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
Material External Use
Steel
Hardened Teeth
With Hardened Teeth
Type
B
Width Across Teeth
1.71 in
Length Through Bore
2 in
Hub Length
0.3 in
Pitch Dia.
7.979 in
Chain Sprocket Pitch
1 in
No. of Strands Across
2
Overall Length Less Threads
N/A
Bushing Bore [Max]
3 in
Outside Dia. [Min]
8.5160 in
Bore Size [Min]
0.938 in
Inch/Metric
Inch
Hub Dia.
6 7/8 in
Bushing Bore [Min]
0.938 in
Overall Length
3 in
Chain No.
80-2
Construction Internal
Solid
Caliper Diameter
7.34 in
Single Strand Tooth Thickness
0.557 in
Material
Steel
Pitch Diameter
7.980 in
Bore Size [Max]
3 in
Bore Type
Bushed
Sprocket Style
B
O.D.
8.516 in
Outside Dia.
8.516 in
Bushing Bore Size [Max]
3 in
Hub Projection
0.3 in
No. of Teeth
25
Chain Pitch
1.000 in
No. of Teeth Rows Strands
2
Hub O.D.
6.875 in
Tooth Width
0.557 in
Material Internal Use
Carbon Steel
Bushing Type
Taper Lock
Chain Sprocket Number
80
Martin No.
80BTB25H
Bushing Series
3020
Bushing Bore Size [Min]
0.938 in
Weight
16.54 LB
EAN or UPC
697950032481
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