D12B21

Metric Roller Chain Sprocket

Item #100965872

20 mm Minimum Bore

70 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 [Min]	127.8 mm
Bore Type	Reborable
Pitch Diameter	127.8 mm
Series	B
No. of Strands Across	2
No. of Teeth	21
Hardened Teeth	Without Hardened Teeth
Outside Dia.	139.56 mm
Inch/Metric	Metric
Hub Length Thru	39.13 mm
Length Through Bore	50.01 mm
Pin Diameter	12.065 mm
Pitch Root Diameter	115.8 mm
Bore Style	Minimum Bore
Caliper Diameter	115.39 mm
Width Across Teeth	30.33 mm
Sprocket Style	B
Bore Range [Min]	20 mm
Bore Range [Max]	70 mm
Hub Dia.	100 mm
Outside Dia. [Min]	139.56 mm
Single Strand Tooth Thickness	10.87 mm
Chain No.	12B, 12B-2
Material	Steel
Family Name	No. 12 - 19.050 mm Pitch - Double - Type B & C
Root Diameter	115.8 mm
Chain Pitch	19.05 mm
Martin No.	12B21
Weight	9.07 LB
EAN or UPC	697950401416