About Smiths

We are a world-class supplier of engineering raw materials. Our objective is to provide all our customers, from the small machine shop to the large multi-national corporation, a supply path that continuously delivers the highest levels of service, quality and value.

Type 303

Stainless Steel

303 Stainless Steel

Type 303 stainless steel is an alloy which is the most readily machinable austenitic stainless steel available today.


Superior machinability is due to the presence of sulphur in the material composition, although improved machinability is at a cost - the sulphur content results in a decrease in corrosion resistance and also a slight lowering in toughness. But as with most austenitic grades, the toughness is still excellent. Weldability of the alloy is poor. Type 303 finds use in a variety of engineering applications.


The material is an austenitic steel grade with better machinability but reduced formability. The material is not recommended for applications where welding is required. Type 303 has lower corrosion resistance when compared with 1.4301.

Typical Applications

Commercial applications for this engineering material include:

  • Aircraft fittings
  • Gears
  • Nuts and bolts
  • Electrical switchgear components
  • Bushings
  • Shafts

We stock Type 303 in flats, round bar, plate, sheet, wire, round tube, hollow bar, square bar and hexagon bar.

Technical Assistance

Our knowledgeable staff and resident metallurgists will be pleased to assist you further on any technical topic. Smiths Metal Centres Limited also boasts an in-house UKAS Accredited Testing Laboratory which is unique within the multi-metal and plastic stockholding sector. We believe this underlines our total commitment to quality and our ethos of being the complete service provider.

Additional Info

A technical datasheet for Type 303 is available in PDF file format. To view and download, please click here.

We offer in-house processing options - for more information, please refer to our processing services.

Read our corporate brochure by clicking here.

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