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 External Use
Steel
Inch/Metric
Inch
Hub Recess Depth
0.13 in
Width Across Teeth
0.875 in
Sprocket Style
B
Overall Length Less Threads
N/A
Chain Sprocket Pitch
0.625 in
No. of Strands Across
1
Outside Dia.
2.708 in
Chain No.
50
Length Through Bore
0.875 in
Hub Length
0.55 in
Hub Recessed
1
Hardened Teeth
With Hardened Teeth
Tooth Width
0.343 in
Caliper Diameter
2.0148 in
Chain Pitch
0.625 in
Bore Size [Min]
0.5 in
Pitch Dia.
2.415 in
Type
B
Material Internal Use
Carbon Steel
Bore Type
Bushed
Pitch Diameter
2.415 in
Bushing Series
1008
Bushing Type
Taper Lock
Construction Internal
Solid With Recess Groove
Overall Length
7/8 in
Hub OD @ Recess
1.67 in
Single Strand Tooth Thickness
0.343 in
Outside Dia. [Min]
2.7080 in
Hub Projection
0.55 in
Bushing Bore Size [Min]
0.5 in
Bushing Bore [Min]
0.5 in
Martin No.
50BTB12H
Hub Recess Width
0.22 in
Chain Sprocket Number
50
O.D.
2.708 in
Bushing Bore Size [Max]
1 in
Hub O.D.
1.938 in
Bushing Bore [Max]
1 in
Material
Steel
Bore Size [Max]
1 in
No. of Teeth Rows Strands
1
Hub Dia.
1 15/16 in
No. of Teeth
12
Weight
0.44 LB
EAN or UPC
697950043142
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