19.05 mm Gears | McMaster-Carr

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	Roller Chain Trade Size Roller Chain Trade Size

12B

12B-2

	Number of Teeth Number of Teeth

	System of Measurement System of Measurement

Metric

	For Shaft Diameter For Shaft Diameter

12mm

16 mm

20mm

	For Maximum Shaft Diameter For Maximum Shaft Diameter

	OD OD

	Pitch Pitch	Show

19.05 mm

	Pitch Pitch	Hide

	Bore Type Bore Type

Machinable

Finished

Bushing

	For Roller Chain Strand Type For Roller Chain Strand Type


Single	Double

	For Shaft Type For Shaft Type

	Round

	Hub Diameter Hub Diameter

	Specifications Met Specifications Met

ISO

DIN

	ID ID

12 mm

16 mm

20 mm

	Sprocket Type Sprocket Type

Standard

Idler

	Overall Width Overall Width

	Roller Chain Standard Roller Chain Standard

ISO

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

REACH Compliant

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

DFARS Specialty Metals
COTS-Exempt

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

RoHS Compliant

	Material Material

Steel

	Bearing Material Bearing Material

Steel

	Bearing Seal Type Bearing Seal Type

Double Sealed

	Bearing Type Bearing Type

	Ball

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15 Products

About Roller Chain and Sprockets

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 12B Roller Chain (19.05 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
11	12	32	79.36	35	47	Steel	DIN 8187, ISO 606	00000000	000000
12	12	35	85.35	35	53	Steel	DIN 8187, ISO 606	00000000	00000
14	12	42	97.36	35	64	Steel	DIN 8187, ISO 606	00000000	00000
15	12	45	103.37	35	70	Steel	DIN 8187, ISO 606	00000000	00000
16	16	50	109.39	35	75	Steel	DIN 8187, ISO 606	00000000	00000
17	16	52	115.42	35	80	Steel	DIN 8187, ISO 606	00000000	00000
18	16	52	121.45	35	80	Steel	DIN 8187, ISO 606	00000000	00000
19	16	60	127.49	35	90	Steel	DIN 8187, ISO 606	00000000	00000

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 12B-2 Roller Chain (19.05 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
15	16	45	103.37	50	71	Steel	DIN 8187, ISO 606	00000000	0000000
17	20	54	115.42	50	83	Steel	DIN 8187, ISO 606	00000000	000000
19	20	62	127.49	50	95	Steel	DIN 8187, ISO 606	00000000	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 12B Roller Chain (19.05 mm Pitch)
15	16	100	18	40	Steel	Ball	Steel	ISO 606	0000000	000000

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 12B Roller Chain (19.05 mm Pitch)
Number of Teeth	For Bushing Style	OD, mm	Overall Wd., mm	Hub Dia., mm	Teeth Heat Treatment	Material	Specifications Met		Each
13	1210	89.92	25	62.69	Hardened	Steel	DIN 8187, ISO 606	00000000	000000
15	1610	101.85	25	70.64	Hardened	Steel	DIN 8187, ISO 606	00000000	00000
19	1610	125.98	25	82.55	Hardened	Steel	DIN 8187, ISO 606	00000000	000000