Adjustable Pulleys | McMaster-Carr

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55 Products

Adjustable-Pitch V-Belt Drive Pulleys


1 Groove	2 Grooves	1 Groove	2 Grooves

Increase efficiency, vary speed, and extend the life of your drive by changing the pitch on these drive pulleys. Turn the sides of the pulley on the threaded hub to increase or decrease the pitch.

						Keyway
	No. of Grooves	For Shaft Dia.	Pitch Dia. (For Belt Trade Size)	Wd.	Overall Wd.	Wd.	Dp.	Material	Body Type	Includes		Each
3.15" OD



		1	1/2"	1.7" to 2.5" (3L), 1.9" to 2.9" (4L, A, AX), 2.4" to 3.2" (5L, B, BX)	21/32" to 31/32"	1 7/8"	—	—	Cast Iron	Solid	One Set Screw	00000000	000000


		1	5/8"	1.7" to 2.5" (3L), 1.9" to 2.9" (4L, A, AX), 2.4" to 3.2" (5L, B, BX)	21/32" to 31/32"	1 7/8"	3/16"	3/32"	Cast Iron	Solid	One Set Screw	00000000	00000
		1	3/4"	1.7" to 2.5" (3L), 1.9" to 2.9" (4L, A, AX), 2.4" to 3.2" (5L, B, BX)	21/32" to 31/32"	1 7/8"	3/16"	3/32"	Cast Iron	Solid	One Set Screw	00000000	00000
		1	7/8"	1.7" to 2.5" (3L), 1.9" to 2.9" (4L, A, AX), 2.4" to 3.2" (5L, B, BX)	21/32" to 31/32"	1 7/8"	3/16"	3/32"	Cast Iron	Solid	One Set Screw	00000000	00000


		3.35" OD



				2	1/2"	1.9" to 2.7" (3L), 2" to 3" (4L, A, AX), 2.5" to 3.3" (5L, B, BX)	1 3/8" to 2"	3"	—	—	Cast Iron	Solid	One Set Screw	0000000	000000


				2	5/8"	1.9" to 2.7" (3L), 2" to 3" (4L, A, AX), 2.5" to 3.3" (5L, B, BX)	1 3/8" to 2"	3"	3/16"	3/32"	Cast Iron	Solid	One Set Screw	0000000	000000
				2	3/4"	1.9" to 2.7" (3L), 2" to 3" (4L, A, AX), 2.5" to 3.3" (5L, B, BX)	1 3/8" to 2"	3"	3/16"	3/32"	Cast Iron	Solid	One Set Screw	0000000	000000
				2	7/8"	1.9" to 2.7" (3L), 2" to 3" (4L, A, AX), 2.5" to 3.3" (5L, B, BX)	1 3/8" to 2"	3"	3/16"	3/32"	Cast Iron	Solid	One Set Screw	0000000	000000


				3.75" OD



						1	1/2"	2.3" to 3.1" (3L), 2.4" to 3.4" (4L, A, AX), 2.7" to 3.7" (5L, B, BX)	21/32" to 1 1/32"	1 7/8"	—	—	Cast Iron	Solid	One Set Screw	00000000	00000


						1	5/8"	2.3" to 3.1" (3L), 2.4" to 3.4" (4L, A, AX), 2.7" to 3.7" (5L, B, BX)	21/32" to 1 1/32"	1 7/8"	3/16"	3/32"	Cast Iron	Solid	One Set Screw	00000000	00000
						1	3/4"	2.3" to 3.1" (3L), 2.4" to 3.4" (4L, A, AX), 2.7" to 3.7" (5L, B, BX)	21/32" to 1 1/32"	1 7/8"	3/16"	3/32"	Cast Iron	Solid	One Set Screw	00000000	00000
						1	7/8"	2.3" to 3.1" (3L), 2.4" to 3.4" (4L, A, AX), 2.7" to 3.7" (5L, B, BX)	21/32" to 1 1/32"	1 7/8"	3/16"	3/32"	Cast Iron	Solid	One Set Screw	00000000	00000
						1	1"	2.7" to 3.5" (3L), 2.9" to 3.9" (4L, A, AX), 3" to 4" (5L, B, BX)	9/16" to 1"	1 3/4"	1/4"	1/8"	Cast Iron	Solid	Two Set Screws	00000000	00000


						3.95" OD



								2	1/2"	2.5" to 3.3" (3L), 2.6" to 3.6" (4L, A, AX), 2.9" to 3.9" (5L, B, BX)	1 3/8" to 2 1/8"	3"	—	—	Cast Iron	Solid	One Set Screw	0000000	000000


								2	5/8"	2.5" to 3.3" (3L), 2.6" to 3.6" (4L, A, AX), 2.9" to 3.9" (5L, B, BX)	1 3/8" to 2 1/8"	3"	3/16"	3/32"	Cast Iron	Solid	One Set Screw	0000000	000000
								2	3/4"	2.5" to 3.3" (3L), 2.6" to 3.6" (4L, A, AX), 2.9" to 3.9" (5L, B, BX)	1 3/8" to 2 1/8"	3"	3/16"	3/32"	Cast Iron	Solid	One Set Screw	0000000	000000
								2	7/8"	2.5" to 3.3" (3L), 2.6" to 3.6" (4L, A, AX), 2.9" to 3.9" (5L, B, BX)	1 3/8" to 2 1/8"	3"	3/16"	3/32"	Cast Iron	Solid	One Set Screw	0000000	000000
								2	1 1/8"	2.5" to 3.3" (3L), 2.6" to 3.6" (4L, A, AX), 2.9" to 3.9" (5L, B, BX)	1 3/8" to 2 1/8"	3"	1/4"	1/8"	Cast Iron	Solid	One Set Screw	0000000	000000


								4.15" OD



										1	1/2"	2.7" to 3.5" (3L), 2.8" to 3.8" (4L, A, AX), 3.1" to 4.1" (5L, B, BX)	21/32" to 1 1/32"	1 7/8"	—	—	Cast Iron	Solid	One Set Screw	00000000	00000


										1	5/8"	2.7" to 3.5" (3L), 2.8" to 3.8" (4L, A, AX), 3.1" to 4.1" (5L, B, BX)	21/32" to 1 1/32"	1 7/8"	3/16"	3/32"	Cast Iron	Solid	One Set Screw	00000000	00000
										1	3/4"	2.7" to 3.5" (3L), 2.8" to 3.8" (4L, A, AX), 3.1" to 4.1" (5L, B, BX)	21/32" to 1 1/32"	1 7/8"	3/16"	3/32"	Cast Iron	Solid	One Set Screw	00000000	00000
										1	7/8"	2.7" to 3.5" (3L), 2.8" to 3.8" (4L, A, AX), 3.1" to 4.1" (5L, B, BX)	3/4" to 1 1/8"	2 5/32"	3/16"	3/32"	Cast Iron	Solid	One Set Screw	00000000	00000
										1	1"	2.7" to 3.5" (3L), 2.8" to 3.8" (4L, A, AX), 3.1" to 4.1" (5L, B, BX)	3/4" to 1 1/8"	2 5/32"	1/4"	1/8"	Cast Iron	Solid	One Set Screw	00000000	00000
										1	1 1/8"	2.7" to 3.5" (3L), 2.8" to 3.8" (4L, A, AX), 3.1" to 4.1" (5L, B, BX)	3/4" to 1 1/8"	2 5/32"	1/4"	1/8"	Cast Iron	Solid	One Set Screw	00000000	00000


										4.75" OD



										1	1/2"	3.3" to 4.1" (3L), 3.4" to 4.4" (4L, A, AX), 3.7" to 4.7" (5L, B, BX)	11/16" to 1 1/16"	1 15/16"	—	—	Cast Iron	Solid	One Set Screw	00000000	00000


										1	5/8"	3.3" to 4.1" (3L), 3.4" to 4.4" (4L, A, AX), 3.7" to 4.7" (5L, B, BX)	11/16" to 1 1/16"	1 15/16"	3/16"	3/32"	Cast Iron	Solid	One Set Screw	00000000	00000
										1	3/4"	3.3" to 4.1" (3L), 3.4" to 4.4" (4L, A, AX), 3.7" to 4.7" (5L, B, BX)	11/16" to 1 1/16"	1 15/16"	3/16"	3/32"	Cast Iron	Solid	One Set Screw	00000000	00000
										1	7/8"	3.3" to 4.1" (3L), 3.4" to 4.4" (4L, A, AX), 3.7" to 4.7" (5L, B, BX)	3/4" to 1 1/8"	2 5/32"	3/16"	3/32"	Cast Iron	Solid	One Set Screw	00000000	000000
										1	1"	3.3" to 4.1" (3L), 3.4" to 4.4" (4L, A, AX), 3.7" to 4.7" (5L, B, BX)	3/4" to 1 1/8"	2 5/32"	1/4"	1/8"	Cast Iron	Solid	One Set Screw	00000000	000000
										1	1 1/8"	3.3" to 4.1" (3L), 3.4" to 4.4" (4L, A, AX), 3.7" to 4.7" (5L, B, BX)	3/4" to 1 1/8"	2 5/32"	1/4"	1/8"	Cast Iron	Solid	One Set Screw	00000000	000000
										2	1/2"	3.3" to 4.1" (3L), 3.4" to 4.4" (4L, A, AX), 3.7" to 4.7" (5L, B, BX)	1 3/8" to 2 1/8"	3"	—	—	Cast Iron	Solid	One Set Screw	0000000	000000
		2								5/8"	3.3" to 4.1" (3L), 3.4" to 4.4" (4L, A, AX), 3.7" to 4.7" (5L, B, BX)	1 3/8" to 2 1/8"	3"	3/16"	3/32"	Cast Iron	Solid	One Set Screw	0000000	000000
		2	3/4"							3.3" to 4.1" (3L), 3.4" to 4.4" (4L, A, AX), 3.7" to 4.7" (5L, B, BX)	1 3/8" to 2 1/8"	3"	3/16"	3/32"	Cast Iron	Solid	One Set Screw	0000000	000000
		2	7/8"							3.3" to 4.1" (3L), 3.4" to 4.4" (4L, A, AX), 3.7" to 4.7" (5L, B, BX)	1 3/8" to 2 1/8"	3"	3/16"	3/32"	Cast Iron	Solid	One Set Screw	0000000	000000
		2	1"							3.3" to 4.1" (3L), 3.4" to 4.4" (4L, A, AX), 3.7" to 4.7" (5L, B, BX)	1 3/8" to 2 1/8"	3"	—	—	Cast Iron	Solid	One Set Screw	0000000	000000


		2	1 1/8"							3.3" to 4.1" (3L), 3.4" to 4.4" (4L, A, AX), 3.7" to 4.7" (5L, B, BX)	1 3/8" to 2 1/8"	3"	1/4"	1/8"	Cast Iron	Solid	One Set Screw	0000000	000000


		5.35" OD



				1						7/8"	3.9" to 4.7" (3L), 4" to 5" (4L, A, AX), 4.3" to 5.3" (5L, B, BX)	3/4" to 1 1/8"	2 5/32"	3/16"	3/32"	Cast Iron	Solid	One Set Screw	00000000	000000


				1	1"					3.9" to 4.7" (3L), 4" to 5" (4L, A, AX), 4.3" to 5.3" (5L, B, BX)	3/4" to 1 1/8"	2 5/32"	1/4"	1/8"	Cast Iron	Solid	One Set Screw	00000000	000000
				1	1 1/8"					3.9" to 4.7" (3L), 4" to 5" (4L, A, AX), 4.3" to 5.3" (5L, B, BX)	3/4" to 1 1/8"	2 5/32"	1/4"	1/8"	Cast Iron	Solid	One Set Screw	00000000	000000
				2	7/8"					3.9" to 4.7" (3L), 4" to 5" (4L, A, AX), 4.3" to 5.3" (5L, B, BX)	1 3/8" to 2 1/8"	3"	3/16"	3/32"	Cast Iron	Solid	One Set Screw	0000000	000000
				2	1 1/8"					3.9" to 4.7" (3L), 4" to 5" (4L, A, AX), 4.3" to 5.3" (5L, B, BX)	1 3/8" to 2 1/8"	3"	1/4"	1/8"	Cast Iron	Solid	One Set Screw	0000000	000000


				5.95" OD



										2	3/4"	, 4.2" to 5.2" (4L, A, AX), 4.5" to 5.5" (5L, B, BX)	1 5/8" to 2 3/8"	3 1/4"	3/16"	3/32"	Cast Iron	Solid	One Set Screw	0000000	000000


						2	1"			, 4.2" to 5.2" (4L, A, AX), 4.5" to 5.5" (5L, B, BX)	1 5/8" to 2 3/8"	3 1/4"	1/4"	1/8"	Cast Iron	Solid	One Set Screw	0000000	000000
						2	1 1/8"			, 4.2" to 5.2" (4L, A, AX), 4.5" to 5.5" (5L, B, BX)	1 5/8" to 2 3/8"	3 1/4"	1/4"	1/8"	Cast Iron	Solid	One Set Screw	0000000	000000
						2	1 3/8"			, 4.2" to 5.2" (4L, A, AX), 4.5" to 5.5" (5L, B, BX)	1 5/8" to 2 3/8"	3 1/4"	5/16"	5/32"	Cast Iron	Solid	One Set Screw	0000000	000000


						6.5" OD



										1	3/4"	, 4.7" to 5.7" (4L, A, AX), 4.8" to 6" (5L, B, BX)	7/8" to 1 1/4"	2 7/32"	3/16"	3/32"	Cast Iron	Solid	Two Set Screws	00000000	000000


								1		7/8"	, 4.7" to 5.7" (4L, A, AX), 4.8" to 6" (5L, B, BX)	7/8" to 1 1/4"	2 7/32"	3/16"	3/32"	Cast Iron	Solid	Two Set Screws	00000000	000000
								1	1 1/8"	, 4.7" to 5.7" (4L, A, AX), 4.8" to 6" (5L, B, BX)	7/8" to 1 1/4"	2 7/32"	1/4"	1/8"	Cast Iron	Solid	Two Set Screws	00000000	000000

Adjustable-Speed V-Belt Drive Pulleys


3 Grooves	4 Grooves

Also known as step-cone pulleys, these have multiple groove sizes so you can quickly change rotation speed by moving your belt to a different groove. Use with fractional-horsepower motors for drives with frequent speed changes.

						Keyway
	No. of Grooves	OD (Pitch Dia.)	For Shaft Dia.	Wd.	Groove Dp.	Wd.	Dp.	Material	Body Type	Includes		Each
For 4L, A Belts



		3	2" (1.75"), 3" (2.75"), 4" (3.75")	1/2"	1 7/8"	0.5"	—	—	Zinc	Solid	One Set Screw	0000000	000000


		3	2" (1.75"), 3" (2.75"), 4" (3.75")	5/8"	1 7/8"	0.5"	3/16"	3/32"	Zinc	Solid	One Set Screw	0000000	00000
		3	2" (1.75"), 3" (2.75"), 4" (3.75")	3/4"	1 7/8"	0.5"	3/16"	3/32"	Zinc	Solid	One Set Screw	0000000	00000
		3	3" (2.75"), 3.5" (3.25"), 4" (3.75")	1/2"	1 3/4"	0.5"	—	—	Zinc	Solid	One Set Screw	0000000	00000
		4	2" (1.75"), 2.5" (2.25"), 3.5" (3.25"), 4" (3.75")	1/2"	2 1/2"	0.5"	—	—	Zinc	Solid	One Set Screw	0000000	00000
		4	2" (1.75"), 2.5" (2.25"), 3.5" (3.25"), 4" (3.75")	5/8"	2 1/2"	0.5"	3/16"	3/32"	Zinc	Solid	One Set Screw	0000000	00000
		4	2" (1.75"), 2.5" (2.25"), 3.5" (3.25"), 4" (3.75")	3/4"	2 1/2"	0.5"	3/16"	3/32"	Zinc	Solid	One Set Screw	0000000	00000