347 Stainless Fasteners

Nickel Systems will supply 347 Stainless hex bolts and hex nuts on a made to order basis.

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.


Primary Resistance



ASTM A193 B8C, ASME SA193 B8C (Bolts)
ASTM A194 8C, ASME SB194 8C (Nuts)
UNS S34700
W-Nr 1.4550

Typical Tensile Strength (at room temperature in KSI)


Typical Chemistry (% by weight)

C .06, Cb + Ta .5, Cr 18, Fe 69, Mn 1, Ni 11, P .03, S .01, Si .5

Technical Data Sheet
This technical data sheet discusses 321 Stainless, as well as 347 Stainless.