12A39

Metric Roller Chain Sprocket

Item #100966371

24.02 mm Minimum Bore

218.44 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

Bore Range [Min]	24.02 mm
Inch/Metric	Metric
Series	A
No. of Teeth	39
Chain No.	12B, 12B-1
Outside Dia. [Min]	248.49 mm
Hub Dia.	N/A
Hub Length Thru	N/A
Length Through Bore	11.1 mm
Hardened Teeth	Without Hardened Teeth
Root Diameter	224.7 mm
Hub Projection	N/A
Pitch Root Diameter	224.7 mm
Chain Pitch	19.05 mm
Pitch Diameter	236.7 mm
Single Strand Tooth Thickness	11.1 mm
Caliper Diameter	224.49 mm
Material	Steel
Martin No.	12A39
Pin Diameter	12.065 mm
Pitch Diameter [Min]	236.7 mm
Outside Dia.	248.49 mm
Bore Style	Minimum Bore
Bore Range [Max]	218.44 mm
Width Across Teeth	11.1 mm
Bore Type	Reborable
No. of Strands Across	1
Family Name	No. 12 - 19.050 mm Pitch - Single - A
Sprocket Style	A
Weight	8.53 LB
EAN or UPC	697950400860