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

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