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

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