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.


Aerospace Steel Bar

S155 Aerospace Steel Bar

BS S155 in the British Standard Aerospace Series is a Nickel-Silicon–Chromium–Molybdenum–Vanadium through hardening steel with a tensile strength of 1,900-2,100 MPa.


The material is manufactured by consumable electrode vacuum arc remelting (VAR). Bars, and where practicable, forgings, are subjected to ultrasonic examination. Bars and forgings are supplied in the normalised and softened condition. Parts produced from bar and forgings are required to be supplied in the finally heat treated condition which consists of hardening followed by oil quenching and tempering followed by air cooling.

Aerospace & Motorsport

BS S155 aerospace steel bar is supplied in black bar for machining and in forgings. The alloy is normally subjected to ultrasonic inspection before supply. It is used widely in high technology applications such as aerospace and motorsport.

Typical Applications

Commercial applications for this engineering material include:

  • Aircraft engineering components
  • High performance components for Autosport

We stock S155 in flats, round bar and square 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 S155 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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