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Service Factors Roller Chain Drive Table

ANSI Hardware Design Guide and Reference

Roller Chain Drive Service Factors Table

Service factors given below are for normal chain loading.

The horsepower ratings for multiple-strand chains equal single-strand ratings multiplied by these factors:

  • 2 strands, factor of 1.7,
  • 3 strands, 2.5,
  • 4 strands, 3.3.
Type of
Driven
Load
Type of Input Power
Internal Combustion Engine
With Hydraulic Drive
Electric Motor
Turbine

Internal Combustion Engine
With Mechanical Drive

Smooth
1.0
1.0
1.2
Moderate Shock
1.2
1.3
1.4
Heavy Shock
1.4
1.5

1.7