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

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