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

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