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
Hardened teeth sprockets afford longer chain and sprocket life
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
Single Strand Tooth Thickness
0.924 in
Martin No.
140BTB12H
Chain Sprocket Pitch
1.75 in
Bore Size [Min]
0.5 in
Hub O.D.
4.25 in
Pitch Diameter
6.762 in
Bushing Bore [Max]
2 1/2 in
Bushing Bore Size [Max]
2.5 in
Hub Projection
0.83 in
Material External Use
Steel
Inch/Metric
Inch
Tooth Width
0.924 in
Construction Internal
Solid
No. of Strands Across
1
Bushing Type
Taper Lock
Width Across Teeth
0.924 in
Bore Size [Max]
2.5 in
Sprocket Style
B
Type
B
Chain No.
140
Caliper Diameter
5.7615 in
Bushing Series
2517
Hub Dia.
4 1/4 in
Outside Dia. [Min]
7.5810 in
Hardened Teeth
With Hardened Teeth
Chain Pitch
1.750 in
Material
Steel
Material Internal Use
Carbon Steel
Overall Length
1 3/4 in
Bushing Bore [Min]
0.5 in
Pitch Dia.
6.762 in
Length Through Bore
1.75 in
Chain Sprocket Number
140
Hub Length
0.83 in
O.D.
7.581 in
Overall Length Less Threads
N/A
Bushing Bore Size [Min]
0.5 in
Outside Dia.
7.581 in
Bore Type
Bushed
No. of Teeth
12
No. of Teeth Rows Strands
1
Weight
8.06 LB
EAN or UPC
697950043913
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