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
Chain Sprocket Pitch
0.625 in
Bushing Bore Size [Max]
2 in
Chain Sprocket Number
50
Pitch Diameter
4.990 in
Hub Projection
0.21 in
Construction Internal
Solid
Hardened Teeth
With Hardened Teeth
No. of Teeth Rows Strands
2
Hub Length
0.21 in
Bushing Bore [Min]
0.5 in
No. of Strands Across
2
Bore Size [Max]
2 in
Bushing Series
2012
Width Across Teeth
1.045 in
Chain Pitch
0.625 in
Type
B
Length Through Bore
1.25 in
Bore Size [Min]
0.5 in
Outside Dia. [Min]
5.3220 in
Tooth Width
0.332 in
Martin No.
50BTB25H
Overall Length
1 1/4 in
O.D.
5.322 in
Material External Use
Steel
Bushing Bore [Max]
2 in
Hub O.D.
4.281 in
Material Internal Use
Carbon Steel
Inch/Metric
Inch
Single Strand Tooth Thickness
0.332 in
Bore Type
Bushed
Hub Dia.
4.2813 in
Overall Length Less Threads
N/A
No. of Teeth
25
Material
Steel
Caliper Diameter
4.58 in
Bushing Bore Size [Min]
0.5 in
Sprocket Style
B
Chain No.
50-2
Outside Dia.
5.322 in
Pitch Dia.
4.987 in
Bushing Type
Taper Lock
Weight
3.81 LB
EAN or UPC
697950031491
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