This set contains standards for the six most important maching methods in the prevalent "AA" values.
These Surface Roughness is used to compare and determine the degree of the surface finish by comparision method and eye estimation or magnifying glass.
The surface rough contrast blocks is made of 45 super carbor steel except the GCr 15 which is using to plat lapping the sample block.
All 30 speciments are calibrated in u" AA( ArithmeticalAverage)and in the metric equivalents um Ra.
Description
specifications
Quantity: 30pcs
Ra value: 0.05-12.5mm
usage:Compare and Determine the Degree of the Surface Finish