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