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

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