08A21

Metric Roller Chain Sprocket

Item #100966143

12 mm Minimum Bore

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Product Details

Maximum bores shown will accommodate standard keyseat and setscrew over keyseat. Slightly larger bores are possible with no keyseat, shallow keyseat, or setscrew at an angle to keyseat.

Manufactured of high carbon steel
Precise machining and processes ensure consistent finish and high quality
Bores are concentric to pitch line, minimizing run out
Chain rows are parallel and precisely spaced to increase longevity of sprocket and chain

Specifications

Bore Range [Min]	12 mm
No. of Teeth	21
No. of Strands Across	1
Single Strand Tooth Thickness	7.37 mm
Width Across Teeth	5.31 mm
Hardened Teeth	Without Hardened Teeth
Caliper Diameter	10.01 mm
Bore Range [Max]	N/A
Pitch Diameter [Min]	85.2 mm
Family Name	No. 08 - 12.700 mm Pitch - Single - A
Pitch Root Diameter	76.7 mm
Hub Dia.	N/A
Pitch Diameter	85.2 mm
Hub Projection	N/A
Material	Steel
Hub Length Thru	N/A
Root Diameter	76.7 mm
Chain No.	08B, 08B-1
Chain Pitch	12.7 mm
Inch/Metric	Metric
Series	A
Martin No.	08A21
Outside Dia. [Min]	92.58 mm
Bore Style	Minimum Bore
Length Through Bore	5.31 mm
Sprocket Style	A
Outside Dia.	92.58 mm
Bore Type	Reborable
Pin Diameter	8.509 mm
Weight	0.57 LB
EAN or UPC	697950397016