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Material Specification

AISI 303

AISI 303 Fasteners
Free-Machining Austenitic Stainless Steel

Austenitic Stainless Steel AISI 303 Fasteners

Buy AISI 303 bolts, nuts, precision CNC turned studs, standoff fasteners, and custom spacers from Exotic Alloy, conforming to ASTM A582, ASTM A276, and DIN EN ISO 10088-3. Specifically alloyed with sulfur (0.15% to 0.35%), AISI 303 is the premier free-machining austenitic stainless steel, providing unmatched chip-breaking properties and high cutting speeds.

Exotic Alloy delivers high-precision turned AISI 303 fasteners, bushings, valve trim, dowel pins, and threaded spacers. Engineered with precision CNC turning centers, our AISI 303 fasteners deliver mirror-like surface finishes and tight dimensional tolerances.

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AISI 303 Bolting Products

AISI 303 Specifications & Standards

  • ASTM A582 / A582M (Free-Machining)
  • ASTM A276 / A479
  • UNS S30300
  • SAE 30303
  • DIN EN ISO 10088-3 (1.4305)
  • JIS G4303 (SUS303)
  • BS 970 303S31
  • ISO 3506-1
AISI 303 Material Datasheet

AISI 303 Properties

Chemical Composition (AISI 303)
Elements C Mn P S Si Cr Ni Mo Fe
Min % - - - 0.15 - 17.00 8.00 - Balance
Max % 0.10 2.00 0.045 0.35 1.00 19.00 10.00 0.60 Balance
Mechanical Properties (AISI 303)
Condition / Heat Treatment Tensile Strength (MPa) Yield Strength (MPa) Elongation (%) Hardness
Annealed 600 240 45 % 160 HB / 84 HRB
Cold Drawn (Turned) 700 450 25 % 205 HB / 94 HRB

AISI 303 Characteristics

  • Supreme machinability rating (~75% of B1112 screw stock) with rapid chip breaking
  • Reduces machining cycle times and tool wear in multi-spindle automatic screw machines
  • Good resistance to mild atmospheric, food, and organic chemical exposure
  • Excellent non-magnetic stability in the annealed condition
  • Flawless surface finish after high-speed CNC turning and thread chasing

AISI 303 Applications

  • Precision CNC turned bolts, custom nuts, threaded standoffs, and bushings
  • Gears, pinions, shaft fittings, and electrical connector shells
  • Aircraft mechanical linkage bolts, instrument studs, and hydraulic valve trim
  • Pharmaceutical dispensing nozzles, pump shafts, and conveyor pins
  • Architectural hardware, decorative turnbuckles, and marine interior fasteners