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’ QD bushings
Stocked Heat Treat
Bushing Series
E
Type
B
Martin No.
120E21H
Overall Length
1 5/8 in
Tooth Width
0.924 in
Chain No.
120
Bushing Type
QD
Construction Internal
Solid
Sprocket Style
B
No. of Strands Across
1
Outside Dia. [Min]
10.8520 in
Bore Size [Min]
0.875 in
Outside Dia.
10.852 in
O.D.
10.852 in
Hardened Teeth
With Hardened Teeth
Chain Pitch
1.500 in
Bore Type
Bushed
Material Internal Use
Carbon Steel
Single Strand Tooth Thickness
0.924 in
Hub Projection
0.7 in
Pitch Dia.
10.064 in
Bushing Bore Size [Max]
3.313 in
Bushing Bore [Max]
3 1/2 in
Chain Sprocket Pitch
1.5 in
No. of Teeth
21
Bushing Bore [Min]
0.875 in
Overall Length Less Threads
N/A
Caliper Diameter
9.1612 in
Pitch Diameter
10.064 in
Material External Use
Steel
Width Across Teeth
0.924 in
Length Through Bore
1.625 in
Inch/Metric
Inch
No. of Teeth Rows Strands
1
Hub Length
0.7 in
Hub O.D.
6.25 in
Bore Size [Max]
3.313 in
Material
Steel
Bushing Bore Size [Min]
0.875 in
Hub Dia.
6 1/4 in
Screw Size
1/2-13 NC
Chain Sprocket Number
120
Weight
19.68 LB
EAN or UPC
697950042572
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