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

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