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