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The measurement of surface roughness is not as straight forward as most other engineering measurements. In order to get good accuracy, expensive instruments are often required. This Surface Roughness Comparison Specimens set offers an inexpensive and simple solution for workshop use, allowing for convenient visual and tactile comparison.
Standardization: ISO2632/-1975
This set contains standards for the six most important machine methods in prevalent "AA" values. Made of 45 super carbon steel (except GCr15 for lapping blocks), all 30 specimens are calibrated in μ"AA" and metric Ra equivalents.
| Turning | Vertical Milling | Plain Grinding | |||
|---|---|---|---|---|---|
| um | uin | um | uin | um | uin |
| 12.5 | 500 | 12.5 | 500 | 1.6 | 63 |
| 6.3 | 250 | 6.3 | 250 | 0.8 | 32 |
| 3.2 | 125 | 3.2 | 125 | 0.4 | 16 |
| 1.6 | 63 | 1.6 | 63 | 0.2 | 8 |






Sandstorm Steel