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
Steel
Hub Dia.
4 1/4 in
O.D.
8.516 in
Bushing Type
Taper Lock
Outside Dia.
8.516 in
Overall Length
1 3/4 in
Inch/Metric
Inch
Width Across Teeth
1.75 in
Martin No.
80BTB25H
Bushing Series
2517
Bore Type
Bushed
Tooth Width
0.575 in
Pitch Diameter
7.979 in
Bore Size [Max]
2.875 in
Bushing Bore [Max]
2 1/2 in
Length Through Bore
1.75 in
No. of Strands Across
1
No. of Teeth
25
Hub Length
1.19 in
Material Internal Use
Carbon Steel
Chain Sprocket Number
80
Hub O.D.
4.25 in
Bushing Bore Size [Max]
2.875 in
Chain Sprocket Pitch
1 in
Overall Length Less Threads
N/A
Material External Use
Steel
Outside Dia. [Min]
8.5160 in
Caliper Diameter
7.338 in
Single Strand Tooth Thickness
0.575 in
Bushing Bore [Min]
1/2 in
Chain No.
80
Construction Internal
Welded
Type
B
Chain Pitch
1.000 in
Hub Projection
1.19 in
No. of Teeth Rows Strands
1
Hardened Teeth
With Hardened Teeth
Pitch Dia.
7.979 in
Sprocket Style
B
Weight
8.14 LB
EAN or UPC
697950043647
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