This 2205 duplex stainless steel hex flange bolt features an integrated flange under the hex head forged as one part, eliminating the need for separate flat washers. Duplex stainless steel consists of austenite and ferrite dual-phase microstructure, with much higher yield strength than conventional 304 and 316L stainless steel. It delivers outstanding resistance to chloride pitting, crevice corrosion and stress corrosion cracking. Precision rolled threads with full tooth profile ensure uniform stress distribution. The flange increases bearing area to spread clamping force and protect connected substrates, offering reliable anti-loosening performance under continuous vibration. Match with nuts of identical material to prevent galvanic corrosion.

Widely used in offshore wind power equipment, offshore platforms, heavy mining machinery, railway equipment, engineering machinery, pumps & valves, steel structure brackets and other harsh environments with heavy load, salt spray and persistent vibration.

1. Integrated flange design, built-in bearing surface, saves flat washers and simplifies assembly.
2. Enlarged contact area disperses pressure to avoid substrate crushing, excellent vibration resistance.
3. 2205 duplex steel provides high mechanical strength and good chloride corrosion resistance.
4. Forged blank with dense grain structure, great fatigue and impact resistance.
5. Sizes M18-M48 available, customizable length for engineering project orders.