303 Stainless Steel Plate - ASTM A 895 - For Cutting and Machining

303 is austenitic free-machining stainless steel which is used primarily for parts requiring machining, grinding or polishing.  This alloy offers good corrosion resistance in mild environments and good forming properties.  It is non-magnetic in the annealed condition and can only be hardened by cold working.  

303 Inventory Size Ranges


0.1875" - 4.000"

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Standard Inventory Specifications

  • UNS S30300
  • AMS 5640 Chem Only
  • ASTM A 895

Common Trade Names

  • AISI 304

Common Applications of 303

  • Aircraft applications including fittings, shafts and spindles
  • Automatic screw machine applications
  • Medical devices with screw threads, drilled or tapped holes
  • Pump and valve parts
  • Architectural applications
  • Nuts and bolts
Chemical Composition of 303 Stainless Steel
Element Percent by Weight
Cr Chromium 17.0 min - 19.0 max
Ni Nickel 8.0 min - 10.0 max
C Carbon 0.15 min
Mn Manganese 2.00 min
P Phosphorus 0.20 max
S Sulfur 0.15 min - 0.35 max
Si Silicon 1.00 max
Mo Molybendum 0.60 max

Physical Properties of 303 Stainless Steel


Density lb/in?


Density g/cm?


Melting Point


Thermal Conductivity at 212°F (100°C)

112 BTU/hr/ft²/ft/°F

Thermal Conductivity at 212°F (100°C)

16.2 W/m-°K

Electrical Resistivity

28.3 Microhm-in at 68°C

Electrical Resistivity

72.0 Microhm-cm at 20°C

Mechanical Properties of 303 Stainless Steel



(max) 202 (HBN)

The technical data provided is for information only and not for design purposes. It is not warranted or guaranteed.