D28B21

Metric Roller Chain Sprocket

Item #100967421

40 mm Minimum Bore

126 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.

Manufactured of high carbon steel
Precise machining and processes ensure consistent finish and high quality
Bores are concentric to pitch line, minimizing run out
Chain rows are parallel and precisely spaced to increase longevity of sprocket and chain

Specifications

Pitch Diameter [Min]	298.2 mm
Bore Type	Reborable
Bore Range [Max]	126 mm
Outside Dia.	325.86 mm
Bore Style	Minimum Bore
Family Name	No. 28 - 44.450 mm Pitch - Double - Type B & C
Outside Dia. [Min]	325.86 mm
No. of Strands Across	2
No. of Teeth	21
Pin Diameter	27.94 mm
Martin No.	28B21
Sprocket Style	B
Hardened Teeth	Without Hardened Teeth
Caliper Diameter	269.46 mm
Series	B
Pitch Root Diameter	270.3 mm
Width Across Teeth	88.39 mm
Inch/Metric	Metric
Chain No.	28B, 28B-2
Pitch Diameter	298.2 mm
Hub Length Thru	90.64 mm
Length Through Bore	120.02 mm
Hub Dia.	178 mm
Material	Steel
Root Diameter	270.3 mm
Single Strand Tooth Thickness	28.83 mm
Bore Range [Min]	40 mm
Chain Pitch	44.45 mm
Weight	102.9 LB
EAN or UPC	697950407265