18mm ID Sprockets | McMaster-Carr

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9 Products

Flat Sprockets

Save space and cut weight—these sprockets don’t have a raised hub so they’re best for tight spots and lightweight designs. Bolt or weld them to components and mounting surfaces, or add a custom hub. Although they are versatile, they’re harder to align than sprockets with hubs.

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

				06B	ISO	3/8"	60	187	Plain	18 mm to 172 mm	6836N139	000000


				08B	ISO	1/2"	39	122	Plain	18 mm to 144 mm	6836N179	00000

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

				18	22	6	2.8	8°	55	Set Screws	57095K424	000000




						Bushing Trade Number 1108

						18	22	6	2.8	8°	55	Set Screws	57095K436	00000




								Bushing Trade Number 1210

								18	25	6	2.8	8°	175	Set Screws	57095K449	00000




										Bushing Trade Number 1610

										18	25	6	2.8	8°	175	Set Screws	57095K492	00000

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

				18	1 1/4"	6	3	3°	95	9859T716	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



	18	32	29	2,000	2298K65	0000000

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



	18	32	24	990	42	Clamping Screws	1058K72	000000