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
No. of Teeth Rows Strands
1
Bore Type
Bushed
Pitch Dia.
6.268 in
Hardened Teeth
With Hardened Teeth
Material Internal Use
Carbon Steel
Material
Steel
Sprocket Style
B
Chain Sprocket Pitch
1.5 in
Single Strand Tooth Thickness
0.924 in
Overall Length
1 3/4 in
Chain Pitch
1.500 in
Outside Dia. [Min]
6.9860 in
No. of Strands Across
1
Bushing Type
Taper Lock
Bushing Bore Size [Max]
3.188 in
No. of Teeth
13
Type
B
Chain No.
120
Hub Length
0.83 in
Bushing Series
2517
Bore Size [Max]
3.188 in
Material External Use
Steel
Bushing Bore [Max]
2 1/2 in
Tooth Width
0.924 in
Caliper Diameter
5.3472 in
Length Through Bore
1.75 in
Hub Projection
0.83 in
Overall Length Less Threads
N/A
Martin No.
120BTB13H
Construction Internal
Solid
O.D.
6.986 in
Inch/Metric
Inch
Width Across Teeth
1.75 in
Chain Sprocket Number
120
Pitch Diameter
6.268 in
Hub Dia.
4 1/4 in
Outside Dia.
6.986 in
Hub O.D.
4.25 in
Bushing Bore [Min]
1/2 in
Weight
6.46 LB
EAN or UPC
697950043821
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