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