ASTM A479/A479M Duplex Super Duplex Steel Stud Bolts Nuts Washers UNS S31803 S32750 Fasteners

We supply high-quality Duplex and Super Duplex stainless steel fasteners manufactured in compliance with American (ANSI/ASME) standards, including stud bolts, heavy hex nuts, and washers. All products are manufactured from premium raw materials certified to ASTM A479 / ASME SA479 specifications, delivering exceptional mechanical properties and superior corrosion resistance for demanding industrial applications

Duplex S31803 (UNS S31803 / 2205) - 22% Cr, 5% Ni, 3% Mo - Offers approximately twice the yield strength of standard austenitic stainless steels (316/304), with excellent resistance to stress corrosion cracking, pitting, and crevice corrosion. PREN value > 34.

Super Duplex S32750 (UNS S32750 / 2507) - 25% Cr, 7% Ni, 4% Mo - Premium grade with higher chromium and molybdenum content, providing superior strength and corrosion resistance for the most aggressive environments. Minimum tensile strength: 116 ksi [800 MPa], minimum yield strength: 80 ksi [550 MPa]. PREN value > 40

• Stud Bolts: Full-threaded and double-end studs (ASME B18.2.1), available in various diameters and lengths
• Heavy Hex Nuts: ASME B18.2.2 heavy hex nuts, standard and jam nuts
• Washers: ASME B18.22.1 flat washers, plain finish
• Other types: Threaded rods, socket head cap screws, anchor bolts available upon request

• Unified Coarse (UNC)
• Unified Fine (UNF)
• 8UN Series (for high strength bolting applications)