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

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