Gear Racks | McMaster-Carr

	Component Component


Gear Rack	Gear

Internal Gear

	Gear Pitch Gear Pitch

6
8
10
12
16
20
24
32
48
64

	System of Measurement System of Measurement

Inch

Metric

	Face Width Face Width

	Gear Rack Shape Gear Rack Shape


Rectangular	Round

	Length Length

	Material Material

	Pressure Angle Pressure Angle

14 1/2°

20°

	Height Height

	Gear Type Gear Type


Spur	Helical

	Pitch Height Pitch Height

	Module Module

	For Shaft Diameter For Shaft Diameter

	Number of Teeth Number of Teeth

11
12
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
52
55
56
60
62
64
70
72
75
76
80
84
90
96
100
120
128

	Teeth Heat Treatment Teeth Heat Treatment

Not Hardened

Hardened

	Gear Pitch Diameter Gear Pitch Diameter

	OD OD

	Bore Type Bore Type


Round	Machinable

Keyed	Clamping

	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

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

REACH Compliant

	Overall Width Overall Width

	Hub Diameter Hub Diameter

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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.

Metal Gears and Gear Racks—14 1/2° Pressure Angle

A former industry standard, 14½° pressure angle gears are often found on older machinery.

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.

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 Gears and Gear Racks—14 1/2° Pressure Angle

A former industry standard, 14½° pressure angle gears are often found on older machinery.