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