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
Bore Size [Min]
0.5 in
Type
B
Bushing Bore [Max]
2 1/2 in
No. of Strands Across
2
Outside Dia. [Min]
5.4260 in
Outside Dia.
5.426 in
Width Across Teeth
1.341 in
Inch/Metric
Inch
Bushing Bore [Min]
0.5 in
Length Through Bore
1.75 in
Bore Size [Max]
2.5 in
Material Internal Use
Carbon Steel
Caliper Diameter
4.55 in
Pitch Dia.
5.032 in
Bushing Bore Size [Min]
0.5 in
Overall Length Less Threads
N/A
Chain Sprocket Number
60
No. of Teeth
21
Chain Sprocket Pitch
0.75 in
Bushing Type
Taper Lock
Bore Type
Bushed
O.D.
5.426 in
No. of Teeth Rows Strands
2
Pitch Diameter
5.030 in
Material
Steel
Chain Pitch
0.750 in
Sprocket Style
B
Hub Projection
0.41 in
Single Strand Tooth Thickness
0.444 in
Hub O.D.
4.188 in
Material External Use
Steel
Overall Length
1 3/4 in
Hub Dia.
4 3/16 in
Martin No.
60BTB21H
Chain No.
60-2
Bushing Series
2517
Construction Internal
Solid
Hardened Teeth
With Hardened Teeth
Hub Length
0.41 in
Tooth Width
0.444 in
Bushing Bore Size [Max]
2.5 in
Weight
3.76 LB
EAN or UPC
697950031996
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