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

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