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

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