20B51

Metric Roller Chain Sprocket

Item #100966987

40 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.

Manufactured of high carbon steel
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

Specifications

Series	B
Width Across Teeth	18.59 mm
Chain Pitch	31.75 mm
Hardened Teeth	Without Hardened Teeth
Inch/Metric	Metric
Hub Dia.	127 mm
Pitch Diameter	515.7 mm
Pin Diameter	19.05 mm
Family Name	No. 20 - 31.750 mm Pitch - Single - Type B & C
Chain No.	20B, 20B-1
Pitch Diameter [Min]	515.7 mm
Outside Dia.	536.39 mm
Caliper Diameter	496.45 mm
Material	Steel
Bore Range [Min]	40 mm
No. of Teeth	51
Bore Style	Minimum Bore
Martin No.	20B51
Sprocket Style	B
Length Through Bore	64.01 mm
Hub Length Thru	64 mm
No. of Strands Across	1
Pitch Root Diameter	496.7 mm
Bore Type	Reborable
Single Strand Tooth Thickness	18.59 mm
Root Diameter	496.7 mm
Bore Range [Max]	86 mm
Outside Dia. [Min]	536.39 mm
Weight	78.02 LB
EAN or UPC	697950404509