Cast Iron Gears | McMaster-Carr

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About Gears

Worm and Gear Sold Separately

Worm gears use screw threads to make large reductions to shaft speed while transmitting motion at a right angle. They transmit motion from worm to gear and cannot be reversed. For gears and worms to mesh correctly, they must have the same pressure angle and pitch/module. These worms are compatible with plastic worm gears.

Speed ratio is the ratio by which output shaft speed is reduced. As speed decreases, torque increases.

Cast iron gears are strong and durable.

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

Inch Worm Gears

Gear

										Hub
Gear Pitch	Speed Ratio	Number of Teeth	Pressure Angle	Gear Pitch Dia.	For Number of Thread Starts	OD	Face Wd.	Overall Wd.	For Shaft Dia.	Dia.	Wd.	Material	For Thread Direction	Teeth Heat Treatment	Teeth Fabrication		Each
Round Bore—Cast Iron
12	18:1	18	14 1/2°	1 1/2"	1	1.69"	1/2"	1.125"	1/2"	1.25"	0.625"	Cast Iron	Right Hand	Not Hardened	Not Ground	000000000	000000
12	20:1	20	14 1/2°	1.67"	1	1.85"	1/2"	1.125"	1/2"	1.25"	0.625"	Cast Iron	Right Hand	Not Hardened	Not Ground	000000000	00000
12	30:1	30	14 1/2°	2 1/2"	1	2.69"	1/2"	1.125"	1/2"	1.25"	0.625"	Cast Iron	Right Hand	Not Hardened	Not Ground	000000000	000000
12	40:1	40	14 1/2°	3.33"	1	3.52"	1/2"	1.25"	5/8"	1.5"	0.75"	Cast Iron	Right Hand	Not Hardened	Not Ground	000000000	000000
12	60:1	60	14 1/2°	5"	1	5.19"	1/2"	1.25"	5/8"	1.75"	0.75"	Cast Iron	Right Hand	Not Hardened	Not Ground	000000000	000000
10	20:1	20	14 1/2°	2"	1	2.22"	5/8"	1.375"	1/2"	1.25"	0.75"	Cast Iron	Right Hand	Not Hardened	Not Ground	000000000	000000
10	30:1	30	14 1/2°	3"	1	3.22"	5/8"	1.375"	5/8"	1.75"	0.75"	Cast Iron	Right Hand	Not Hardened	Not Ground	000000000	000000
10	40:1	40	14 1/2°	4"	1	4.22"	5/8"	1.375"	5/8"	1.75"	0.75"	Cast Iron	Right Hand	Not Hardened	Not Ground	000000000	000000
10	50:1	50	14 1/2°	5"	1	5.22"	5/8"	1.375"	3/4"	2"	0.75"	Cast Iron	Right Hand	Not Hardened	Not Ground	000000000	000000
10	100:1	100	14 1/2°	10"	1	10.22"	5/8"	1.375"	3/4"	2.5"	0.75"	Cast Iron	Right Hand	Not Hardened	Not Ground	000000000	000000
8	20:1	20	14 1/2°	2 1/2"	1	2.78"	3/4"	1.5"	3/4"	1.75"	0.75"	Cast Iron	Right Hand	Not Hardened	Not Ground	000000000	000000
8	30:1	30	14 1/2°	3 3/4"	1	4.03"	3/4"	1.5"	3/4"	1.75"	0.75"	Cast Iron	Right Hand	Not Hardened	Not Ground	000000000	000000
8	40:1	40	14 1/2°	5"	1	5.28"	3/4"	1.625"	1"	2.375"	0.875"	Cast Iron	Right Hand	Not Hardened	Not Ground	000000000	000000
6	20:1	20	14 1/2°	3.33"	1	3.71"	1"	1.875"	3/4"	1.875"	0.875"	Cast Iron	Right Hand	Not Hardened	Not Ground	000000000	000000
6	24:1	24	14 1/2°	4"	1	4.37"	1"	1.875"	3/4"	1.875"	0.875"	Cast Iron	Right Hand	Not Hardened	Not Ground	000000000	000000
6	30:1	30	14 1/2°	5"	1	5.37"	1"	1.875"	7/8"	2.25"	0.875"	Cast Iron	Right Hand	Not Hardened	Not Ground	000000000	000000
6	40:1	40	14 1/2°	6.67"	1	7.04"	1"	1.875"	1"	2.5"	0.875"	Cast Iron	Right Hand	Not Hardened	Not Ground	000000000	000000
6	72:1	72	14 1/2°	12"	1	12.37"	1"	2.25"	1 1/4"	3"	1.25"	Cast Iron	Right Hand	Not Hardened	Not Ground	000000000	000000

Metric Worm Gears

Gear

										Hub
Module	Speed Ratio	Number of Teeth	Pressure Angle	Gear Pitch Dia., mm	For Number of Thread Starts	OD, mm	Face Wd., mm	Overall Wd., mm	For Shaft Dia., mm	Dia., mm	Wd., mm	Material	For Thread Direction	Teeth Heat Treatment	Teeth Fabrication		Each
Round Bore—Cast Iron
1	120:1	120	20°	120	1	123	10	20	10	40	10	Cast Iron	Right Hand	Not Hardened	Not Ground	000000000	000000
1	60:1	60	20°	60	1	63	10	20	10	30	10	Cast Iron	Right Hand	Not Hardened	Not Ground	000000000	00000
1	100:1	100	20°	100	1	103	10	20	10	40	10	Cast Iron	Right Hand	Not Hardened	Not Ground	000000000	00000
1	80:1	80	20°	80	1	83	10	20	10	35	10	Cast Iron	Right Hand	Not Hardened	Not Ground	000000000	00000
1.5	30:1	30	20°	45	1	49.5	12	22	10	30	10	Cast Iron	Right Hand	Not Hardened	Not Ground	000000000	00000
1.5	40:1	40	20°	60	1	64.5	12	22	12	30	10	Cast Iron	Right Hand	Not Hardened	Not Ground	000000000	00000
2	20:1	20	14 1/2°	40	1	46	22	35	12	33	13	Cast Iron	Right Hand	Not Hardened	Not Ground	000000000	00000
2	10:1	20	14 1/2°	40	2	46	22	35	12	33	13	Cast Iron	Right Hand	Not Hardened	Not Ground	000000000	00000
2.5	10:1	20	20°	50	2	57.5	22	36	12	35	14	Cast Iron	Right Hand	Not Hardened	Not Ground	000000000	00000

Taper-Lock Bushing-Bore V-Belt Pulleys

1 Groove

2 Grooves

3 Grooves

4 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
1	76.6	71	20	22	13.8	1108	Cast Iron	Solid	00000000	000000
1	90.6	85	20	25	13.8	1210	Cast Iron	Solid	00000000	00000
1	95.6	90	20	25	13.8	1210	Cast Iron	Solid	00000000	00000
1	100.6	95	20	25	13.8	1210	Cast Iron	Solid	00000000	00000
1	105.6	100	20	25	13.8	1610	Cast Iron	Solid	00000000	00000
1	123.6	118	20	25	13.8	1610	Cast Iron	Solid	00000000	00000
1	137.6	132	20	26.5	13.8	1610	Cast Iron	Solid	00000000	00000
1	155.6	150	20	25	13.8	1610	Cast Iron	Solid	00000000	00000
1	205.6	200	20	32	13.8	2012	Cast Iron	Solid	00000000	00000
2	72.6	67	35	35	13.8	1108	Cast Iron	Solid	00000000	00000
2	76.6	71	35	35	13.8	1108	Cast Iron	Solid	00000000	00000
2	85.6	80	35	35	13.8	1210	Cast Iron	Solid	00000000	00000
2	90.6	85	35	35	13.8	1210	Cast Iron	Solid	0000000	00000
2	95.6	90	35	35	13.8	1610	Cast Iron	Solid	00000000	00000
2	100.6	95	35	35	13.8	1610	Cast Iron	Solid	0000000	00000
2	105.6	100	35	35	13.8	1610	Cast Iron	Solid	00000000	00000
2	111.6	106	35	35	13.8	1610	Cast Iron	Solid	00000000	00000
2	130.6	125	35	35	13.8	1610	Cast Iron	Solid	00000000	00000
2	137.6	132	35	35	13.8	2012	Cast Iron	Solid	0000000	00000
2	145.6	140	35	35	13.8	2012	Cast Iron	Solid	00000000	00000
2	155.6	150	35	35	13.8	2012	Cast Iron	Solid	00000000	00000
2	165.6	160	35	35	13.8	2012	Cast Iron	Solid	00000000	00000
2	195.6	190	35	35	13.8	2012	Cast Iron	Solid	00000000	000000
3	76.6	71	50	50	13.8	1108	Cast Iron	Solid	00000000	00000
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
4	95.6	90	65	65	13.8	1610	Cast Iron	Solid	00000000	00000
4	145.6	140	65	65	13.8	2517	Cast Iron	Solid	00000000	000000
4	155.6	150	65	65	13.8	2517	Cast Iron	Solid	00000000	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
2	177	171	44	44	17.5	2012	Cast Iron	Solid	00000000	0000000
2	187	180	44	45	17.5	2517	Cast Iron	Solid	00000000	000000
2	207	200	44	45	17.5	2517	Cast Iron	Solid	00000000	000000
2	287	280	44	45	17.5	2517	Cast Iron	Solid	00000000	000000
3	167	160	63	63	17.5	2517	Cast Iron	Solid	00000000	000000
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
4	167	160	82	82	17.5	2517	Cast Iron	Solid	00000000	000000
4	197	190	82	82	17.5	2517	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
1	67	63	16	22	11	1108	Cast Iron	Solid	00000000	000000
1	89	85	16	25	11	1210	Cast Iron	Solid	00000000	00000
1	104	100	16	25	11	1210	Cast Iron	Solid	00000000	00000
1	194	190	16	25	11	1610	Cast Iron	Solid	00000000	00000
2	67	63	28	28	11	1108	Cast Iron	Solid	00000000	00000
2	89	85	28	28	11	1610	Cast Iron	Solid	00000000	00000
2	104	100	28	28	11	1610	Cast Iron	Solid	00000000	00000
2	129	125	28	28	11	1610	Cast Iron	Solid	00000000	00000
2	136	132	28	28	11	1610	Cast Iron	Solid	00000000	00000
2	174	170	28	32	11	2012	Cast Iron	Solid	00000000	00000
2	228	224	28	32	11	2012	Cast Iron	Solid	00000000	000000
2	284	280	28	32	11	2012	Cast Iron	Solid	0000000	000000
3	89	85	40	40	11	1610	Cast Iron	Solid	00000000	00000
3	116	112	40	40	11	2012	Cast Iron	Solid	00000000	00000
3	136	132	40	40	11	2012	Cast Iron	Solid	00000000	00000

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About Gears

Metal Worms and Worm Gears

Taper-Lock Bushing-Bore V-Belt Pulleys