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