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