Hardened teeth on the smaller sprocket of a roller chain drive are recommended if the drive ratio is four to one or greater or if the smaller sprocket has 24 teeth or less and is running at a speed of over 600 rpm.
features
Tolerances meet or exceed ANSI standards
Manufactured of high carbon steel
Precise machining and processes ensure consistent finish and high quality
Chain rows are parallel and precisely spaced to increase longevity of sprocket and chain
Bores are concentric to pitch line, minimizing run out
Interchangeable with other manufacturers’ Taper bushings
Stocked Heat Treat
Material Internal Use
Carbon Steel
Overall Length Less Threads
N/A
Single Strand Tooth Thickness
0.284 in
Type
B
Hub Recess Width
0.19 in
Tooth Width
0.284 in
Bore Size [Min]
0.5 in
Martin No.
40BTB20H
Outside Dia.
3.457 in
No. of Teeth
20
Bushing Bore Size [Max]
1.625 in
Hub Recessed
1
Bushing Bore [Min]
0.5 in
Inch/Metric
Inch
Pitch Dia.
3.196 in
Width Across Teeth
1 in
Bushing Type
Taper Lock
Bore Type
Bushed
Length Through Bore
1 in
Hardened Teeth
With Hardened Teeth
Sprocket Style
B
Pitch Diameter
3.1962 in
Overall Length
1 in
Material
Steel
Bushing Bore Size [Min]
0.5 in
Caliper Diameter
2.8842 in
Hub OD @ Recess
2.63 in
Construction Internal
Solid With Recess Groove
No. of Strands Across
1
No. of Teeth Rows Strands
1
Hub Length
0.72 in
Hub O.D.
2.781 in
O.D.
3.457 in
Chain Sprocket Pitch
0.5 in
Bore Size [Max]
1.625 in
Chain Sprocket Number
40
Bushing Series
1610
Hub Projection
0.72 in
Hub Dia.
2.7813 in
Hub Recess Depth
0.08 in
Material External Use
Steel
Chain Pitch
0.500 in
Outside Dia. [Min]
3.457 in
Bushing Bore [Max]
1.625 in
Chain No.
40
Weight
0.7 LB
EAN or UPC
697950043050
We're here for you
with Service Centers across the country - We have your back
Find a Service Center
