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
Tooth Width
0.284 in
Overall Length
1 in
Hardened Teeth
With Hardened Teeth
Sprocket Style
B
Martin No.
40BTB20H
Pitch Diameter
3.1962 in
Hub Projection
0.72 in
Single Strand Tooth Thickness
0.284 in
Caliper Diameter
2.8842 in
Bore Type
Bushed
Material External Use
Steel
Outside Dia. [Min]
3.457 in
Pitch Dia.
3.196 in
Chain Sprocket Pitch
0.5 in
Construction Internal
Solid With Recess Groove
Hub Recess Width
0.19 in
No. of Teeth Rows Strands
1
Material Internal Use
Carbon Steel
Bore Size [Min]
0.5 in
Inch/Metric
Inch
Bushing Type
Taper Lock
Hub O.D.
2.781 in
Hub OD @ Recess
2.63 in
Type
B
No. of Teeth
20
Material
Steel
Overall Length Less Threads
N/A
Length Through Bore
1 in
Hub Recess Depth
0.08 in
Chain Pitch
0.500 in
Chain Sprocket Number
40
Width Across Teeth
1 in
Hub Recessed
1
Hub Dia.
2.7813 in
Bushing Series
1610
Outside Dia.
3.457 in
Bore Size [Max]
1.625 in
No. of Strands Across
1
Hub Length
0.72 in
Bushing Bore [Min]
0.5 in
O.D.
3.457 in
Bushing Bore [Max]
1.625 in
Chain No.
40
Bushing Bore Size [Max]
1.625 in
Bushing Bore Size [Min]
0.5 in
Weight
0.7 LB
EAN or UPC
697950043050
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