Recommendations for the dynamic sealing surface on piston rods
(induction hardened and chrome plated rods)
| Thermoplastics
and rubbers |
PTFE
materials |
|
| Ra | 0,05 to 0,3 µm
(2 to 12 µin.) |
0,05 to 0,2 µm
(2 to 8 µin.) |
| Rz | 0,4 to 2,5 µm
(15 to 100 µin.) |
0,4 to 2 µm
(15 to 80 µin.) |
| Rmax | 0,4 to 2,5 μm (15 to 100 μin.) | |
| Rmr | 50 to 95%
(cutting depth 0,5 Rz based on cref = 0%) |
|
| Hardness | ≥ 50 HRC | |
| Hardening
depth |
~1,2 to 2,5 mm (~0.05 to 0.1 in.) | |
| Chromium
layer thickness |
~20 to 30 μm (~0.0008 to 0.001 in.) | |
