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Material Specification

AISI 321

AISI 321 Fasteners
Titanium-Stabilized Austenitic Stainless Steel

Austenitic Stainless Steel AISI 321 Fasteners

Buy AISI 321 bolts, studs, and nuts from Exotic Alloy, conforming to ASTM A193 B8T, ASTM A276, and ISO 3506.

Exotic Alloy fasteners offer AISI 321 bolts, nuts, and studs with standard and custom manufacturing to your exact project specifications. We cover AISI 321 hex bolts, heavy hex bolts, studs, stud bolts, hex nuts, washers, threaded rod, and custom drawing fasteners in metric (M3 to M120) and inch sizes (1/4" to 5") with coarse, fine, and extra-fine threads to ASME, ISO, and DIN standards.

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AISI 321 Bolting Products

AISI 321 Specifications & Standards

  • ASTM A193 / A194
  • ASTM A276 / A479
  • UNS S32100
  • ASTM F593 / F594
  • DIN EN ISO 10088-3 (1.4541 / X6CrNiTi18-10)
  • ISO 3506-1 / 3506-2
  • BS 970 / BS EN 10088
  • JIS G4303
AISI 321 Material Datasheet

AISI 321 Properties

Chemical Composition (AISI 321)
Elements C Mn P S Si Cr Ni Ti Fe
Min % - - - - - 17.00 9.00 0.40 Balance
Max % 0.08 2.00 0.045 0.030 1.00 19.00 12.00 0.70 Balance
Mechanical Properties (AISI 321)
Condition / Heat Treatment Tensile Strength (MPa) Yield Strength (MPa) Elongation (%) Hardness
Annealed (Soft) 550 - 650 220 - 290 40 - 55 % 150 - 180 HB / 80 - 88 HRB
Cold Drawn (Class 70) 700 450 25 % 190 - 220 HB / 90 - 95 HRB
Cold Drawn (Class 80) 800 600 15 - 20 % 240 - 280 HB / 22 - 29 HRC

AISI 321 Characteristics

  • Proven metallurgical corrosion resistance across chemical, atmospheric, and marine media
  • Superior ductility and high toughness from cryogenic depths (-196°C) to elevated temperatures
  • Standard austenitic Face-Centered Cubic (FCC) lattice ensuring non-magnetic characteristics
  • Excellent weldability and compatibility with standard industrial TIG/MIG welding techniques
  • Comprehensive compliance with global ASTM, ASME, DIN, ISO, and BS bolting specifications

AISI 321 Applications

  • High-integrity industrial bolting (hex bolts, heavy hex nuts, stud bolts, tie rods)
  • Chemical and petrochemical process piping, pressure vessels, and heat exchanger flanges
  • Food, beverage, brewery, and dairy processing sanitary machinery and conveyor systems
  • Architectural structural facades, marine railings, coastal cladding, and glass wall spider bolts
  • Cryogenic storage tanks, LNG transport valves, and pharmaceutical cleanroom equipment