12.7 mm Gears | McMaster-Carr

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	Number of Teeth Number of Teeth

9
10
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13
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16
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	Roller Chain Trade Size Roller Chain Trade Size

08B

08B-2

	System of Measurement System of Measurement

Metric

	Pitch Pitch	Show

12.7 mm

	Pitch Pitch	Hide

	OD OD

	For Shaft Diameter For Shaft Diameter

	For Maximum Shaft Diameter For Maximum Shaft Diameter

	Bore Type Bore Type

Machinable

Finished

Bushing

	Overall Width Overall Width

	For Roller Chain Strand Type For Roller Chain Strand Type


Single	Double

	Material Material

Steel

Stainless Steel

	Sprocket Type Sprocket Type

Standard

Idler

	Specifications Met Specifications Met

ISO

DIN

	Roller Chain Standard Roller Chain Standard

ISO

	ID ID

	For Shaft Type For Shaft Type

	Round

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

	Hub Diameter Hub Diameter

	Bearing Type Bearing Type

	Ball

	Bearing Seal Type Bearing Seal Type

Double Sealed

	For Bushing Type For Bushing Type

Taper Lock

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67 Products

About Roller Chain and Sprockets

With metric teeth and slim profile, these sprockets allow your ISO roller chain to reach narrow spaces. They're commonly referred to as A-plate sprockets. Machine the unfinished bore to fit your shaft—sprockets come machined to the shaft diameter listed and are machinable up to the maximum shaft diameter size. Sprockets meet DIN 8187 and ISO 606, international standards for sprockets and roller chains.

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

For ISO 08B Roller Chain (12.7 mm Pitch)
Number of Teeth	For Shaft Dia., mm	For Max. Shaft Dia., mm	OD, mm	Overall Wd., mm	Material	Specifications Met		Each
13	10	38	59.94	8	Steel	DIN 8187, ISO 606	00000000	000000
14	10	43	64.01	8	Steel	DIN 8187, ISO 606	00000000	00000
15	10	47	67.82	8	Steel	DIN 8187, ISO 606	00000000	00000
16	10	51	71.88	8	Steel	DIN 8187, ISO 606	00000000	00000
17	10	55	75.95	8	Steel	DIN 8187, ISO 606	00000000	00000
18	10	59	80.01	8	Steel	DIN 8187, ISO 606	00000000	00000
20	10	67	88.14	8	Steel	DIN 8187, ISO 606	00000000	00000
21	12	71	91.95	8	Steel	DIN 8187, ISO 606	00000000	00000
22	12	75	96.01	8	Steel	DIN 8187, ISO 606	00000000	00000
24	12	83	104.14	8	Steel	DIN 8187, ISO 606	00000000	00000
25	12	87	108.2	8	Steel	DIN 8187, ISO 606	00000000	00000
26	16	92	112.27	8	Steel	DIN 8187, ISO 606	00000000	00000
27	16	96	116.33	8	Steel	DIN 8187, ISO 606	00000000	00000
32	15	116	136.4	8	Steel	DIN 8187, ISO 606	00000000	00000
36	15	132	152.65	8	Steel	DIN 8187, ISO 606	00000000	00000
37	15	136	156.72	8	Steel	DIN 8187, ISO 606	00000000	00000
39	18	144	164.59	8	Steel	DIN 8187, ISO 606	00000000	00000

Sprockets for Metric Roller Chain

Designed to meet ISO 606 and DIN 8187 international dimensional standards, these sprockets are for use with compatible ISO and DIN roller chain. They come machined to the shaft diameter size listed and are machinable up to the maximum shaft diameter size.

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

For ISO 08B Roller Chain (12.7 mm Pitch)
Number of Teeth	For Shaft Dia., mm	For Max. Shaft Dia., mm	OD, mm	Overall Wd., mm	Hub Dia., mm	Material	Specifications Met		Each
9	10	15	43.4	25	21	Steel	DIN 8187, ISO 606	00000000	000000
10	10	20	47.4	25	26	Steel	DIN 8187, ISO 606	00000000	00000
11	10	22	51.4	25	30	Steel	DIN 8187, ISO 606	00000000	00000
12	10	22	55.88	28	34	Steel	DIN 8187, ISO 606	0000000	00000
13	10	25	59.4	28	38	Steel	DIN 8187, ISO 606	00000000	00000
14	10	28	64.01	28	42	Steel	DIN 8187, ISO 606	0000000	00000
15	10	30	67.82	28	46	Steel	DIN 8187, ISO 606	0000000	00000
16	12	32	71.88	28	50	Steel	DIN 8187, ISO 606	0000000	00000
17	12	35	75.95	28	54	Steel	DIN 8187, ISO 606	0000000	00000
18	12	38	80.01	28	57	Steel	DIN 8187, ISO 606	0000000	00000
19	12	40	84.07	28	64	Steel	DIN 8187, ISO 606	0000000	00000
20	12	42	88.14	28	67	Steel	DIN 8187, ISO 606	0000000	00000
21	12	45	91.95	28	70	Steel	DIN 8187, ISO 606	0000000	00000
22	12	48	96.01	28	73	Steel	DIN 8187, ISO 606	0000000	00000
23	12	51	99.6	28	78	Steel	DIN 8187, ISO 606	00000000	00000
24	14	53	103.6	28	82	Steel	DIN 8187, ISO 606	00000000	00000
25	14	53	108.2	28	82	Steel	DIN 8187, ISO 606	0000000	00000
26	16	53	111.7	30	82	Steel	DIN 8187, ISO 606	00000000	00000
27	16	53	115.7	30	82	Steel	DIN 8187, ISO 606	00000000	00000
28	16	53	119.7	30	82	Steel	DIN 8187, ISO 606	00000000	00000
29	16	53	123.8	30	82	Steel	DIN 8187, ISO 606	00000000	00000
30	16	53	128.27	30	89	Steel	DIN 8187, ISO 606	0000000	00000
33	16	60	140.97	30	89	Steel	DIN 8187, ISO 606	00000000	00000
36	16	60	152.78	35	89	Steel	DIN 8187, ISO 606	00000000	00000
40	19	60	168.99	35	89	Steel	DIN 8187, ISO 606	00000000	000000

Machinable-Bore Corrosion-Resistant Sprockets for Metric Roller Chain

Machine the center of these sprockets to fit the exact dimensions of your shaft. They come machined to the shaft diameter size listed and are machinable up to the maximum shaft diameter size. The teeth are sized to fit into metric ISO roller chain. Made from stainless steel, they won’t corrode from humidity or frequent washdowns. The extended hub makes these sprockets more stable and more durable than sprockets with flat hubs. They meet ISO 606 (formerly DIN 8187), which is an international standard for dimensions and materials.

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

For ISO 08B Roller Chain (12.7 mm Pitch)
Number of Teeth	For Shaft Dia., mm	For Max. Shaft Dia., mm	OD, mm	Overall Wd., mm	Hub Dia., mm	Material	Specifications Met		Each
12	10	22	56.44	28	34	Stainless Steel	DIN 8187, ISO 606	0000000	0000000
15	10	30	68.45	28	46	Stainless Steel	DIN 8187, ISO 606	0000000	000000
18	12	38	80.5	28	57	Stainless Steel	DIN 8187, ISO 606	0000000	000000

Sprockets for Double-Strand Metric Roller Chain

The double row of teeth on these sprockets are designed to fit into metric ISO double-strand roller chain. They have an unfinished bore that’s machined to the shaft diameter size listed. Machine them to fit any shaft up to the maximum shaft diameter size. The extended hub makes these sprockets more stable and more durable than flat sprockets. They meet ISO 606 (formerly DIN 8187), which is an international standard for sprocket and roller chain dimensions and materials.

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

For ISO 08B-2 Roller Chain (12.7 mm Pitch)
Number of Teeth	For Shaft Dia., mm	For Max. Shaft Dia., mm	OD, mm	Overall Wd., mm	Hub Dia., mm	Material	Specifications Met		Each
12	12	23	56.44	35	34	Steel	DIN 8187, ISO 606	00000000	000000
16	14	33	72.46	35	50	Steel	DIN 8187, ISO 606	0000000	00000
17	14	36	76.48	35	54	Steel	DIN 8187, ISO 606	00000000	00000
18	14	38	80.5	35	58	Steel	DIN 8187, ISO 606	00000000	000000
20	14	40	88.55	35	66	Steel	DIN 8187, ISO 606	00000000	000000
21	16	45	92.58	40	70	Steel	DIN 8187, ISO 606	00000000	000000
26	20	56	112.73	40	85	Steel	DIN 8187, ISO 606	0000000	000000
30	20	64	128.86	40	100	Steel	DIN 8187, ISO 606	00000000	000000
36	20	73	153.08	40	110	Steel	DIN 8187, ISO 606	00000000	000000
38	20	73	161.16	45	110	Steel	DIN 8187, ISO 606	00000000	000000
42	20	73	177.31	45	110	Steel	DIN 8187, ISO 606	0000000	000000

Idler Sprockets for Metric Roller Chain

Keep constant tension on your drive with these sprockets that press against your metric ISO roller chain to take up slack and reduce wear and vibration. They rotate freely on built-in ball bearings, which are double sealed to keep dirt out, and are for use with roller chain tensioners. All come with a finished bore that fits directly onto your shaft—no need for machining. These sprockets meet ISO 606, which is an international standard for dimensions and materials.

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

						Bearing
Number of Teeth	For Shaft Dia., mm	OD, mm	Overall Wd., mm	Hub Dia., mm	Material	Type	Material	Specifications Met		Each
For ISO 08B Roller Chain (12.7 mm Pitch)
16	16	69.5	18	40	Steel	Ball	Steel	ISO 606	0000000	000000
18	16	78	18	40	Steel	Ball	Steel	ISO 606	0000000	00000

Taper-Lock Bushing-Bore Sprockets for Metric Roller Chain

While their teeth fit into metric ISO roller chain, these sprockets use taper-lock bushings to grip shafts. That means you can switch to a different diameter shaft by changing the bushing instead of machining the sprocket. Bushings mount flush inside these sprockets; secure them in place by tightening the set screws included with the bushings. These sprockets have an extended hub that makes them more stable and durable than flat sprockets. All meet ISO 606 (formerly DIN 8187), which is an international standard for sprocket and roller chain dimensions and materials.

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

For Single-Strand Roller Chain

For ISO 08B Roller Chain (12.7 mm Pitch)
Number of Teeth	For Bushing Style	OD, mm	Overall Wd., mm	Hub Dia., mm	Teeth Heat Treatment	Material	Specifications Met		Each
14	1008	64.01	22	46	Hardened	Steel	DIN 8187, ISO 606	00000000	000000
15	1008	67.82	22	46	Hardened	Steel	DIN 8187, ISO 606	00000000	00000
17	1210	75.95	25	60	Hardened	Steel	DIN 8187, ISO 606	00000000	00000
18	1210	80.01	25	62	Hardened	Steel	DIN 8187, ISO 606	00000000	00000
21	1610	91.95	25	70	Hardened	Steel	DIN 8187, ISO 606	00000000	00000
24	1610	104.14	25	82	Hardened	Steel	DIN 8187, ISO 606	00000000	00000
25	1610	108.2	25	82	Hardened	Steel	DIN 8187, ISO 606	00000000	00000
32	1610	136.4	25	76	__	Steel	DIN 8187, ISO 606	00000000	000000
38	1610	160.53	25	76	__	Steel	DIN 8187, ISO 606	00000000	000000

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About Roller Chain and Sprockets

Flat Sprockets for Metric Roller Chain

Sprockets for Metric Roller Chain

Machinable-Bore Corrosion-Resistant Sprockets for Metric Roller Chain

Sprockets for Double-Strand Metric Roller Chain

Idler Sprockets for Metric Roller Chain

Taper-Lock Bushing-Bore Sprockets for Metric Roller Chain