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