MATERIAL: - Nut : Alloy steel in accordance with TR3791, heat treated for 40-43 HRC.
- Washer : Alloy steel in accordance with TR3791 heat treated for 315-360HV.
SURFACE TREATMENT: Nut and washer: Cadmium plate 5µm mini + chromating in accordance with EN 2133.
LUBRICANT: Cetyl alcohol only on the nut.
CLASSIFICATION: 1100 MPa (at ambient temperature) / 235 °C.
THREAD: - PROFILE: ISO M in accordance with NFL 05220.
- TOLERANCES: in accordance with NFL 05224.
TOLERANCES OF FORM AND POSITION: In accordance with ISO 8788.
MARKING: In accordance with EN 2424 – category F, on the area indicated on the drawing.
QUALIFICATION AND ACCEPTANCE CONDITIONS: NFL 22500. Except self-locking torque restricted to 1 reusability cycle at ambient temperature with test bolts in TA6V, 1100Mpa, IVD + cetyl alcohol.
Contact Howmet for the diameter/type in manufacturing.