AT5 Pulleys | McMaster-Carr

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68 Products

About Sizing Belts

AT Series Timing Belt Pulleys

Made of aluminum, these pulleys have good corrosion resistance. The teeth match up with the grooves along the inside diameter of a timing belt in order to move components forward or backward. Select a pulley with a maximum belt width that’s the same or larger than your timing belt width. Choose pulleys that have a diameter to match your shaft. Pulleys without a shaft diameter have a pilot bore, so you can customize them to your needs.

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

Press-Fit Mount

With Two Flanges

Without Flanges

With Two Flanges

Without Flanges

For 10 mm Max. Belt Wd.
OD, mm	Number of Teeth	Pitch, mm	For Shaft Dia., mm	Bore Type	Inside Wd., mm	Outside Wd., mm	Overall Wd., mm	Pitch Dia., mm	Number of Flanges	Fabrication	Material	Hub Dia., mm		Each
23	12	5	__	Plain	10	15	21	19.25	2	Machined	Aluminum	11	0000000	000000
28	15	5	__	Plain	10	15	21	24.05	2	Machined	Aluminum	16	0000000	00000
36	20	5	__	Plain	10	15	21	32	2	Machined	Aluminum	23	0000000	00000
38	22	5	__	Plain	10	15	21	35.25	2	Machined	Aluminum	24	0000000	00000
42	24	5	__	Plain	10	15	21	38.4	2	Machined	Aluminum	26	0000000	00000
48	27	5	__	Plain	10	15	21	43.2	2	Machined	Aluminum	30	0000000	00000
51	30	5	8	Plain	10	15	21	47.95	2	Machined	Aluminum	34	0000000	00000
70	42	5	8	Plain	10	15	21	67	2	Machined	Aluminum	40	0000000	00000
94.25	60	5	8	Plain	__	15	21	95.65	__	Machined	Aluminum	65	0000000	00000
For 16 mm Max. Belt Wd.
23	12	5	__	Plain	16	21	27	19.25	2	Machined	Aluminum	11	0000000	00000
32	18	5	__	Plain	16	21	27	28.8	2	Machined	Aluminum	20	0000000	00000
36	20	5	__	Plain	16	21	27	32	2	Machined	Aluminum	23	0000000	00000
38	22	5	__	Plain	16	21	27	35.25	2	Machined	Aluminum	24	0000000	00000
42	24	5	__	Plain	16	21	27	38.4	2	Machined	Aluminum	26	0000000	00000
44	25	5	__	Plain	16	21	27	40	2	Machined	Aluminum	26	0000000	00000
44	26	5	__	Plain	16	21	27	41.6	2	Machined	Aluminum	26	0000000	00000
48	27	5	8	Plain	16	21	27	43.2	2	Machined	Aluminum	30	0000000	00000
48	28	5	8	Plain	16	21	27	44.75	2	Machined	Aluminum	32	0000000	00000
51	30	5	8	Plain	16	21	27	47.95	2	Machined	Aluminum	34	0000000	00000
54	32	5	8	Plain	16	21	27	51.1	2	Machined	Aluminum	38	0000000	00000
64	36	5	8	Plain	16	21	27	57.45	2	Machined	Aluminum	38	0000000	00000
66	40	5	8	Plain	16	21	27	63.85	2	Machined	Aluminum	40	0000000	00000
68.8	44	5	8	Plain	__	21	27	70.2	__	Machined	Aluminum	45	0000000	00000
70	42	5	8	Plain	16	21	27	67	2	Machined	Aluminum	40	0000000	00000
94.25	60	5	8	Plain	__	21	27	95.65	__	Machined	Aluminum	65	0000000	000000
For 25 mm Max. Belt Wd.
32	16	5	__	Plain	25	30	36	25.6	2	Machined	Aluminum	18	0000000	00000
36	20	5	__	Plain	25	30	36	32	2	Machined	Aluminum	23	0000000	00000
38	22	5	__	Plain	25	30	36	35.25	2	Machined	Aluminum	24	0000000	00000
42	24	5	__	Plain	25	30	36	38.4	2	Machined	Aluminum	26	0000000	00000
44	25	5	__	Plain	25	30	36	40	2	Machined	Aluminum	26	0000000	00000
44	26	5	__	Plain	25	30	36	41.6	2	Machined	Aluminum	26	0000000	00000
48	27	5	8	Plain	25	30	36	43.2	2	Machined	Aluminum	30	0000000	00000
51	30	5	8	Plain	25	30	36	47.95	2	Machined	Aluminum	34	0000000	00000
54	32	5	8	Plain	25	30	36	51.1	2	Machined	Aluminum	38	0000000	00000
66.5	40	5	8	Plain	25	30	36	63.85	2	Machined	Aluminum	40	0000000	00000
75.15	48	5	8	Plain	__	30	36	76.55	__	Machined	Aluminum	50	0000000	000000

AT Series Dust-Free Timing Belts

Made of urethane, these belts have excellent abrasion resistance, so they don’t create dust while they run. They’re reinforced with steel for very high strength, low stretch, and excellent shock resistance. All have trapezoidal teeth.

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

10 mm Wd.
Belt Trade Number	Outer Circle, mm	Number of Teeth	Pitch, mm	Material	Color	Temperature Range, °F		Each
10AT5/300	300	60	5	Urethane	Gray	-20° to 175°	0000000	000000
10AT5/340	340	68	5	Urethane	Gray	-20° to 175°	0000000	00000
10AT5/375	375	75	5	Urethane	Gray	-20° to 175°	0000000	00000
10AT5/390	390	78	5	Urethane	Gray	-20° to 175°	0000000	00000
10AT5/420	420	84	5	Urethane	Gray	-20° to 175°	0000000	00000
10AT5/450	450	90	5	Urethane	Gray	-20° to 175°	0000000	00000
10AT5/455	455	91	5	Urethane	Gray	-20° to 175°	0000000	00000
10AT5/480	480	96	5	Urethane	Gray	-20° to 175°	0000000	00000
10AT5/500	500	100	5	Urethane	Gray	-20° to 175°	0000000	00000
10AT5/525	525	105	5	Urethane	Gray	-20° to 175°	0000000	00000
10AT5/545	545	109	5	Urethane	Gray	-20° to 175°	0000000	00000
10AT5/600	600	120	5	Urethane	Gray	-20° to 175°	0000000	00000
16 mm Wd.
16AT5/300	300	60	5	Urethane	Gray	-20° to 175°	0000000	00000
16AT5/375	375	75	5	Urethane	Gray	-20° to 175°	0000000	00000
16AT5/390	390	78	5	Urethane	Gray	-20° to 175°	0000000	00000
16AT5/420	420	84	5	Urethane	Gray	-20° to 175°	0000000	00000
16AT5/450	450	90	5	Urethane	Gray	-20° to 175°	0000000	00000
16AT5/455	455	91	5	Urethane	Gray	-20° to 175°	0000000	00000
16AT5/480	480	96	5	Urethane	Gray	-20° to 175°	0000000	00000
16AT5/525	525	105	5	Urethane	Gray	-20° to 175°	0000000	00000
16AT5/545	545	109	5	Urethane	Gray	-20° to 175°	0000000	00000
16AT5/600	600	120	5	Urethane	Gray	-20° to 175°	0000000	00000
25 mm Wd.
25AT5/300	300	60	5	Urethane	Gray	-20° to 175°	0000000	00000
25AT5/375	375	75	5	Urethane	Gray	-20° to 175°	0000000	00000
25AT5/390	390	78	5	Urethane	Gray	-20° to 175°	0000000	00000
25AT5/420	420	84	5	Urethane	Gray	-20° to 175°	0000000	00000
25AT5/450	450	90	5	Urethane	Gray	-20° to 175°	0000000	00000
25AT5/455	455	91	5	Urethane	Gray	-20° to 175°	0000000	00000
25AT5/480	480	96	5	Urethane	Gray	-20° to 175°	0000000	00000
25AT5/525	525	105	5	Urethane	Gray	-20° to 175°	0000000	00000
25AT5/545	545	109	5	Urethane	Gray	-20° to 175°	0000000	00000
25AT5/600	600	120	5	Urethane	Gray	-20° to 175°	0000000	00000