Variable Pulleys | McMaster-Carr

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53 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	6205K111	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	6205K112	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	6205K113	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	6205K114	00000


		3.35" OD



				2	1/2"	2" to 2.8" (3L), 2.1" to 3.1" (4L, A), 2.4" to 3.2" (5L, B)	1 5/16" to 2"	3"	—	—	Cast Iron	Solid	One Set Screw	6205K771	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	6205K12	000000
				2	3/4"	2" to 2.8" (3L), 2.1" to 3.1" (4L, A), 2.4" to 3.2" (5L, B)	1 5/16" to 2"	3"	3/16"	3/32"	Cast Iron	Solid	One Set Screw	6205K772	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	6205K14	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	6205K121	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	6205K122	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	6205K123	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	6205K124	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	6205K125	00000


						3.95" OD



								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	6205K16	000000


								2	3/4"	2.6" to 3.4" (3L), 2.7" to 3.7" (4L, A), 2.8" to 3.8" (5L, B)	1 3/8" to 2 1/8"	3"	3/16"	3/32"	Cast Iron	Solid	One Set Screw	6205K17	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	6205K18	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	6205K19	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	6205K131	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	6205K132	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	6205K133	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	6205K134	000000
										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	6205K135	000000
										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	6205K136	000000


										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	6205K141	000000


	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	6205K142	000000
	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	6205K143	000000
	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	6205K144	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	6205K145	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	6205K146	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	6205K22	000000
	2										3/4"	3.4" to 4.2" (3L), 3.5" to 4.5" (4L, A), 3.6" to 4.6" (5L, B)	1 3/8" to 2"	3"	3/16"	3/32"	Cast Iron	Solid	One Set Screw	6205K774	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	6205K24	000000
	2	1"	3.4" to 4.2" (3L), 3.5" to 4.5" (4L, A), 3.6" to 4.6" (5L, B)								1 3/8" to 2"	3"	1/4"	1/8"	Cast Iron	Solid	One Set Screw	6205K775	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	6205K26	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	6205K152	000000


			1								1"	4" to 4.8" (3L), 4.1" to 5.1" (4L, A), 4.2" to 5.2" (5L, B)	3/4" to 1 1/8"	2 5/32"	1/4"	1/8"	Cast Iron	Solid	One Set Screw	6205K773	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	6205K154	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	6205K27	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	6205K29	000000


			5.95" OD



					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	6205K33	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	6205K35	000000


					6" OD



							2				3/4"	4.2" to 5.2" (4L, A), 4.4" to 5.6" (5L, B)	1 5/8" to 2 3/8"	3 1/4"	3/16"	3/32"	Cast Iron	Solid	One Set Screw	6205K776	000000


							2				1"	4.2" to 5.2" (4L, A), 4.4" to 5.6" (5L, B)	1 5/8" to 2 3/8"	3 1/4"	1/4"	1/8"	Cast Iron	Solid	One Set Screw	6205K777	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	6205K161	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	6205K162	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	6205K164	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 Alloy	Solid	One Set Screw	6213K47	000000


		3	2" (1.75"), 3" (2.75"), 4" (3.75")	5/8"	1 7/8"	0.5"	3/16"	3/32"	Zinc Alloy	Solid	One Set Screw	6213K48	00000
		3	2" (1.75"), 3" (2.75"), 4" (3.75")	3/4"	1 7/8"	0.5"	3/16"	3/32"	Zinc Alloy	Solid	One Set Screw	6213K49	00000
		3	3" (2.75"), 3.5" (3.25"), 4" (3.75")	1/2"	1 3/4"	0.5"	—	—	Zinc Alloy	Solid	One Set Screw	6213K54	00000
		4	2" (1.75"), 2.5" (2.25"), 3.5" (3.25"), 4" (3.75")	1/2"	2 1/2"	0.5"	—	—	Zinc Alloy	Solid	One Set Screw	6213K57	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 Alloy	Solid	One Set Screw	6213K58	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 Alloy	Solid	One Set Screw	6213K59	00000