	Zinc-Plated Steel	0000000	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 (not included).

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

Stainless Steel—Press-Fit Mount

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
58.17	34	5	1/2"	Plain	16.51	21.34	47.63	52.959	2	Machined	42.68	0000000	0000000

Stainless Steel—Bushing Mount

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
95.25	34	8	1.871"	Finished	Quick Disconnect Style SH	22.35	28.58	28.58	85.217	2	Machined	0000000	0000000
For 30 mm Max. Belt Wd.
95.25	34	8	1.871"	Finished	Quick Disconnect Style SH	31.75	38.1	38.1	85.217	2	Machined	000000	000000
For 50 mm Max. Belt Wd.
95.25	34	8	1.871"	Finished	Quick Disconnect Style SH	53.98	60.33	60.33	85.217	2	Machined	0000000	000000

High-Strength GT Timing Belt Pulleys

For higher speed or higher torque applications, these GT series timing belt pulleys provide a more precise fit than HTD pulleys. Use them where accuracy is critical, such as in storage and retrieval systems or in robotics. Similar to HTD timing belt pulleys, their teeth are curved for high strength. The curved teeth create positive grip engagement with timing belts, so these pulleys do not require re-tensioning—unlike drives using V-belts or sheaves. And unlike chain drives, there’s no metal-on-metal contact, so these pulleys don’t require lubrication.

Anodized aluminum pulleys are lightweight and resist corrosion. They have a finished bore and come with set screws for mounting on shafts.

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

Press-Fit Mount

With Hub—Two Flanges

For 9 mm Maximum Belt Width
Number of Teeth	Pitch, mm	For Shaft Diameter	Bore Type	Inside Width, mm	Outside Width, mm	Overall Width, mm	Pitch Diameter, mm	Number of Flanges	Fabrication	Material	Hub Diameter, mm		Each
34	3	1/4"	Finished	10.16	13.46	21.16	32.461	2	Machined	Anodized Aluminum	23.39	00000000	000000

Metal Gears and Gear Racks—20° Pressure Angle

The current industry standard, these 20° pressure angle gears have thicker, stronger teeth than 14½° pressure angle gears. Compared to plastic gears and racks, they’re better for high-load, high-speed, and heavy duty applications. Also known as spur gears.

Combine gears with different numbers of teeth to change speed and torque in your assembly. Combine a gear and rack to convert rotary motion into linear motion. To minimize your footprint, mount one or more standard gears inside of an internal gear.

For components to mesh correctly, they must have the same pressure angle and pitch/module.

Carbon steel components have hard, strong, and wear-resistant teeth, although they will rust when exposed to moisture and corrosive chemicals. They're best for high-torque machines, like lifting equipment, and heavy duty applications, such as rock crushing. Gears with teeth that are not hardened can be hardened to fit your application.

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

Metric Gears

Gear with Round Bore

									Hub
Module	Number of Teeth	Gear Pitch Dia., mm	OD, mm	Face Wd., mm	Overall Wd., mm	For Shaft Dia., mm	Material	Teeth Heat Treatment	Dia., mm	Wd., mm		Each
Round Bore
1	34	34	36	10	20	10	Black-Oxide 1045 Carbon Steel	Not Hardened	26	10	00000000	000000