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

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