AT5 Series Timing Belts | McMaster-Carr

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Timing Belt Drive Pulleys

Timing Belts

System of Measurement

Width

Pitch

Outer Circle

Number of Teeth

Belt Trade Size

Tooth Profile

Material

Belt Trade Number

For Maximum Belt Width

Tooth Location

Reinforcement Material

Steel

Color

Gray

Belt Type

Timing

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

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REACH

DFARS Specialty Metals

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Maximum Temperature

Minimum Temperature

Shaft Diameter

Bore Type

Inside Width

68 Products

About Belts

Measure your old V-belt, timing belt, or pulleys to find the right belt replacement if you don’t know the trade size.

Timing Belts

Keep your drive system in sync. Trapezoidal teeth mesh with matching pulleys to transmit power without slipping. With the original tooth profile, these timing belts handle enough torque and synchronization for most applications. If you need high torque or precise starts and stops, consider curved tooth profiles, such as GT and HTD belts.

Abrasion-Resistant Urethane Rubber—Won’t break down or create dust while they run. Plus, they last longer than neoprene belts. Aramid or steel reinforcements provide very high strength and low stretch.

	Pitch, mm	Reinforcement Material	Temp. Range, ° F	Belt Trade No.		Each
Abrasion-Resistant Urethane Rubber







	AT5 Trade Size

	10	300	60	5	Steel	-20 to 175	10-AT5-300	5863N11	000000


	10	340	68	5	Steel	-20 to 175	10-AT5-340	5863N12	00000
	10	375	75	5	Steel	-20 to 175	10-AT5-375	5863N13	00000
	10	390	78	5	Steel	-20 to 175	10-AT5-390	5863N14	00000
	10	420	84	5	Steel	-20 to 175	10-AT5-420	5863N15	00000
	10	450	90	5	Steel	-20 to 175	10-AT5-450	5863N16	00000
	10	455	91	5	Steel	-20 to 175	10-AT5-455	5863N17	00000
	10	480	96	5	Steel	-20 to 175	10-AT5-480	5863N18	00000
	10	500	100	5	Steel	-20 to 175	10-AT5-500	5863N19	00000
	10	525	105	5	Steel	-20 to 175	10-AT5-525	5863N21	00000
	10	545	109	5	Steel	-20 to 175	10-AT5-545	5863N22	00000


	10	600	120	5	Steel	-20 to 175	10-AT5-600	5863N23	00000
	16	300	60	5	Steel	-20 to 175	16-AT5-300	5863N24	00000
	16	375	75	5	Steel	-20 to 175	16-AT5-375	5863N25	00000
	16	390	78	5	Steel	-20 to 175	16-AT5-390	5863N26	00000
	16	420	84	5	Steel	-20 to 175	16-AT5-420	5863N27	00000
	16	450	90	5	Steel	-20 to 175	16-AT5-450	5863N28	00000
	16	455	91	5	Steel	-20 to 175	16-AT5-455	5863N29	00000
	16	480	96	5	Steel	-20 to 175	16-AT5-480	5863N31	00000
	16	525	105	5	Steel	-20 to 175	16-AT5-525	5863N32	00000
	16	545	109	5	Steel	-20 to 175	16-AT5-545	5863N33	00000


	16	600	120	5	Steel	-20 to 175	16-AT5-600	5863N34	00000
	25	300	60	5	Steel	-20 to 175	25-AT5-300	5863N35	00000
	25	375	75	5	Steel	-20 to 175	25-AT5-375	5863N36	00000
	25	390	78	5	Steel	-20 to 175	25-AT5-390	5863N37	00000
	25	420	84	5	Steel	-20 to 175	25-AT5-420	5863N38	00000
	25	450	90	5	Steel	-20 to 175	25-AT5-450	5863N39	00000
	25	455	91	5	Steel	-20 to 175	25-AT5-455	5863N41	00000
	25	480	96	5	Steel	-20 to 175	25-AT5-480	5863N42	00000
	25	525	105	5	Steel	-20 to 175	25-AT5-525	5863N43	00000
	25	545	109	5	Steel	-20 to 175	25-AT5-545	5863N44	00000


	25	600	120	5	Steel	-20 to 175	25-AT5-600	5863N45	00000

Timing Belt Pulleys


Plain Bore

Keep your drive system in sync. Trapezoidal teeth mesh with matching belts to synchronize motion. With the original tooth profile, these pulleys handle enough torque for most applications. If you need high torque or precise starts and stops, consider curved tooth profiles, such as GT and HTD pulleys.

Corrosion-Resistant Aluminum—Won't rust in wet environments and one-third the weight of steel and iron. However, aluminum pulleys are not as strong as iron and steel.

Plain Bore—Do it your way—machine the bore to your exact shaft size or add a set screw or keyway.

	Bore Type	For Shaft Dia., mm	Pitch Dia., mm	No. of Flanges	Hub Type		Each
For AT5 Trade Size







	Corrosion-Resistant Aluminum

	10	5	12	Plain	—	19.3	2	Standard	3709N11	000000


	10	5	15	Plain	—	24.1	2	Standard	3709N13	00000
	10	5	20	Plain	—	32	2	Standard	3709N17	00000
	10	5	22	Plain	—	35.3	2	Standard	3709N18	00000
	10	5	24	Plain	—	38.4	2	Standard	3709N19	00000
	10	5	27	Plain	—	43.2	2	Standard	3709N23	00000
	10	5	30	Plain	8	48	2	Standard	3709N25	00000
	10	5	42	Plain	8	67	2	Standard	3709N29	00000
	10	5	60	Plain	8	95.7	—	Standard	3709N33	00000
	16	5	12	Plain	—	19.3	2	Standard	3709N34	00000
	16	5	18	Plain	—	28.8	2	Standard	3709N38	00000


	16	5	20	Plain	—	32	2	Standard	3709N41	00000
	16	5	22	Plain	—	35.3	2	Standard	3709N42	00000
	16	5	24	Plain	—	38.4	2	Standard	3709N43	00000
	16	5	25	Plain	—	40	2	Standard	3709N44	00000
	16	5	26	Plain	—	41.6	2	Standard	3709N45	00000
	16	5	27	Plain	8	43.2	2	Standard	3709N46	00000
	16	5	28	Plain	8	44.8	2	Standard	3709N47	00000
	16	5	30	Plain	8	48	2	Standard	3709N48	00000
	16	5	32	Plain	8	51.1	2	Standard	3709N49	00000
	16	5	36	Plain	8	57.5	2	Standard	3709N51	00000


	16	5	40	Plain	8	63.9	2	Standard	3709N52	00000
	16	5	42	Plain	8	67	2	Standard	3709N53	00000
	16	5	44	Plain	8	70.2	—	Standard	3709N54	00000
	16	5	60	Plain	8	95.7	—	Standard	3709N56	000000
	25	5	16	Plain	—	25.6	2	Standard	3709N61	00000
	25	5	20	Plain	—	32	2	Standard	3709N64	00000
	25	5	22	Plain	—	35.3	2	Standard	3709N65	00000
	25	5	24	Plain	—	38.4	2	Standard	3709N66	00000
	25	5	25	Plain	—	40	2	Standard	3709N67	00000
	25	5	26	Plain	—	41.6	2	Standard	3709N68	00000


	25	5	27	Plain	8	43.2	2	Standard	3709N69	00000
	25	5	30	Plain	8	48	2	Standard	3709N72	00000
	25	5	32	Plain	8	51.1	2	Standard	3709N73	00000
	25	5	40	Plain	8	63.9	2	Standard	3709N75	00000
	25	5	48	Plain	8	76.6	—	Standard	3709N78	000000