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16009 Surface Grinding Comparator

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Individually Serialized, Calibrated & Certified Microfinish Comparators come with a Certificate of Calibration.

Measuring Conditions are listed with their corresponding values.

The calibrating system was calibrated to Standard Reference Material traceable to the National Institute of Standards and Technology. Calibrations are performed by Holts Precision inc.



The largest variety of standards available for assessing and specifying, by symbol, the degree of roughness of machined parts - including every machining method known.

Every Obtainable Value

  • 15 different sets available 
  • Each value size is 16mm x 25mm (or 5/8" x 1")
  • Overall dimensions of each plate 52mm x 128mm (or 2 1/16" x 5")
  • Light in weight - can be carried in pocket. Supplied in a plastic wallet.

Flexbar's Surface Roughness (texture) comparison standards. Made of solid electroformed nickel.   

  • Machining Method: surface grinding
  • No. of Specimens: 8
  • Range Ra µm: .025-3.2
  • Range AA µ": 1,2,4,8,16,32,63,125
  • N Numbers: 1-8

Surface Roughness (texture) comparison standards. Made of solid electroformed nickel.

The specimens are electroformed replicas of original edm'ed surfaces.

This MICROFINISH COMPARATOR Surface Roughness Scale is made of nickel. It will not corrode.

Each specimen has the surface roughness characteristics of a turned metallic material.

Means the finely spaced surface irregularities produced by the cutting action of the tool edges, the feed of the machine tool and by abrasive grains.

The original masters and the electroformed replica production masters have been checked at evenly distributed intervals. Sufficient measurements were taken to determine a representative average. The rating listed is the average of these readings.

This is the term to designate the direction of predominant surface irregularities.

These are the irregularities which may appear at frequent intervals. They are not typical of a turned surface.

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