Sprockets for 20mm Shaft Diameter

Sprocket teeth mesh with your roller chain to smoothly transmit power. These U.S.-made sprockets have machined teeth for a more precise fit than flame-cut or punched teeth, allowing them to glide in and out of the chain to reduce wear and extend chain life.

Steel—Steel is strong, but best for dry environments since moisture will cause it to rust.

Plain Bore—Plain bore sprockets give you options—machine a custom bore, weld, or press-fit them in place. They're sized to the minimum shaft diameter listed and are machinable up to the maximum.

	For Roller Chain
	Trade No.	Std.	Pitch	No. of Teeth	OD, mm	Bore Type	For Shaft Dia.		Each
For Single Strand







				Steel

				05B	ISO	8 mm	13	37	Plain	8 mm to 20 mm	2302K84	000000


				05B	ISO	8 mm	17	48	Plain	8 mm to 20 mm	2302K58	00000
				06B	ISO	3/8"	15	51	Plain	10 mm to 20 mm	2302K4	00000
				08B	ISO	1/2"	10	47	Plain	10 mm to 20 mm	2302K105	00000


				For Double Strand







								Steel

								06B-2	ISO	3/8"	15	51	Plain	10 mm to 20 mm	3571N104	00000


								06B-2	ISO	3/8"	16	54	Plain	12 mm to 20 mm	3571N105	00000
								08B-2	ISO	1/2"	26	113	Plain	20 mm to 56 mm	3571N15	000000
								08B-2	ISO	1/2"	30	129	Plain	20 mm to 64 mm	3571N154	000000
								08B-2	ISO	1/2"	36	153	Plain	20 mm to 73 mm	3571N157	000000
								08B-2	ISO	1/2"	38	161	Plain	20 mm to 73 mm	3571N158	000000
								08B-2	ISO	1/2"	42	177	Plain	20 mm to 73 mm	3571N16	000000
								12B-2	ISO	3/4"	17	115	Plain	20 mm to 54 mm	3571N211	000000
								12B-2	ISO	3/4"	19	127	Plain	20 mm to 62 mm	3571N213	000000

Idler Sprockets

Maintain constant tension on your roller chain to reduce wear and vibration. These sprockets press against the chain to take up slack and rotate freely on bearings to keep the chain moving smoothly. They’re often paired with roller chain tensioners.

For Single Strand

Ball Bearing

Ball Bearing—Smoother than smooth—the balls inside these bearings roll nearly friction-free to handle high speeds. All are sealed to keep lubricant in and dust out.

Steel—Steel is strong, but best for dry environments since moisture will cause it to rust.

	For Roller Chain
	Trade No.	Std.	Pitch	No. of Teeth	For Shaft Dia., mm	OD, mm	Bearing Material		Each
Ball Bearing







				Steel

				16B	ISO	1"	12	20	109	Steel	4182N2	000000

Taper-Lock Bushings

Mount these hubless bushings flush into your sprocket or pulley for a slim profile with no protruding screws. They are for use with taper-lock sprockets of the same bushing trade number. As you tighten the included set screws, the bushing grips the shaft and pulls it into your sprocket or pulley.

			Keyway, mm
	For Shaft Dia., mm	Overall Wd., mm	Wd.	Dp.	Taper	Fastener Tightening Torque, in·lbf	Includes		Each
Steel







				Bushing Trade Number 1008

				20	22	6	2.8	8°	55	Set Screws	57095K426	000000




						Bushing Trade Number 1108

						20	22	6	2.8	8°	55	Set Screws	57095K438	00000




								Bushing Trade Number 1210

								20	25	6	2.8	8°	175	Set Screws	57095K452	00000




										Bushing Trade Number 1610

										20	25	6	2.8	8°	175	Set Screws	57095K494	00000




												Bushing Trade Number 1615

												20	38	6	2.8	8°	175	Set Screws	57095K526	00000




														Bushing Trade Number 2012

														20	32	6	2.8	8°	280	Set Screws	57095K548	00000

Metal Miter Gears


Gears Sold Separately	Keyed Bore with Set Screw


For 90° Shaft Angle

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

For two gears to mesh correctly, they must have the same pressure angle, shaft angle, pitch/module, and number of teeth.

1045 Carbon Steel—Carbon steel gears have hard, strong, and wear-resistant teeth. They’re best for heavy duty and high-torque applications, such as lifting equipment. However, these gears will rust when exposed to moisture or corrosive chemicals. Some gears have hardened teeth for additional wear resistance; gears with teeth that are not hardened can be hardened to fit your application.

												Hub, mm		Keyway, mm
	Gear Module	No. of Teeth	For Shaft Angle	Pressure Angle	Gear Pitch Dia., mm	OD, mm	Face Wd., mm	Overall Wd., mm	For Shaft Dia., mm	Mounting Distance, mm	Tooth Heat Treatment	Dia.	Wd.	Wd.	Dp.	Set Screw Thread Size		Each
Keyed Bore with Set Screw







				1045 Carbon Steel

				2	30	90°	20°	60	62.8	12	29.4	20	50	Hardened	45	12.5	6	2.8	M6	2600N6	000000

Metal Ratchet Gears and Pawls

Gears and

Pawls (Sold

Separately)

Gears

Compared to nylon gears, these metal ratchet gears are better for high-load, high-speed, and heavy duty applications. Used to prevent unwanted motion in jacks, tie downs, clutches, and winches, ratchet gears have sloped teeth that allow motion in one direction and prevent it in the other.

Hardened—Gears with hardened teeth are more wear resistant than gears with teeth that are not hardened.

									Hub, mm
	Face Wd., mm	No. of Teeth	OD, mm	For Shaft Dia., mm	Mounting Distance, mm	Material	Tooth Heat Treatment	Overall Wd., mm	Dia.	Wd.		Each
Round Bore



		20	40	120	20	85.2	1045 Carbon Steel	Hardened	20	—	—	6283K85	0000000


		20	50	150	20	95.5	1045 Carbon Steel	Hardened	20	—	—	6283K86	000000
		25	30	120	20	95.7	1045 Carbon Steel	Hardened	25	—	—	6283K88	000000
		25	50	200	20	122.4	1045 Carbon Steel	Hardened	43	100	18	6283K121	000000

GT Timing Belt Idler Pulleys

Toothed

Get pitch-perfect compatibility with these free-spinning pulleys. They mesh with belts that have curved GT-profile teeth, reducing vibration and wear. As they rotate on their bearings, these pulleys press up against belts to reduce slack and keep the system moving smoothly. All are compatible with GatesPowerGrip GT, 2GT, GT2, GT3, and GT4 series. Idler pulleys are often used with belt tensioners.

Iron—Strong, but best for dry environments since moisture will cause them to rust.

						Toothed
	For Max. Belt Wd., mm	Pitch, mm	For Shaft Dia., mm	OD, mm	Bearing Type	No. of Teeth		Each
For 8MGT Trade Size







				Iron

				20	8	20	90	Roller	32	7769N21	0000000

Metal Bevel Gears

Gears Sold

Separately

Large Gears

Bevel gears provide right-angle speed reduction. They're a type of miter gear installed so that one gear is smaller than the other to achieve speed ratios ranging from 3:2 to 5:1. All are made of carbon steel for good strength.

A complete set consists of a large gear and a small gear, also known as a pinion (sold separately). For the gears to mesh correctly, they must have the same face width, pitch or module, and pressure angle.

Speed Ratio—The ratio by which shaft speed is reduced when transferring motion from the smaller to the larger gear. To increase shaft speed, transfer motion from the larger to the smaller gear. Changing shaft speed also changes torque: as speed decreases, torque increases. To achieve the speed ratio listed, match it across a set of compatible gears.

					Large Gears
Face Wd., mm	Gear Module	Pressure Angle	Speed Ratio	Material	For Shaft Dia., mm		Each
20	2.5	20°	5:1	1045 Carbon Steel	20	2515N355	0000000

Split-Tapered Bushings

Steel

The tapered barrel on these bushings is split on both sides, allowing them to contract more tightly around the shaft than quick-disconnect and taper-lock bushings. They're for use with split-tapered sprockets and pulleys of the same bushing trade number. As you tighten the included screws, the bushing grips the shaft and pulls it into the sprocket or pulley.

			Keyway, mm
	For Shaft Dia., mm	Overall Wd.	Wd.	Dp.	Taper	Fastener Tightening Torque, in·lbf		Each
Steel







				Bushing Trade Number H with Clamping Screws

				20	1 1/4"	6	3	3°	95	9859T718	000000

Flanged Screw-Clamp Bushings

A mounting flange prevents movement during tightening. These bushings are good for shock loads. When you tighten the included screws, the bushing's inner sleeve contracts onto the shaft and the outer sleeve expands to hold your sprocket, pulley, or gear. They can be mounted on shafts with or without keyways.

	OD, mm	Overall Wd., mm	Max. Torque, in·lbf	Fastener Tightening Torque, in·lbf	Includes		Each
Steel



	20	38	30	1,800	90	Clamping Screws	1058K74	000000

Corrosion-Resistant Flanged Screw-Clamp Bushings

Made from stainless steel or plated with nickel, these bushings resist corrosion. A mounting flange prevents movement during tightening. As screw-clamp bushings, they're good for shock loads. When you tighten the clamping screws, the bushing's inner sleeve tightens onto the shaft and the outer sleeve expands to hold your sprocket, pulley, or gear.

Nickel-Plated Steel—Nickel-plated steel bushings have good corrosion resistance in wet environments. However, the plating may begin to flake with long-term use.

Stainless Steel—Stainless steel bushings have excellent corrosion resistance and can withstand prolonged exposure to moisture.

	OD, mm	Overall Wd., mm	Max. Torque, in·lbf	Fastener Tightening Torque, in·lbf	Includes		Each
Nickel-Plated Steel



	20	44	34	1,150	70	Clamping Screws	5530N23	0000000


	Stainless Steel



			20	44	34	920	60	Clamping Screws	5530N108	000000

Quick-Grip Screw-Clamp Bushings

Also known as Trantorque bushings, these tighten with a twist of the collar nut—no screws needed. As you tighten the collar nut, the inner sleeve contracts onto the shaft and the outer sleeve expands to hold your sprocket, pulley, or gear.

	OD, mm	Overall Wd., mm	Max. Torque, in·lbf		Each
Steel



	20	35	32	2,750	2298K67	0000000


	Zinc-Plated Steel



			20	45	48	2,550	2298K57	000000

Quick-Grip Flanged Hydraulic Bushings

Tighten just one set screw to clamp these bushings evenly around your shaft. The screw forces hydraulic fluid in between the double-walled sleeve, expanding the two walls against the shaft and the hub of your sprocket, pulley, or gear for a tight hold. Since you don’t have to tighten multiple screw clamps individually, these bushings are quick to adjust and more likely to stay aligned on your shaft. They’re also good for shock loads. A mounting flange prevents movement during tightening. Use a hex key to tighten.

Note: To avoid deforming the sleeve walls, make sure to fully tighten the screw.

17-4 PH Stainless Steel—17-4 PH stainless steel bushings have excellent corrosion resistance in most environments.

				Set Screw
	For Shaft Dia., mm	OD, mm	Overall Wd., mm	Hole Dia.	Thread Size	Max. Torque, in·lbf	Fastener Tightening Torque, in·lbf		Each
Steel



		20	51	44	3/8"	M10	970	40	7636N18	0000000


		17-4 PH Stainless Steel



				20	51	44	3/8"	M10	970	40	7636N28	000000