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Calibrated Metal Surface Roughness Standard with Certificate

Surface Roughness Standard

Surface Roughness Standard
Surface Roughness Standard
Stock #56-959
Qty 1+
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Regulatory Compliance


Product Family Description

  • Conforms to S.A.E. and Military Specifications
  • Manufactured to ANSI-B-46.1-1985
  • A Composite Set of 30 Standards

Our set of surface roughness standards contains 30 samples of 7/8" x 3/8" electroformed solid nickel plates for quickly evaluating the surface finish for six of the most common machining methods. Markings for each of the lapping, reaming, grinding, milling, and turning standards are in AA (micro-inches) and the metric equivalent, Ra (micrometers). Each surface type is consistently reproduced from masters and is accurate within ±10% of the nominal value. An ideal tool for quality assurance labs, engineering departments, drafting rooms, and machine shops, the standard gives the designer or operator a realistic idea of the feel, appearance, and texture of machined components. Instructions and CLA/Ra/AA correlation graph are included. The standard is packaged in a handy 6" x 3" wallet carrying case. Calibrated unit includes long-form NIST traceable calibration report.

Technical Information

Surface Finish Type # Samples Marking Sizes (AA values)
Flat Lapping 3 2, 4, 8μin
Reaming 3 16, 32, 63μin
Grinding 6 2, 4, 8, 16, 32, 63μin
Horizontal Milling 6 16, 32, 63, 125, 250, 500μin
Vertical Milling 6 16, 32, 63, 125, 250, 500μin
Turning 6 16, 32, 63, 125, 250, 500μin