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