Surface Roughness Standards: ISO 25178 vs. JIS B 0601-2001
The chart below summarizes the differences between ISO 25178 and JIS B 0601-2001/JIS B 0671-2002.
| Item / Standard | ISO 25178 | JIS B 0601-2001 (ISO 13565-1) |
||
|---|---|---|---|---|
| Instruments | contact-type and non-contact type measuring instruments | contact-type (stylus method only) |
||
| Cross-section | Evaluation target | S-F surface | Cross-sectional profile | |
| Filter | S-filter | λs filter | ||
| Roughness | Evaluation target | S-L surface | Roughness profile | |
| Filter | S-filter, L-filter | λs filter, λc filter | ||
| Height parameters | Maximum peak height | Sp | Rp | |
| Maximum pit height | Sv | Rv | ||
| Maximum height | Sz | Rz | ||
| Arithmetical mean height | Sa | Ra | ||
| Root mean square height | Sq | Rq | ||
| Skewness | Ssk | Rsk | ||
| Kurtosis | Sku | Rku | ||
| Spatial parameters | Sal, Str, Std | – | ||
| Hybrid parameters | Sdq, Sdr | RΔq | ||
| Item / Standard | ISO 25178 | JIS B 0671-2002 (ISO 13565-1998) |
||
|---|---|---|---|---|
| Roughness | Function parameters | Level difference on core surface | Sk | Rk |
| Reduced peak height | Spk | Rpk | ||
| Reduced valley depth | Svk | Rvk | ||
| Peak material portion | Smr1 | Mr1 | ||
| Valley material portion | Smr2 | Mr2 | ||
[Caution] The above chart is created based on the definitions of Surface Texture parameters specified in ISO 25178-2:2012. Please note that the above information may be changed via standard revisions after April 2012.
