Triple Pulleys | McMaster-Carr

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53 Products

Adjustable-Speed V-Belt Pulleys

3 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.

For technical drawings and 3-D models, click on a part number.

					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 3/4"), 3" (2 3/4"), 4" (3 3/4")	1/2"	1 7/8"	0.5"	__	__	Zinc	Solid	One Set Screw	0000000	000000
3	2" (1 3/4"), 3" (2 3/4"), 4" (3 3/4")	5/8"	1 7/8"	0.5"	3/16"	3/32"	Zinc	Solid	One Set Screw	0000000	00000
3	2" (1 3/4"), 3" (2 3/4"), 4" (3 3/4")	3/4"	1 7/8"	0.5"	3/16"	3/32"	Zinc	Solid	One Set Screw	0000000	00000
3	3" (2 3/4"), 3 1/2" (3 1/4"), 4" (3 3/4")	1/2"	1 3/4"	0.5"	__	__	Zinc	Solid	One Set Screw	0000000	00000

Quick-Disconnect (QD) Bushing-Bore V-Belt Pulleys

3 Grooves

The same pulley can be used with different shaft diameters; choose a compatible quick-disconnect bushing with the bore size you need.

For technical drawings and 3-D models, click on a part number.

For A, AX and B, BX Belts

No. of Grooves	OD	Pitch Dia. (For Belt Trade Size)	Wd.	Groove Dp.	For Bushing Style	Material	Body Type		Each
3	3.75"	3" (A, AX), 3.4" (B, BX)	2 1/2"	0.58"	SH	Steel	Solid	00000000	000000
3	3.95"	3.2" (A, AX), 3.6" (B, BX)	2 1/2"	0.58"	SH	Steel	Solid	00000000	00000
3	4.15"	3.4" (A, AX), 3.8" (B, BX)	2 1/2"	0.58"	SH	Steel	Solid	00000000	00000
3	4.35"	3.6" (A, AX), 4" (B, BX)	2 1/2"	0.58"	SH	Steel	Solid	00000000	00000
3	4.55"	3.8" (A, AX), 4.2" (B, BX)	2 1/2"	0.58"	SH	Steel	Solid	00000000	00000
3	4.75"	4" (A, AX), 4.4" (B, BX)	2 1/2"	0.58"	SH	Steel	Solid	00000000	000000
3	4.95"	4.2" (A, AX), 4.6" (B, BX)	2 1/2"	0.58"	SD	Steel	Solid	00000000	000000
3	5.15"	4.4" (A, AX), 4.8" (B, BX)	2 1/2"	0.58"	SD	Steel	Solid	00000000	000000
3	5.35"	4.6" (A, AX), 5" (B, BX)	2 1/2"	0.58"	SD	Steel	Solid	00000000	000000
3	5.55"	4.8" (A, AX), 5.2" (B, BX)	2 1/2"	0.58"	SD	Steel	Solid	00000000	000000
3	5.75"	5" (A, AX), 5.4" (B, BX)	2 1/2"	0.58"	SD	Steel	Solid	00000000	000000
3	5.95"	5.2" (A, AX), 5.6" (B, BX)	2 1/2"	0.58"	SD	Steel	Solid	00000000	000000
3	6.15"	5.4" (A, AX), 5.8" (B, BX)	2 1/2"	0.58"	SD	Steel	Solid	00000000	000000
3	6.35"	5.6" (A, AX), 6" (B, BX)	2 1/2"	0.58"	SD	Steel	Solid	00000000	000000
3	6.55"	5.8" (A, AX), 6.2" (B, BX)	2 1/2"	0.58"	SD	Steel	Solid	00000000	000000
3	6.75"	6" (A, AX), 6.4" (B, BX)	2 1/2"	0.58"	SD	Steel	Solid	00000000	000000
3	6.95"	6.2" (A, AX), 6.6" (B, BX)	2 1/2"	0.58"	SD	Steel	Solid	00000000	000000
3	7.15"	6.4" (A, AX), 6.8" (B, BX)	2 1/2"	0.58"	SD	Cast Iron	Solid	00000000	000000
3	7.35"	6.6" (A, AX), 7" (B, BX)	2 1/2"	0.58"	SK	Cast Iron	Solid	00000000	000000
3	7.75"	7" (A, AX), 7.4" (B, BX)	2 1/2"	0.58"	SK	Cast Iron	Solid	00000000	000000
3	8.35"	7.6" (A, AX), 8" (B, BX)	2 1/2"	0.58"	SK	Cast Iron	Solid	00000000	000000
3	8.95"	8.2" (A, AX), 8.6" (B, BX)	2 1/2"	0.58"	SK	Cast Iron	Solid	00000000	000000
3	9.75"	9" (A, AX), 9.4" (B, BX)	2 1/2"	0.58"	SK	Cast Iron	Solid	00000000	000000
3	11.35"	10.6" (A, AX), 11" (B, BX)	2 1/2"	0.58"	SK	Cast Iron	Spoked	00000000	000000
3	12.75"	12" (A, AX), 12.4" (B, BX)	2 1/2"	0.58"	SK	Cast Iron	Spoked	00000000	000000

For 3V and 3VX Belts

No. of Grooves	OD	Pitch Dia.	Wd.	Groove Dp.	For Bushing Style	Material	Body Type		Each
3	3.35"	3.3"	1 1/2"	0.34"	SH	Cast Iron	Solid	00000000	000000
3	3.65"	3.6"	1 1/2"	0.34"	SH	Cast Iron	Solid	00000000	00000
3	4.12"	4.07"	1 1/2"	0.34"	SH	Cast Iron	Solid	00000000	00000
3	5"	4.95"	1 1/2"	0.34"	SDS	Cast Iron	Solid	00000000	00000

Taper-Lock Bushing-Bore V-Belt Pulleys

3 Grooves

Mount these pulleys with a taper-lock bushing for a tight, wobble-free hold on your shaft. These pulleys transfer force from the shaft to a V-belt in a power transmission system, and also help with misalignment. Made of cast iron, these pulleys are durable and resist wear.

Depending on the taper-lock bushing you choose, the same pulley can be used with different shaft diameters.

For technical drawings and 3-D models, click on a part number.

For SPA and XPA Belts

No. of Grooves	OD, mm	Pitch Dia., mm	Wd., mm	Overall Wd., mm	Groove Dp., mm	For Bushing Style	Material	Body Type		Each
3	76.6	71	50	50	13.8	1108	Cast Iron	Solid	00000000	000000
3	90.6	85	50	50	13.8	1210	Cast Iron	Solid	00000000	00000
3	95.6	90	50	50	13.8	1610	Cast Iron	Solid	00000000	00000
3	111.6	106	50	50	13.8	1610	Cast Iron	Solid	00000000	00000
3	123.6	118	50	50	13.8	2012	Cast Iron	Solid	00000000	00000
3	130.6	125	50	50	13.8	2012	Cast Iron	Solid	00000000	00000
3	145.6	140	50	50	13.8	2517	Cast Iron	Solid	00000000	000000
3	155.6	150	50	50	13.8	2517	Cast Iron	Solid	00000000	000000
3	165.6	160	50	50	13.8	2517	Cast Iron	Solid	00000000	000000
3	205.6	200	50	50	13.8	2517	Cast Iron	Solid	0000000	000000

For SPB and XPB Belts

No. of Grooves	OD, mm	Pitch Dia., mm	Wd., mm	Overall Wd., mm	Groove Dp., mm	For Bushing Style	Material	Body Type		Each
3	167	160	63	63	17.5	2517	Cast Iron	Solid	00000000	0000000
3	187	180	63	63	17.5	2517	Cast Iron	Solid	0000000	000000
3	197	190	63	63	17.5	2517	Cast Iron	Solid	00000000	000000
3	231	224	63	63	17.5	2517	Cast Iron	Solid	00000000	000000
3	342	335	63	63	17.5	3020	Cast Iron	Solid	00000000	000000
3	457	450	63	89	17.5	3535	Cast Iron	Solid	00000000	000000

For SPZ and XPZ Belts

No. of Grooves	OD, mm	Pitch Dia., mm	Wd., mm	Overall Wd., mm	Groove Dp., mm	For Bushing Style	Material	Body Type		Each
3	89	85	40	40	11	1610	Cast Iron	Solid	00000000	000000
3	116	112	40	40	11	2012	Cast Iron	Solid	00000000	00000
3	136	132	40	40	11	2012	Cast Iron	Solid	00000000	00000

V-Belt Idler Pulleys

3 Grooves

These pulleys spin freely on built-in ball bearings to maintain tension for reduced wear and vibration. Commonly used with belt tensioners (sold separately), they are lightweight and corrosion and abrasion resistant. Bearings are double sealed to keep dirt out.

For technical drawings and 3-D models, click on a part number.

For 5L, B, BX Belts
No. of Grooves	OD	For Shaft Dia.	Pitch Dia.	Wd.	Groove Dp.	Material	Body Type		Each
3	6.3"	1/2"	5.18"	2 7/16"	0.55"	Nylon Plastic	Solid	00000000	0000000