20 Degree Gears | McMaster-Carr

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	Pressure Angle Pressure Angle	Show

20°

	Pressure Angle Pressure Angle	Hide

14 1/2°

20°

	Component Component


Gear	Gear Rack

Worm	Gear Stock

Internal Gear	Shaft-Mounted Worm

	System of Measurement System of Measurement

Inch

Metric

	For Shaft Diameter For Shaft Diameter

	Number of Teeth Number of Teeth

10
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
28
30
32
34
35
36
38
40
42
44
45
48
50
55
56
60
64
70
72
75
76
80
90
96
100
120
128

	OD OD

	Gear Pitch Diameter Gear Pitch Diameter

	Material Material

	Gear Type Gear Type

	Module Module

	Face Width Face Width

	Gear Pitch Gear Pitch

6
8
10
12
16
18
20
24
32
48
64

	Bore Type Bore Type


Round	Machinable

Keyed	Clamping

	Overall Width Overall Width

	Overall Length Overall Length

	Hub Diameter Hub Diameter

	Hub Width Hub Width

	Teeth Heat Treatment Teeth Heat Treatment

Not Hardened

Hardened

	Speed Ratio Speed Ratio

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

DFARS Specialty Metals
COTS-Exempt

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

RoHS Compliant with
Exemptions

	For Shaft Angle For Shaft Angle


45°	60°

90°	120°

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

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About Gears

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 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.

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.

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.

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.

Gear Rod Stock

Machine your own gears to fit the exact face width and shaft diameter required.