Helical Gear Boxes | McMaster-Carr

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Speed Ratio

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Output Shaft Type

Shaft Orientation

System of Measurement

Maximum Output Speed

1,000 rpm to 1,999 rpm

2,000 rpm or greater

Input Shaft Diameter

1/4"

1/2"

Output Shaft Diameter

Maximum Input Power

Number of Output Shafts

Maximum Input Speed

Output Shaft Length

Gear Type

Maximum Output Torque @ Input Speed

240 in·lbf @ 1,750 rpm

265 in·lbf @ 1,750 rpm

345 in·lbf @ 1,750 rpm

743 in·lbf @ 1,750 rpm

797 in·lbf @ 1,750 rpm

867 in·lbf @ 1,750 rpm

Material

Component

Input Shaft Rotation

Shaft Diameter

Gear Box Input Connection

Power

Gear Box Output Connection

REACH

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

Export Control Classification Number (ECCN)

EAR99

DFARS Specialty Metals

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42 Products

Speed Reducers for Position- and Speed-Control Motors

Pair these speed reducers with stepper and servo motors in position- and speed-control applications. Helical gears provide exact positioning and smoother travel than our other speed reducers. Attach to a motor to transmit motion parallel to the motor shaft while reducing speed and increasing torque.

With 1 Output Shaft

Image of Product. Front orientation. Gear Boxes. Speed Reducers for Position- and Speed-Control Motors.

IP65 Enclosure Rating—They meet IP65 for protection from washdowns.

Radial Load Capacity—Radial loads are loads that are perpendicular to the shaft. They’re commonly caused by components attached to shaft, such as pulleys and sprockets.

	Max. Output		Max. Input			Output Shaft		Overall
	Torque	Speed, rpm	Speed, rpm	Power, hp	For Input Shaft Dia.	Dia.	Lg.	Lg.	Wd.	Ht.	Radial Load Cap., lb.	Enclosure Rating		Each
For NEMA 23 Motor Frames







				3:1 Speed Ratio

				240 in·lbf @ 1,750 rpm	2,000	6,000	2.89	1/4"	0.38"	1"	4 1/2"	2 1/2"	2 1/2"	348	IP65	64815K41	000000000




						5:1 Speed Ratio

						345 in·lbf @ 1,750 rpm	1,200	6,000	3.24	1/4"	0.38"	1"	4 1/2"	2 1/2"	2 1/2"	348	IP65	64815K42	00000000




								10:1 Speed Ratio

								265 in·lbf @ 1,750 rpm	600	6,000	1.45	1/4"	0.38"	1"	4 1/2"	2 1/2"	2 1/2"	348	IP65	64815K43	00000000




										20:1 Speed Ratio

										345 in·lbf @ 1,750 rpm	300	6,000	1.08	1/4"	0.38"	1"	5 3/4"	2 1/2"	2 1/2"	348	IP65	64815K44	00000000




												50:1 Speed Ratio

												345 in·lbf @ 1,750 rpm	120	6,000	0.46	1/4"	0.38"	1"	5 3/4"	2 1/2"	2 1/2"	348	IP65	64815K45	00000000


												For NEMA 34 Motor Frames







																3:1 Speed Ratio

																743 in·lbf @ 1,750 rpm	1,833	5,500	6.75	1/2"	1/2"	1.25"	5 1/4"	3 1/2"	3 1/2"	630	IP65	64815K51	00000000




																		5:1 Speed Ratio

																		867 in·lbf @ 1,750 rpm	1,100	5,500	5.73	1/2"	1/2"	1.25"	5 1/4"	3 1/2"	3 1/2"	630	IP65	64815K52	00000000




																				10:1 Speed Ratio

797 in·lbf @ 1,750 rpm																				550	5,500	3.04	1/2"	1/2"	1.25"	5 1/4"	3 1/2"	3 1/2"	630	IP65	64815K53	00000000




		20:1 Speed Ratio

		867 in·lbf @ 1,750 rpm	275																	5,500	1.97	1/2"	1/2"	1.25"	7"	3 1/2"	3 1/2"	630	IP65	64815K54	00000000




																				50:1 Speed Ratio

				867 in·lbf @ 1,750 rpm	110															5,500	0.87	1/2"	1/2"	1.25"	7"	3 1/2"	3 1/2"	630	IP65	64815K55	00000000

High-Power Metal Helical Gears

The helical teeth on these gears stay in contact longer than straight teeth, which allows them to transmit higher loads at higher speeds than spur gears.

Crossed Gears

Crossed helical gears, also known as screw gears, can be configured to transmit motion at a 90° angle or in a straight line. To transmit motion at a 90° angle, pair two gears with the same tooth direction. To transmit motion in a straight line, make sure to get one left-hand and one right-hand gear.

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

								Hub				Keyway				Left-Hand Teeth		Right-Hand Teeth
	Gear Pitch	Gear Module	No. of Teeth	Helix Angle	Gear Pitch Dia.	OD	Face Wd.	Dia.	Wd.	Bore Type	For Shaft Dia.	Wd.	Dp.	Material	Tooth Heat Treatment		Each		Each
20° Pressure Angle



		—	1	13	45°	18.4 mm	20.38 mm	10 mm	15 mm	10 mm	Round Bore	6 mm	—	—	Black-Oxide 1045 Carbon Steel	Not Hardened	3598N289	000000	3598N291	000000


		—	1	26	45°	36.8 mm	38.77 mm	10 mm	30 mm	10 mm	Round Bore	10 mm	—	—	Black-Oxide 1045 Carbon Steel	Not Hardened	3598N296	00000	3598N297	00000
		—	1	30	45°	42.4 mm	44.43 mm	10 mm	35 mm	10 mm	Round Bore	10 mm	—	—	Black-Oxide 1045 Carbon Steel	Not Hardened	3598N298	00000	3598N299	00000
		—	1.5	10	45°	21.2 mm	24.21 mm	15 mm	16 mm	10 mm	Round Bore	8 mm	—	—	Black-Oxide 1045 Carbon Steel	Not Hardened	3598N276	00000	3598N277	00000
		—	1.5	13	45°	27.6 mm	30.58 mm	15 mm	23 mm	10 mm	Round Bore	10 mm	—	—	Black-Oxide 1045 Carbon Steel	Not Hardened	3598N278	00000	3598N279	00000
		—	1.5	26	45°	55.2 mm	58.15 mm	15 mm	40 mm	10 mm	Round Bore	12 mm	—	—	Black-Oxide 1045 Carbon Steel	Not Hardened	3598N285	00000	3598N286	00000


		14 1/2° Pressure Angle



				16	—	16	45°	1"	1.09"	1/2"	0.86"	0.5"	Keyed Bore with Set Screw	1/2"	0.125"	0.062"	1137 Carbon Steel	Hardened	2585N11	00000	2585N12	00000


				16	—	24	45°	1 1/2"	1.59"	1/2"	1.37"	0.5"	Keyed Bore with Set Screw	5/8"	0.187"	0.094"	1137 Carbon Steel	Hardened	2585N13	000000	2585N14	000000
				16	—	32	45°	2"	2.09"	1/2"	1.87"	0.5"	Keyed Bore with Set Screw	5/8"	0.187"	0.094"	1137 Carbon Steel	Hardened	2585N15	000000	2585N16	000000
				16	—	48	45°	3"	3.09"	1/2"	2.5"	0.5"	Keyed Bore with Set Screw	5/8"	0.187"	0.094"	1137 Carbon Steel	Hardened	2585N17	000000	2585N18	000000
				12	—	18	45°	1 1/2"	1.62"	3/4"	1.34"	0.5"	Keyed Bore with Set Screw	5/8"	0.187"	0.094"	1137 Carbon Steel	Hardened	2585N22	000000	2585N23	000000

Parallel Gears

Pair two parallel gears to transmit motion in a straight line or a gear with a rack to convert rotary motion to linear motion. Make sure mating components have different tooth directions.

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

							Hub, mm						Left-Hand Teeth		Right-Hand Teeth
	Gear Module	No. of Teeth	Helix Angle	Gear Pitch Dia., mm	OD, mm	Face Wd., mm	Dia.	Wd.	Bore Type	For Shaft Dia., mm	Material	Tooth Heat Treatment		Each		Each
20° Pressure Angle



		1	20	21 1/2°	20	22	8	17	10	Round Bore	6	4140 Alloy Steel	Hardened	3598N159	000000	3598N161	000000


		1	30	21 1/2°	30	32	8	25	10	Round Bore	10	4140 Alloy Steel	Hardened	3598N171	000000	3598N172	000000
		1	44	21 1/2°	44	46	8	30	10	Round Bore	10	4140 Alloy Steel	Hardened	3598N182	000000	3598N183	000000

Parallel Gear Racks


Parallel Gear on Gear Rack (Sold Separately)

Pair these racks with parallel helical gears that have an opposite tooth direction to convert rotary motion to linear motion.

									Left-Hand Teeth		Right-Hand Teeth
	Gear Module	Lg., mm	Helix Angle	Pitch Ht., mm	Ht., mm	Face Wd., mm	Material	Tooth Heat Treatment		Each		Each
20° Pressure Angle



		1	100	21 1/2°	14	15	8	4140 Alloy Steel	Not Hardened	3598N263	0000000	3598N264	0000000


		1	500	21 1/2°	14	15	8	4140 Alloy Steel	Not Hardened	3598N272	000000	3598N273	000000