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