Metric Gears | McMaster-Carr

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	Component Component


Gear	Gear Rack

Worm	Internal Gear

Shaft-Mounted Worm	Pawl

	System of Measurement System of Measurement	Show

Metric

	System of Measurement System of Measurement	Hide

Inch

Metric

	Module Module

	For Shaft Diameter For Shaft Diameter

	Number of Teeth Number of Teeth

8
9
10
11
12
13
14
15
16
17
18
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20
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24
25
26
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28
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68
70
72
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76
80
84
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90
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100
110
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114
120
130
160
200

	Gear Type Gear Type

	Material Material

	OD OD

	Face Width Face Width

	Bore Type Bore Type

	Pressure Angle Pressure Angle

14 1/2°

20°

	Gear Pitch Diameter Gear Pitch Diameter

	Hub Diameter Hub Diameter

	Overall Width Overall Width

	Overall Length Overall Length

	Speed Ratio Speed Ratio

	Hub Width Hub Width

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

DFARS Specialty Metals
COTS-Exempt

	Teeth Heat Treatment Teeth Heat Treatment

Not Hardened

Hardened

	Gear Rack Shape Gear Rack Shape


Rectangular	Round

	Number of Thread Starts Number of Thread Starts

	Fabrication Fabrication

Molded

Machined

Cast

	For Shaft Angle For Shaft Angle


45°	60°

90°	120°

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3,165 Products

Metal Gears and Gear Racks

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. They're also known as spur gears.

High-Power Metal Gears

For smooth, quiet operation at high speeds under heavy loads, helical gears have curved teeth that engage gradually and stay in contact longer than straight teeth.

Metal Worms and Worm Gears

Worm gears use screw threads to reduce shaft speed by ratios of 10:1 and greater while transmitting motion at a right angle.

Metal Miter Gears

With straight, conically shaped teeth and a 1:1 speed ratio, miter gears connect two shafts at a right angle without changing shaft speed or torque. They're more efficient than spiral miter gears because they create less friction.

Metal Bevel Gears

A type of miter gear where one gear is smaller than the other, bevel gears provide right-angle speed reduction at ratios ranging from 2:1 to 5:1. They’re more efficient than worm gears because they create less friction.

High-Power Metal Bevel Gears

Made from carbon steel with spiral teeth, these gears handle heavier loads at higher speeds than bevel gears with straight teeth because their teeth stay in contact longer.

High-Power Metal Miter Gears

Also known as spiral miter gears, these gears have curved teeth that gradually engage and stay in contact longer than straight teeth so they handle heavier loads at higher speeds. Speed ratio is 1:1.

Plastic Gears and Gear Racks

Plastic Gears and Gear Racks—20° Pressure Angle

The current industry standard, gears with a 20° pressure angle have thicker, stronger teeth than gears with a 14½° pressure angle.

High-Power Plastic Gears

Transmitting loads at higher speeds than spur gears in environments where rusting and exposure to chemicals is a concern, these plastic gears have helical teeth, which stay in contact longer than straight teeth. They’re often called screw or crossed-helical gears.

Plastic Worm Gears

These plastic gears are lighter and quieter than metal gears—pair them with metal worms for lubrication-free operation. Worm gears use screw threads to make large reductions to shaft speed while transmitting motion at a right angle.

Plastic Miter Gears

Connect two shafts at a right angle without changing shaft speed or torque.

Plastic Bevel Gears

Reduce speeds where noise, corrosion, and frequent lubrication are a concern. Compared to metal gears, these nylon gears run more quietly, won't rust, and don't need to be lubricated.

Metal Ratcheting Gears

Compared to plastic gears, metal gears are better for high-load, high-speed, and heavy duty applications.

Sprockets

Flat Sprockets for Metric Roller Chain

With metric teeth and slim profile, these sprockets allow your ISO roller chain to reach narrow spaces. They're commonly referred to as A-plate sprockets.

Sprockets for Metric Roller Chain

Designed to meet ISO 606 and DIN 8187 international dimensional standards, these sprockets are for use with compatible ISO and DIN roller chain.

Machinable-Bore Corrosion-Resistant
Sprockets for Metric Roller Chain

Machine the center of these sprockets to fit the exact dimensions of your shaft. The teeth are sized to fit into metric ISO roller chain.

Sprockets for Double-Strand Metric Roller Chain

The double row of teeth on these sprockets are designed to fit into metric ISO double-strand roller chain.

Idler Sprockets for Metric Roller Chain

Keep constant tension on your drive with these sprockets that press against your metric ISO roller chain to take up slack and reduce wear and vibration.

Taper-Lock Bushing-Bore
Sprockets for Metric Roller Chain

While their teeth fit into metric ISO roller chain, these sprockets use taper-lock bushings to grip shafts.

Flat Taper-Lock Bushing-Bore Sprockets
for Double-Strand Metric Roller Chain

With a slim profile and a double row of teeth, these sprockets allow your metric ISO double-strand roller chain to fit into tight spaces. They’re often called A-plate sprockets.

Timing Belts and Pulleys

XL Series Corrosion-Resistant Timing Belt Pulleys

Pulleys are anodized aluminum, which is more corrosion resistant than steel.

XL Series Lightweight Timing Belt Pulleys

Acetal and aluminum construction makes these pulleys useful in for weight-sensitive applications.

MXL Series Corrosion-Resistant Timing Belt Pulleys

Anodized aluminum has good corrosion resistance.

MXL Series Lightweight Timing Belt Pulleys

Made from polycarbonate, these pulleys are useful in applications with weight constraints.

L Series Corrosion-Resistant Timing Belt Pulleys

Pulleys are anodized aluminum, which is more corrosion resistant than steel.

AT Series Timing Belt Pulleys

Made of aluminum, these pulleys have good corrosion resistance.

T Series Timing Belt Pulleys

Made of aluminum, these pulleys have good corrosion resistance.

Timing Belt Idler Pulleys

Add these free-spinning pulleys to your timing belt setup to minimize vibration and keep belts from wearing out.

High-Strength Timing Belts and Pulleys

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.

High-Strength HTD Timing Belt Pulleys

These HTD (high torque drive) pulleys have a curved tooth shape that provides higher strength than trapezoidal teeth.

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 to remove slack from timing belts.

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.

Ultra-High-Strength Poly Chain Timing Belt Pulleys

Curved teeth with a high pitch provide superior load distribution and reduce wear. They mount with a bushing for a more secure grip on the shaft than set screws.

Metal Gears and Gear Racks

Metal Gears and Gear Racks—20° Pressure Angle

High-Power Metal Gears

Metal Worms and Worm Gears

Metal Miter Gears

Metal Bevel Gears

High-Power Metal Bevel Gears

High-Power Metal Miter Gears

Plastic Gears and Gear Racks

Plastic Gears and Gear Racks—20° Pressure Angle

High-Power Plastic Gears

Plastic Worm Gears

Plastic Miter Gears

Plastic Bevel Gears

Metal Ratcheting Gears

Metal Ratcheting Gears

Sprockets

Flat Sprockets for Metric Roller Chain

Sprockets for Metric Roller Chain

Machinable-Bore Corrosion-ResistantSprockets for Metric Roller Chain

Sprockets for Double-Strand Metric Roller Chain

Idler Sprockets for Metric Roller Chain

Taper-Lock Bushing-BoreSprockets for Metric Roller Chain

Flat Taper-Lock Bushing-Bore Sprocketsfor Double-Strand Metric Roller Chain

Timing Belts and Pulleys

XL Series Corrosion-Resistant Timing Belt Pulleys

XL Series Lightweight Timing Belt Pulleys

MXL Series Corrosion-Resistant Timing Belt Pulleys

MXL Series Lightweight Timing Belt Pulleys

L Series Corrosion-Resistant Timing Belt Pulleys

AT Series Timing Belt Pulleys

T Series Timing Belt Pulleys

Timing Belt Idler Pulleys

High-Strength Timing Belts and Pulleys

High-Strength Corrosion-ResistantHTD Timing Belt Pulleys

High-Strength HTD Timing Belt Pulleys

High-Strength HTD Timing Belt Idler Pulleys

High-Strength Ultra-Quiet Timing Belt Pulleys

Ultra-High-Strength Poly Chain Timing Belt Pulleys

Machinable-Bore Corrosion-Resistant
Sprockets for Metric Roller Chain

Taper-Lock Bushing-Bore
Sprockets for Metric Roller Chain

Flat Taper-Lock Bushing-Bore Sprockets
for Double-Strand Metric Roller Chain

High-Strength Corrosion-Resistant
HTD Timing Belt Pulleys