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

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