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.

17 4PH (AMS 5643, UNS S17400)

Precipitation Hardening Stainless Steel

17 4PH Precipitation Hardening Stainless Steel

An American aerospace grade stainless steel that contains 4% copper and may be hardened by a single low-temperature precipitation hardening heat treatment, producing excellent mechanical properties at a high strength level,


This grade of stainless steel has a typical density of 7.75kg/dmĀ³ and can be magnetised. 17 4PH finds specific use in applications where a combination of unusually high strength and moderate corrosion resistance is a determining factor. The alloy has similar corrosion resistance characteristics when compared to 304 stainless steel.

Typical Applications

Commercial applications for this engineering material include:

  • Motor shafts
  • Valve stems
  • Gears
  • Intricate machined parts

We stock 17 4PH in flats, round bar and hollow 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 17 4PH 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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