Selection of Roller Chain
It is important to select the most suitable roller chains and sprockets for the job by careful
study of power transmission requirements. The following basic factors should be considered when selectingroller chains for transmission needs through there may be other factors.

BS Single Pitch

ATMOSPHERIC CONSIDERATION
The input power ratings appearing on the pages of 93 to 107, have been worked out under the following
conditions.
1) To be driven in normal
atmosphereof -10°F to60°C free from ill effect ofabrasive dust, corrosive
gas, high humidity etc.

2) Sprockets should bealigned and mounted
on parallel horizontal
shafts.

3) Recommended
method of lubrication
and recommended
kind of lubricant should
be used.

4) Should be driven ateven load or small loadvariations.

ANSI Single Pitch

Power rating of multiple strand chain is not simply calculable by multiplying the power rating of one strand by the number of strand because of
uneven load distribution onto each strand. So, multiple strand factor should be used for expected service life.
A service life of 15,000 hrs, can be expected when chain length is 100 pitches and the above conditions are met.

POINT IN SELECTION ROLLER CHAIN AND SPROCKETANSI Double Pitch

The following factors must be taken into consideration in selecting proper chain drive, depending on chain
speed-normal or low speed. Also correction factors should be used, fully grasping the conditions of use.
a) Driven machineb) Type of load: smooth
light or heavy shockc) Source of powerd) kW to be transmitted[kW0:kW]e) RPM and diameter ofhigh speed shaft[n1:rpm]f) RPM and diameter oflow speed shaft[n2:rpm]g) Center distance ofshaft [m]h) Chain-driving speed[S:m/min]ENGI. 81X

SELECTION PROCEDURE ACCORDING TO CHAIN SPEEDIN CASE OF NORMAL SPEED
S=50~250m/min

Technical Information

To obtain corrected
power kW1 multiply
kW0 by correctedfactor f1 applied
according tocondition of use

To obtain chain andDetermine low speed
See if each sprocket
Make special
high-speed sprocket
sprocket teeth N2
shaft diameter andsprocket
teeth N1 use roller
from speed ratio R
mounting spacechain quick selection
satisfy specifications
N1chart and powerof machiObtain corrected
rating chart according
power kW1 of
R=n1/n2
to RPM of high speed
N2=R･N1*Check single strand by
kW1=kW0・f1
shaft and correctedreferring to multiple=kW0・f1・f2
power kW1
strand factor f2

OKFinally
determined

Economical sprockets for general industrial use are recommended except when special sprockets are made due to unavoidable
circumstances.

IN CASE OF LOW SPEED
S=Less than 50m/min.
Divided into two cases depending on chain driving conditions.
1) For low speed drive with few stops and starts, make the chain selection in a way to satisfy the following formula: T×f1×f3≦Max.
allowable chain load.
2) For low speed drive with frequent stops and starts. T×f1×f3×f4≦Ave. ultimate strength. Select the chain by substituting the valuesof chain speed and max working load into formulas (1)&(2), after chain selected tentatively in the general way.
N1[-]=Number of teeth on small sprocket.
N2[-]=Number of teeth on large sprocket.
P [mm]=Chain pitch

92 Sugiyama Chain

S [m/min]=Chain speed=N1･P･n1/1000
T [kN]=Max. working load.
=60×kW0/S