| Usual description AFNOR symbol |
Magnetic permeability | Electrical or thermal conductivity |
Field of use |
Supply |
| Carbon steel C75S / CK75 |
Very Good |
Low | Waved spring washers, diaphragm sping washers, OndufilTM, spring rings, in a sealed, well lubricated housing | Always in stock |
| Chromium-molybdenum steel 51CrV4 |
Very Good | Low | These steels are selected if high carbon steels are unsuitable due to fatigue resistance or special heat treatment requierements. |
Regular |
| Lightly alloyed steel 45Si Cr Mo 6 |
Very Good | Low | Thick Belleville washers requiring high internal stress ratios |
Regular |
| X10 Cr Ni 18-8 |
Low due to work hardening |
Low | Waved spring washers, Belleville washers, diaphragm spring washers, OndufilTM, sping rings, located in a non-waterproof housing and subject to even lightly corrosive substances. | Always in stock |
| X5 Cr Ni 18-10 |
Low due to work hardening |
Low | OndufilTM spring washers requiring low elasticity and good corrosion resistance. | Difficult |
| X6 CrNi MoTi 17-12-2 |
Low due to work hardening |
Low | OndufilTM spring washers in particularly corrosive environments. | Regular |
| Structuraly hardened stainless steel - 17-7 - Ph X7 Cr Ni Al 17-7 |
Good | Low | Waved spring washers, OndufilTM in corrosive environments, high temperatures. | Difficult |
| Martensitic stainless steel - 17-4 - Ph X5 Cr Ni Cu Nb 16-4 |
Zero |
Low | Large Belleville washers in corrosive environments. | Difficult |
| Inconel X 750 super alloy Ni Cr15 Fe7 Ti Al |
Zero | Low | Waved spring washers, Belleville, diaphragm spring washers, OndufilTM, high temperature parts. |
Very difficult |
| Inconel 718 super alloy Ni Cr19 Fe19 Nb5 Mo3 |
Zero | Low | Waved spring washers, Belleville, diaphragm spring washers, OndufilTM, spring rings for nuclear, aeronautical, space, very high temperature. |
Always in stock |
| NIMONIC 90 super alloy Ni Cr20 Ti Al |
Zero | Low | Belleville washers only for high-temperature nuts and bolts, gas turbines, aeronautical. |
Very difficult |
| Beryllium copper Cube 2 |
Zero | Very high |
Waved spring washers, Belleville, diaphragm spring washers, OndufilTM, spring rings. Cryogenic media. |
Always in stock |
