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
Inch/Metric
Inch
Length Through Bore
1.25 in
Chain Sprocket Pitch
0.75 in
Type
B
Hardened Teeth
With Hardened Teeth
Hub Length
0.81 in
Bushing Bore Size [Max]
2.75 in
Material External Use
Steel
No. of Teeth Rows Strands
1
Pitch Dia.
5.032 in
Chain Pitch
0.750 in
Hub O.D.
3.563 in
Width Across Teeth
1.25 in
Hub Projection
0.81 in
No. of Strands Across
1
Overall Length Less Threads
N/A
Bushing Bore [Min]
1/2 in
Outside Dia.
5.426 in
Material Internal Use
Atomized Metals
Bushing Type
Taper Lock
Bore Type
Bushed
Construction Internal
Solid
O.D.
5.426 in
Material
Steel
Overall Length
1 1/4 in
Hub Dia.
3 9/16 in
Caliper Diameter
4.549 in
Tooth Width
0.444 in
Martin No.
60BTB21H
Chain Sprocket Number
60
Bushing Series
2012
Outside Dia. [Min]
5.4260 in
Single Strand Tooth Thickness
0.444 in
Sprocket Style
B
No. of Teeth
21
Pitch Diameter
5.032 in
Bushing Bore [Max]
2 in
Chain No.
60
Bore Size [Max]
2.75 in
Weight
1.34 LB
EAN or UPC
697950043418
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