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
Bushing Bore [Min]
0.938 in
Outside Dia. [Min]
10.3710 in
Bushing Bore Size [Max]
3 in
Chain Pitch
1.500 in
Bushing Bore [Max]
3 in
Caliper Diameter
8.7137 in
Width Across Teeth
0.924 in
Overall Length
2 in
Hardened Teeth
With Hardened Teeth
No. of Teeth Rows Strands
1
Bushing Bore Size [Min]
0.938 in
O.D.
10.371 in
Bushing Series
3020
Inch/Metric
Inch
Martin No.
120BTB20H
No. of Strands Across
1
Bore Size [Min]
0.938 in
Chain Sprocket Number
120
Construction Internal
Welded
Hub O.D.
5.25 in
Sprocket Style
B
Hub Dia.
5 1/4 in
Single Strand Tooth Thickness
0.924 in
Chain No.
120
Hub Projection
1.08 in
Material Internal Use
Carbon Steel
Material External Use
Steel
Pitch Diameter
9.589 in
Chain Sprocket Pitch
1.5 in
Hub Length
1.08 in
Bore Size [Max]
3 in
Outside Dia.
10.371 in
Material
Steel
Tooth Width
0.924 in
No. of Teeth
20
Length Through Bore
2 in
Type
B
Pitch Dia.
9.589 in
Bore Type
Bushed
Bushing Type
Taper Lock
Overall Length Less Threads
N/A
Weight
16.7 LB
EAN or UPC
697950065724
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