20A12

Metric Roller Chain Sprocket

Item #100966886

25.02 mm Minimum Bore

90.26 mm Maximum 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.

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
Manufactured of high carbon steel

Specifications

Series	A
Pitch Diameter	122.7 mm
Hub Projection	N/A
Outside Dia. [Min]	143.31 mm
Root Diameter	103.6 mm
Caliper Diameter	103.62 mm
Family Name	No. 20 - 31.750 mm Pitch - Single - A
Outside Dia.	143.31 mm
Length Through Bore	18.59 mm
Pitch Diameter [Min]	122.7 mm
Chain No.	20B, 20B-1
No. of Strands Across	1
Hub Dia.	N/A
Single Strand Tooth Thickness	18.59 mm
Chain Pitch	31.75 mm
Pin Diameter	19.05 mm
No. of Teeth	12
Bore Style	Minimum Bore
Bore Range [Min]	25.02 mm
Bore Type	Reborable
Inch/Metric	Metric
Width Across Teeth	18.59 mm
Hardened Teeth	Without Hardened Teeth
Sprocket Style	A
Bore Range [Max]	90.26 mm
Material	Steel
Pitch Root Diameter	103.6 mm
Hub Length Thru	N/A
Martin No.	20A12
Weight	4.21 LB
EAN or UPC	697950403731