Engineers Edge Surface Roughness Comparator Shop Set - microinch

  • Model: G-4


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The Engineers Edge Visual Tactile Surface Roughness comparator set contains four surface finish roughness comparator scales and provides specimens of a full range of roughness averages (Ra). They are made of corrosion resistant electroformed nickel that are duplicates of actual machined, grit-blasted, shot-blasted and electrical discharge machined (EDM) surfaces.

The Engineers Edge Surface Roughness Set is supplied in an attractive pocket-sized vinyl case. Individual scales are available and can be purchased separately.


  • Twenty two specimens of conventionally machined surfaces - lapped, ground, blanchard ground, shape-turned, milled and profiled - ranging from 2 to 500 microinches. (S-22)
  • Six shot-blast specimens ranging from 32 to 1000 microinches. (SH-6)
  • Nine EDM specimens ranging from 16 to 250 microinches. (E-9)
  • Six grit-blast specimens ranging from 32 to 1000 microinches. (G-6)
  • Supplied in a leatherette case with engineering data and instructions.
  • Also available in metric with micrometer designations.

The Surface Roughness Scale provides an economical tool which permits roughness to be specified on the same basis as linear measurements. The surfaces presented are the result of years of research and engineering. Details covering this subject are now published in The American National Standards Institute (ANSI) specification titled: "Surface Texture, Surface Roughness, Waviness and Lay". ANSI/ASME B46.1

Surface Roughness Scale is made by a dual electroforming process wherein nickel is electrodeposited to provide an exact reproduction in intricate detail. The surfaces used in this scale are reproductions of accurately turned surfaces measured in microinches (millionths of an inch-  0.000001"). The numbers engraved alongside each surface are the average deviation from the mean surface expressed in microinches.

Easy to use:

Place the Surface Roughness Microfinish Comparator Scale alongside your work piece. Slide the scale so that the rectangle with the surface roughness you want is adjacent to the piece you are examining. Compare by drawing the tip of the fingernail across each surface at right angles to the tool mark. The feel of the fingernail contact must be the same if the finishes are identical.

Individually serialized, calibrated and certified comparators are available from Engineers Edge at an additional charge. These prices are subject to change without notice. Contact Engineers Edge to determine current price and lead time - Contact Form

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This product was added to our catalog on Friday 24 September, 2021.

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