No. 40, B Style, 1.188" Finished Bore
All dimensions are nominal values and for reference only
Unit of Measure

Specifications

Hub Diameter_SYN

 2.750 in

Length Through Bore_SYN

 1.000 in

Sprocket Style_SYN

 B

Number of Teeth_SYN

 21

Bore Diameter_SYN

 1.188 in

Max. Bore

 1.875 in

Weight_SYN

 1.530 lb

Tooth Width_SYN

 0.284 in

Hardened Teeth 

 Yes

Industry Equivalent

 40BS21 1 3/16

UPC Code

 097039324559

Chain Technical Data

Chain Pitch_SYN

 0.500 in

Chain Number_SYN

 40

Sprocket Diameters

Outside Diameter_SYN

 3.620 in

Pitch Diameter_SYN

 3.355 in

Caliper Sprocket Diameter at 3/8 in Pitch

 3.033 in