Duplex Bolting

Alloy Common Name Related Specifications
    European UNS ASTM/ASME
Alloy 2205 SAF 2205 ® 1.4462 S32205 F60
31803 31803 1.4462 S31803 F51

SSF produces duplex fasteners in all grades of duplex, to customer specification. Duplex grades are a mixed microstructure of Austenite and Ferrite, combining the properties of both (hence the name DUPLEX). Duplex stainless steels have high corrosion resistance as well as a high strength. Mechanical properties are around double that of a typical austenitic grade such as 316. They would also normally offer higher stress cracking resistance in Chloride solutions for example. They are composed typically of 22% Chromium, 5 % nickel. Having worked with duplex since its outset, the duplex bolting continues to account for a core part of our business, along with Super duplex.

Other material groups:

Super Duplex
High Nickel Alloys
Stainless Steel and others

Types of Fastener in Duplex

  • Hexagon Bolts and Set Screws
  • Studbolts
  • Nuts
  • Socket Cap Screws
  • Engineer Studs
  • Socket Countersunk Screws
  • Socket Setscrews
  • Hexagon Nyloc Nuts
  • Washers
  • Machined Parts