28A21

Metric Roller Chain Sprocket

Item #100967154

40.03 mm Minimum Bore

255.58 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.

Chain rows are parallel and precisely spaced to increase longevity of sprocket and chain
Manufactured of high carbon steel
Precise machining and processes ensure consistent finish and high quality
Bores are concentric to pitch line, minimizing run out

Specifications

Width Across Teeth	29.44 mm
Bore Range [Min]	40.03 mm
Chain No.	28B, 28B-1
Single Strand Tooth Thickness	29.44 mm
No. of Teeth	21
Root Diameter	270.3 mm
Hub Projection	N/A
Material	Steel
Bore Style	Minimum Bore
Hub Length Thru	N/A
Chain Pitch	44.45 mm
Length Through Bore	29.44 mm
Pitch Diameter [Min]	298.2 mm
Bore Type	Reborable
Family Name	No. 28 - 44.450 mm Pitch - Single - A
Outside Dia. [Min]	325.86 mm
Inch/Metric	Metric
No. of Strands Across	1
Pitch Diameter	298.2 mm
Martin No.	28A21
Caliper Diameter	269.46 mm
Series	A
Pin Diameter	27.94 mm
Hub Dia.	N/A
Hardened Teeth	Without Hardened Teeth
Sprocket Style	A
Bore Range [Max]	255.58 mm
Outside Dia.	325.86 mm
Pitch Root Diameter	270.3 mm
Weight	25.99 LB
EAN or UPC	697950406732