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