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

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