347 Stainless Steel

UNS S34700

347 Stainless fasteners are used in corrosive environments where temperatures may cycle to over 800º F (425º C). Oil refinery applications are common. Other uses for 347 Stainless are in heat sensors and thermocouples.

321 Stainless (UNS S32100/ASTM A193 B8T) is a very close relative. While 347 Stainless is stabilized by the addition of columbium and tantalum to resist intergranular corrosion, 321 is stabilized by the addition of titanium.

347 Stainless Fasteners

  • Lock Nuts
  • Set Screws
  • Dowel Pins
  • Pipe Plugs
  • Vented Screws
  • 12-Pt Flange Screws
  • Custom Fasteners


  • Bolts: ASTM A193, ASME SA193 B8C
  • Nuts: ASTM A194 8C, ASME SB 194 8C

Material Properties

Material Properties: 347 Stainless

Technical Data Sheet

Technical Data Sheet

Industries & Applications

  • Oil & Gas

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