D28B21

Metric Roller Chain Sprocket

Item #100967421

40 mm Minimum Bore

126 mm Maximum Bore

+ Show More

Auto Replenish

each One-time purchase

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

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