Flat-Belt Sheaves | McMaster-Carr

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59 Products

Flat Belt Idler Pulleys

Nylon

Cast Iron

Steel

Image of Attribute. Front orientation. Contains Annotated.

These pulleys spin freely on built-in bearings to maintain tension for reduced wear and vibration. They’re often used with belt tensioners (sold separately).

Ball Bearing—Pulleys with ball bearings ensure proper positioning inside a tube or housing. They’re sealed to block out dust and contaminants better than pulleys with needle roller bearings.

Needle Roller Bearing—Pulleys with needle roller bearings minimize internal friction.

Nylon—Nylon pulleys are lightweight and corrosion resistant.

Cast Iron and Steel—Cast iron and steel pulleys are more durable than nylon pulleys.

	OD	For Shaft Dia.	Dia.	Wd.	Groove Dp.	Material		Each
Ball Bearing



	5/8"	3.5"	3/8"	3"	1 3/32"	0.25"	Nylon	0000000	000000


	5/8"	3.5"	1/2"	3"	1 3/32"	0.25"	Nylon	0000000	00000
	11/16"	2.5"	0.635"	2 1/4"	7/8"	0.125"	Cast Iron	0000000	00000
	13/16"	2.8"	3/8"	2 33/64"	1 7/32"	0.11"	Nylon	0000000	00000
	13/16"	2.8"	1/2"	2 33/64"	1 7/32"	0.11"	Nylon	0000000	00000
	13/16"	3.5"	3/8"	3"	1 7/32"	0.25"	Nylon	0000000	00000
	13/16"	3.5"	1/2"	3"	1 7/32"	0.25"	Nylon	0000000	00000
	7/8"	2.4"	3/8"	2"	1 5/32"	0.18"	Nylon	0000000	00000
	7/8"	2.4"	1/2"	2"	1 5/32"	0.18"	Nylon	0000000	00000
	7/8"	3"	3/8"	2 1/2"	1 5/16"	0.25"	Nylon	0000000	00000
	7/8"	3"	1/2"	2 1/2"	1 5/16"	0.25"	Nylon	0000000	00000


	7/8"	5.6"	3/8"	5 1/32"	1 19/64"	0.26"	Nylon	0000000	00000
	7/8"	5.6"	1/2"	5 1/32"	1 19/64"	0.26"	Nylon	0000000	00000
	29/32"	4.5"	3/8"	4"	1 25/64"	0.25"	Nylon	0000000	00000
	29/32"	4.5"	1/2"	4"	1 25/64"	0.25"	Nylon	0000000	00000
	1 1/16"	4.5"	0.635"	4"	1 7/16"	0.25"	Cast Iron	0000000	000000
	1 1/8"	2.1"	3/8"	1 7/8"	1 35/64"	0.09"	Nylon	0000000	00000
	1 1/8"	2.1"	1/2"	1 7/8"	1 35/64"	0.09"	Nylon	0000000	00000
	1 1/8"	3.4"	3/8"	2 31/32"	1 43/64"	0.2"	Nylon	0000000	00000
	1 1/8"	3.4"	1/2"	2 31/32"	1 43/64"	0.2"	Nylon	0000000	00000
	2 1/16"	4.5"	0.635"	4"	2 7/16"	0.25"	Cast Iron	0000000	000000


	3 1/16"	4.5"	0.635"	4"	3 7/16"	0.25"	Cast Iron	0000000	000000
	4 1/2"	7"	1"	6"	5"	0.5"	Cast Iron	0000000	000000
	6 1/4"	7"	1"	6"	6 3/4"	0.5"	Cast Iron	0000000	000000


	Needle Roller Bearing



			7/16"	1.4"	1/2"	1 1/8"	5/8"	0.125"	Steel	000000	00000


			9/16"	1.8"	1/2"	1 3/8"	13/16"	0.187"	Steel	000000	00000
			11/16"	2.5"	1"	2 1/4"	7/8"	0.125"	Steel	000000	00000
			1 1/16"	4.5"	1"	4"	1 7/16"	0.25"	Cast Iron	000000	000000
			2 1/16"	4.5"	1"	4"	2 7/16"	0.25"	Cast Iron	000000	000000
			3 1/16"	4.5"	1"	4"	3 7/16"	0.25"	Cast Iron	000000	000000
			4 1/2"	7"	1 1/2"	6"	5"	0.5"	Cast Iron	0000000	000000

Flat Belt Drive Pulleys

Also known as paper-plant pulleys, these are made of a composite that minimizes belt slippage and wear.

					Keyway
For Belt Wd.	OD	For Shaft Dia.	Dia.	Wd.	Wd.	Dp.	Material	Includes		Each
1"	2"	1/2"	2"	1 1/2"	1/8"	1/16"	Laminate	One Set Screw	00000000	000000
1"	2"	5/8"	2"	1 1/2"	3/16"	3/32"	Laminate	One Set Screw	00000000	00000
1"	2"	3/4"	2"	1 1/2"	3/16"	3/32"	Laminate	One Set Screw	00000000	00000
1 1/2"	2"	1/2"	2"	2"	1/8"	1/16"	Laminate	One Set Screw	00000000	00000
1 1/2"	2"	5/8"	2"	2"	3/16"	3/32"	Laminate	One Set Screw	00000000	00000
1 1/2"	2"	3/4"	2"	2"	3/16"	3/32"	Laminate	One Set Screw	00000000	00000
2 1/2"	2"	1/2"	2"	3"	1/8"	1/16"	Laminate	Two Set Screws	00000000	00000
2 1/2"	2"	5/8"	2"	3"	3/16"	3/32"	Laminate	Two Set Screws	00000000	00000
2 1/2"	2"	3/4"	2"	3"	3/16"	3/32"	Laminate	Two Set Screws	00000000	00000
3"	2.5"	3/4"	2.5"	3 1/2"	3/16"	3/32"	Laminate	Two Set Screws	00000000	000000
3"	2.5"	7/8"	2.5"	3 1/2"	3/16"	3/32"	Laminate	Two Set Screws	00000000	000000
3"	2.5"	1"	2.5"	3 1/2"	1/4"	1/8"	Laminate	Two Set Screws	00000000	000000
3"	3"	3/4"	3"	3 1/2"	3/16"	3/32"	Laminate	Two Set Screws	00000000	000000
3"	3"	7/8"	3"	3 1/2"	3/16"	3/32"	Laminate	Two Set Screws	00000000	000000
3"	3"	1"	3"	3 1/2"	1/4"	1/8"	Laminate	Two Set Screws	00000000	000000
3"	3.5"	3/4"	3.5"	3 1/2"	3/16"	3/32"	Laminate	Two Set Screws	00000000	000000
3"	3.5"	7/8"	3.5"	3 1/2"	3/16"	3/32"	Laminate	Two Set Screws	00000000	000000
3"	3.5"	1"	3.5"	3 1/2"	1/4"	1/8"	Laminate	Two Set Screws	00000000	000000
3"	3.5"	1 1/4"	3.5"	3 1/2"	1/4"	1/8"	Laminate	Two Set Screws	00000000	000000
3"	3.5"	1 1/2"	3.5"	3 1/2"	3/8"	3/16"	Laminate	Two Set Screws	00000000	000000
4"	4"	3/4"	4"	4 1/2"	3/16"	3/32"	Laminate	Two Set Screws	00000000	000000
4"	4"	7/8"	4"	4 1/2"	3/16"	3/32"	Laminate	Two Set Screws	00000000	000000
4"	4"	1"	4"	4 1/2"	1/4"	1/8"	Laminate	Two Set Screws	00000000	000000
4"	4"	1 1/4"	4"	4 1/2"	1/4"	1/8"	Laminate	Two Set Screws	00000000	000000
4"	4"	1 1/2"	4"	4 1/2"	3/8"	3/16"	Laminate	Two Set Screws	00000000	000000

GT Timing Belt Idler Pulleys

Without Teeth

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.

Corrosion-Resistant Aluminum—Lightweight and resist rust in wet environments. Although aluminum pulleys are one-third the weight of iron pulleys, they aren't as strong.

Without Teeth—These pulleys press against the smooth side of the belt instead of the toothed side to maintain tension.

						Without Teeth
	For Max. Belt Wd., mm	Pitch, mm	For Shaft Dia., mm	OD, mm	Bearing Type		Each
For 2MGT Trade Size







				Corrosion-Resistant Aluminum

				6	2	5	15	Ball	0000000	00000


				9	2	5	15	Ball	0000000	0000
				12	2	5	15	Ball	0000000	0000