12A40

Metric Roller Chain Sprocket

Item #100966372

24.02 mm Minimum Bore

224.52 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 Type	Reborable
Hardened Teeth	Without Hardened Teeth
Martin No.	12A40
Pin Diameter	12.065 mm
Inch/Metric	Metric
Family Name	No. 12 - 19.050 mm Pitch - Single - A
Bore Range [Max]	224.52 mm
No. of Strands Across	1
Pitch Diameter [Min]	242.8 mm
Sprocket Style	A
Hub Dia.	N/A
Single Strand Tooth Thickness	11.1 mm
Width Across Teeth	11.1 mm
Pitch Diameter	242.8 mm
Series	A
Hub Length Thru	N/A
No. of Teeth	40
Length Through Bore	11.1 mm
Bore Style	Minimum Bore
Outside Dia. [Min]	254.55 mm
Outside Dia.	254.55 mm
Chain No.	12B, 12B-1
Chain Pitch	19.05 mm
Material	Steel
Root Diameter	230.7 mm
Caliper Diameter	230.74 mm
Pitch Root Diameter	230.7 mm
Bore Range [Min]	24.02 mm
Hub Projection	N/A
Weight	17.64 LB
EAN or UPC	697950400884