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