About Smiths Advanced

We are a leading stockholder and global supplier of metals and plastics into Aerospace & Space, Chemical, Defence, Medical, MRO, Naval, Nuclear, Oil & Gas and Power industries.

We make high quality materials available in a fast, cost-effective and convenient package and provide a consistent supply path for all our customers.

Finishing Options

BS S156 Steel Bar

Offering wear resistance after heat-treatment.


BS S156 is a high strength aerospace steel grade that offers hard wear resistance after surface treatment.

BS S156 steel bars are wear-resistant with high strength and classed as case hardening steel.


BS S156 is a high strength aerospace steel grade that offers hard wear resistance after surface treatment. The strength of the alloy is 1,320 - 1,520 MPa and is manufactured by the process of VAR (vacuum arc remelting), which is a typical process for speciality steel grades). Both bars and forgings should be ultrasonically tested if possible and receive final heat treatment, which entails carburising, hardening and tempering.


Surface Hardness

The surface hardness of the alloy, after receiving carburising, quenching, sub-zero treatment and tempering processes, will be around 730HV. The resulting product finds use in applications such as highly stressed aircraft parts, motorsport components and helicopter gears.



BS S156 Steel Bar Datasheet

Stock Availability

We stock BS S156 steel bars in a wide range ofincremental sizes and conditions (including normalised and softened conditions).



Product Features:


    1.6722
    16NCD17
    BS S100
    BS S82
    MSRR 6010

    High stressed aerospace parts
    Motorsport components
    Helicopter gears
    High performance components

    High strength
    Good mechanical properties
    Good hardenability
    Hard wearing after surface treatment

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