MATERIAL: - Nut: Alloy steel 30CD4 or 35CD4 in accordance with TR 3791, heat treated for 40-43 HRC.
- Washer: Alloy steel 25CD4 or 30CD4 in accordance with TR 3791, heat treated for 315-350HV/5.
SURFACE TREATMENT: - Nut: Cadmium plate in accordance with EN 2133 class B + Dry film lubricant in accordance with EN 2491.
- Washer: Cadmium plate in accordance with EN 2133 class B.
CLASSIFICATION: 1100 MPa (at room 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: SD in accordance with NFL 22036 on the area indicated on the drawing.
QUALIFICATION AND ACCEPTANCE CONDITIONS: NF L 22-500.
Contact Howmet for the diameter/type in manufacturing.