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
No. of Strands Across
1
Chain Pitch
1.250 in
Material
Steel
Material External Use
Steel
No. of Teeth
21
Overall Length
1 3/4 in
Pitch Diameter
8.387 in
Bushing Type
Taper Lock
Tooth Width
0.692 in
Bushing Bore [Min]
1/2 in
Caliper Diameter
7.6134 in
Bushing Bore Size [Max]
3.063 in
Outside Dia. [Min]
9.0430 in
Hub Dia.
4 1/2 in
No. of Teeth Rows Strands
1
Chain Sprocket Pitch
1.25 in
Hub Length
1.06 in
Chain No.
100
Bore Type
Bushed
Hub Projection
1.06 in
Overall Length Less Threads
N/A
Pitch Dia.
8.387 in
Single Strand Tooth Thickness
0.692 in
Bushing Bore [Max]
2 1/2 in
Construction Internal
Welded
Outside Dia.
9.043 in
Width Across Teeth
1.75 in
Type
B
Martin No.
100BTB21H
Length Through Bore
1.75 in
Material Internal Use
Carbon Steel
Chain Sprocket Number
100
Bushing Series
2517
Hub O.D.
4.5 in
Inch/Metric
Inch
Bore Size [Max]
3.063 in
Hardened Teeth
With Hardened Teeth
O.D.
9.043 in
Sprocket Style
B
Weight
10.69 LB
EAN or UPC
697950043777
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