28A12

Metric Roller Chain Sprocket

Item #100967145

32.02 mm Minimum Bore

126.57 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

Hub Projection	N/A
Hub Dia.	N/A
Outside Dia. [Min]	199.36 mm
Caliper Diameter	143.8 mm
Material	Steel
Hardened Teeth	Without Hardened Teeth
Martin No.	28A12
No. of Teeth	12
Bore Style	Minimum Bore
Single Strand Tooth Thickness	29.44 mm
Width Across Teeth	29.44 mm
Pitch Diameter [Min]	171.7 mm
Inch/Metric	Metric
Bore Type	Reborable
Pin Diameter	27.94 mm
Pitch Diameter	171.7 mm
Chain Pitch	44.45 mm
Bore Range [Min]	32.02 mm
Pitch Root Diameter	143.8 mm
Family Name	No. 28 - 44.450 mm Pitch - Single - A
Root Diameter	143.8 mm
No. of Strands Across	1
Outside Dia.	199.36 mm
Bore Range [Max]	126.57 mm
Hub Length Thru	N/A
Series	A
Chain No.	28B, 28B-1
Length Through Bore	29.44 mm
Sprocket Style	A
Weight	8.7 LB
EAN or UPC	697950406558