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

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