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.

Processing Services

4340M Steel Bar

Low alloy steel.


4340M is a low alloy steel that combines high strength with good toughness and fatigue strength.

4340M steel bars include chromium, molybdenum and nickel in the alloying process and offer increased strength and toughness.


4340M is a low alloy steel that combines high strength with good toughness and fatigue strength. 4340M include vanadium and a higher silicon content to produce even higher strength levels when compared to 4330M. With high transverse ductility, toughness, and creep characteristics, the alloy is ideal for applications where strength and fatigue resistance are primary considerations, along with impact strength and fracture toughness.


Aircraft Grade Material

The alloy is often referred to as an aircraft-quality steel and finds extensive use in aerospace applications, including airframes, bolts, fasteners and landing gear. 4340M offers good ductility and is classed as a through hardening alloy.



4340M Steel Bar Datasheet

Unrivalled Support

We have access to our Group's UKAS Accredited Testing Laboratory, where our team of metallurgists offer unrivalled product support. We also provide a broad range of testing services, including Charpy, tensile and chemical analysis.



Stock Availability

Smiths Advanced Metals stocks 4340M steel bars in the normalised and tempered condition. Our steel bars are stocked in closer incremental sizes, which often removes the need for extra machining.



Product Features:


    AMS6257
    AMS6417
    AMS6419
    BMS 7-26 (Boeing)
    BS S100
    BS S155
    C-05-1190 (Lockheed)
    MIL-S-83135
    MIL-S-8844
    MTL1202 (Safran)
    UNS K44220
    ZFNL 9207

    Airframes
    Fasteners
    Landing Gear
    Bolts

    Excellent transverse properties
    Good fatigue resistance
    Very high strength
    Good ductility

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