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