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
Outside Dia.
7.235 in
Material
Steel
Overall Length
1 3/4 in
Type
B
Inch/Metric
Inch
Chain Pitch
1.000 in
Chain Sprocket Pitch
1 in
Overall Length Less Threads
N/A
Hub O.D.
4.25 in
Tooth Width
0.575 in
Construction Internal
Welded
Hardened Teeth
With Hardened Teeth
Material Internal Use
Carbon Steel
Bore Size [Max]
2.875 in
No. of Teeth Rows Strands
1
No. of Teeth
21
Width Across Teeth
1.75 in
Chain No.
80
Single Strand Tooth Thickness
0.575 in
Bushing Bore Size [Max]
2.875 in
Material External Use
Steel
No. of Strands Across
1
Chain Sprocket Number
80
Hub Projection
1.19 in
Bushing Bore [Max]
2 1/2 in
Martin No.
80BTB21H
Bushing Bore [Min]
1/2 in
Caliper Diameter
6.0657 in
Pitch Diameter
6.710 in
Pitch Dia.
6.71 in
Bushing Series
2517
O.D.
7.235 in
Hub Length
1.19 in
Outside Dia. [Min]
7.2350 in
Bushing Type
Taper Lock
Bore Type
Bushed
Hub Dia.
4 1/4 in
Length Through Bore
1.75 in
Sprocket Style
B
Weight
5.8 LB
EAN or UPC
697950043609
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