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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 Stainless Steel
    303 Stainless Steel

303 Plate

Standard Inventory Specifications

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

Inventory Size Range

  • Plate : 0.1875" - 4.000"

Please contact us for more details.

303 vs. 304

303 and 304 have similar chemistry and both are iron alloys, however Alloy 303 was purposefully developed for ease of machining. The additional sulfur present in 303 assists in breaking up turnings which reduces drag on the cutting tool and increases machining speeds.  AISI 303 is not weldable and has limited formability due to its sulfer content.  AISI 304 is weldable and machinable.  It has very good drawability as well.  Its low yield strength and high elongation allow it to be formed into complex shapes.  

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

Chemical Composition of 303 Stainless Steel

Element Percent By Weight
Type 303 stainless
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

Common Applications of 303 Stainless Steel Plate include:

  • 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

Physical Properties of 303 Stainless Steel


Density lb/inᶟ


Density g/cmᶟ


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)

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