Surface finish Ra and Rz
Difference between the two parameters and when to specify each.
Ra is average; Rz is peak-to-valley. For bushing holes, Ra is enough; for seal seats, Rz is decisive.
Full article in production by the HannaTools R&D Team. This is the initial version published for indexing — updated continuously.
Topics covered
- Definition and context
- State of the art
- Technical criteria
- Application to Hanna HR®
- Measurable metrics
- Normative references