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
Bore Type
Bushed
Bushing Bore [Min]
0.938 in
Inch/Metric
Inch
Length Through Bore
2 in
No. of Teeth
17
Hardened Teeth
With Hardened Teeth
Bushing Series
3020
Material Internal Use
Carbon Steel
Overall Length
2 in
Hub Length
1.08 in
Bushing Bore [Max]
3 in
Pitch Diameter
8.163 in
Bushing Type
Taper Lock
Bore Size [Max]
3 in
No. of Teeth Rows Strands
1
Chain Sprocket Number
120
Material
Steel
Construction Internal
Welded
Bushing Bore Size [Min]
0.938 in
No. of Strands Across
1
Pitch Dia.
8.163 in
Hub Dia.
5 1/4 in
Overall Length Less Threads
N/A
Type
B
Tooth Width
0.924 in
Hub O.D.
5.25 in
Single Strand Tooth Thickness
0.924 in
Chain Sprocket Pitch
1.5 in
Hub Projection
1.08 in
Material External Use
Steel
Bore Size [Min]
0.938 in
Width Across Teeth
0.924 in
Caliper Diameter
7.2535 in
Martin No.
120BTB17H
Chain Pitch
1.500 in
Outside Dia.
8.924 in
Chain No.
120
Outside Dia. [Min]
8.9240 in
Sprocket Style
B
Bushing Bore Size [Max]
3 in
O.D.
8.924 in
Weight
11.82 LB
EAN or UPC
697950043869
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