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
Length Through Bore
2 in
Bore Type
Bushed
Chain Pitch
1.750 in
Outside Dia. [Min]
12.66 in
Chain No.
140
Tooth Width
0.924 in
Construction Internal
Welded
Bushing Bore [Max]
3 in
Material
Steel
Pitch Diameter
11.7416 in
Inch/Metric
Inch
Hub Length
1.08 in
Bore Size [Min]
0.938 in
Chain Sprocket Pitch
1.75 in
Bushing Bore Size [Min]
0.938 in
Sprocket Style
B
No. of Strands Across
1
Caliper Diameter
10.7088 in
Martin No.
140BTB21H
Hub Dia.
5 1/4 in
Hardened Teeth
With Hardened Teeth
Outside Dia.
12.66 in
Hub Projection
1.08 in
Chain Sprocket Number
140
Bushing Bore [Min]
0.938 in
Material Internal Use
Carbon Steel
No. of Teeth Rows Strands
1
O.D.
12.66 in
Type
B
No. of Teeth
21
Single Strand Tooth Thickness
0.924 in
Bore Size [Max]
3 in
Bushing Bore Size [Max]
3 in
Overall Length
2 in
Overall Length Less Threads
N/A
Pitch Dia.
11.742 in
Material External Use
Steel
Bushing Series
3020
Hub O.D.
5.25 in
Width Across Teeth
0.924 in
Bushing Type
Taper Lock
Weight
25.2 LB
EAN or UPC
697950043999
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