Internal Gears | McMaster-Carr

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Gear Module

0.5

1.5

System of Measurement

Gear Pitch Diameter

Number of Teeth

Face Width

Material

Gear Pitch

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

REACH

Compliant

DFARS Specialty Metals

Exempt

RoHS

Compliant

Export Control Classification Number (ECCN)

EAR99

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About Gears

Compare gear types, measure pitch and module, calculate mounting distance, increase speed or torque, and more.

Metal Internal Spur Gears

Save space without losing power. Insert a standard spur gear inside one of these gears for a compact assembly that smoothly transmits motion. These gears have teeth with a 20° pressure angle, the current industry standard. 20° pressure angle gears have thicker, stronger teeth than 14½° pressure angle gears.

Combine gears with different numbers of teeth to change speed and torque in your assembly. For components to mesh correctly, they must have the same pressure angle and pitch/module.

Steel—Steel gears have strong and wear-resistant teeth, although they will rust when exposed to moisture and corrosive chemicals.

Brass—Brass gears are easy to machine, so you can add your own mounting holes and make other alterations. They won't rust when exposed to water.

	Gear Pitch Dia.	OD	ID	Face Wd.	Tooth Heat Treatment	Material		Each
20° Pressure Angle







	Steel

	—	0.5	60	30 mm	50 mm	29 mm	5 mm	Not Hardened	Black-Oxide 1045 Carbon Steel	2696N16	000000


	—	0.5	100	50 mm	70 mm	49 mm	5 mm	Not Hardened	Black-Oxide 1045 Carbon Steel	2696N15	00000
	—	1	60	60 mm	90 mm	58 mm	10 mm	Not Hardened	Black-Oxide 1045 Carbon Steel	2696N27	00000
	—	1	100	100 mm	130 mm	98 mm	10 mm	Not Hardened	Black-Oxide 1045 Carbon Steel	2696N26	000000
	—	1.5	100	150 mm	190 mm	147 mm	15 mm	Not Hardened	Black-Oxide 1045 Carbon Steel	2696N22	000000
	—	2	100	200 mm	250 mm	196 mm	20 mm	Not Hardened	Black-Oxide 1045 Carbon Steel	2696N33	000000




			Brass

			32	—	64	2"	2.75"	1.961"	3/16"	—	Brass	2696N5	000000


			32	—	96	3"	3.75"	2.961"	3/16"	—	Brass	2696N6	000000
			32	—	128	4"	4.75"	3.961"	3/16"	—	Brass	2696N7	000000
			24	—	72	3"	3.75"	2.95"	1/4"	—	Brass	2696N3	000000