20B40

Metric Roller Chain Sprocket

Item #100966976

31.72 mm Minimum Bore

86 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.

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
Precise machining and processes ensure consistent finish and high quality

Specifications

Hardened Teeth	Without Hardened Teeth
Series	B
Caliper Diameter	385.62 mm
Pitch Diameter [Min]	404.7 mm
Outside Dia. [Min]	425.31 mm
Length Through Bore	64.01 mm
Bore Range [Max]	86 mm
Root Diameter	385.6 mm
Single Strand Tooth Thickness	18.59 mm
Bore Type	Reborable
Pitch Diameter	404.7 mm
Width Across Teeth	18.59 mm
No. of Strands Across	1
Chain Pitch	31.75 mm
Pin Diameter	19.05 mm
Outside Dia.	425.31 mm
Inch/Metric	Metric
Sprocket Style	B
Chain No.	20B, 20B-1
Bore Range [Min]	31.72 mm
Hub Dia.	127 mm
No. of Teeth	40
Family Name	No. 20 - 31.750 mm Pitch - Single - Type B & C
Bore Style	Minimum Bore
Pitch Root Diameter	385.6 mm
Hub Length Thru	64 mm
Martin No.	20B40
Material	Steel
Weight	46.89 LB
EAN or UPC	697950404288