ID: 25.3 mm OD: 39.0 mm Thickness: 3.2 mm Steel type: EN 1.4404 (AISI 316L) or equivalent Threatment: Surface Hardened Surface coating: - Washer hardness: ≥ 520 HV0.5 Corrossion resistance: PREN 27** Bolt grades: Up to A4-80 Temperature range: -160°C to 500°C