Surface Finish


Reading Assignment

  • 35.1 Introduction to Surface Engineering

See also:

Metal Finishing Guidebook


Importance of Surface Condition

  • Friction
  • Fit
  • Aesthetic
  • Corrosion resistance
  • Fatigue strength

Surface Topography

ASME Y 14.36M – 1996

  • Roughness Rt and Ra – Finely spaced irregularities
  • Waviness – Greater spacing than roughness.
  • Lay – Direction of surface patterns
  • Cutoff – Sampling length used in the calculation of roughness.  If not specified, a value of .030 in. is assumed.

Typical Values of Roughness






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