20B30

Metric Roller Chain Sprocket

Item #100966966

31.88 mm Minimum Bore

90 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

Root Diameter	284.7 mm
Hub Dia.	127 mm
Material	Steel
Bore Range [Min]	31.88 mm
No. of Strands Across	1
Length Through Bore	51.05 mm
Pitch Root Diameter	284.7 mm
Single Strand Tooth Thickness	18.59 mm
Bore Range [Max]	90 mm
Hub Length Thru	32.41 mm
Inch/Metric	Metric
Outside Dia. [Min]	324.38 mm
Width Across Teeth	18.59 mm
Chain No.	20B, 20B-1
Outside Dia.	324.38 mm
Hardened Teeth	Without Hardened Teeth
No. of Teeth	30
Series	B
Chain Pitch	31.75 mm
Bore Type	Reborable
Pitch Diameter [Min]	303.7 mm
Caliper Diameter	284.7 mm
Bore Style	Minimum Bore
Pitch Diameter	303.7 mm
Family Name	No. 20 - 31.750 mm Pitch - Single - Type B & C
Pin Diameter	19.05 mm
Martin No.	20B30
Sprocket Style	B
Weight	40.7 LB
EAN or UPC	697950404080