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

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