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    +44(0)1767 604555
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    +44(0)7710 107987
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We are specialists in engineering materials support to improve the aerospace MRO supply chain.

Smiths MRO is a sub-divsion of a larger business - Smiths Advanced Metals.

Smiths MRO focuses on raw material support for the global aircraft maintenance, repair and overhaul market. Our business is supported by a broad and diverse stock range with a dedicated team that provides outstanding service levels required for our industry.

We offer our customers total traceability with a unique barcoding system.

4330 Bar (AMS 6411)

Aerospace Steel Bar

4330 aircraft steel bars to AMS6411.

We stock 4330 (AMS 6411) premium aircraft steel bars - an engineering alloy steel modified with the inclusion of vanadium.

4330 alloy steel bar features the inclusion of vanadium in the alloying process resulting in a product benefitting from good impact strength and hardness. Another feature is high strength since the alloy responds well to heat treatment. Excellent fatigue strength and high tensile strength result in an alloy suitable for the most demanding aerospace applications, including MRO.

Other Characteristics

The reduced carbon content of the alloy (when compared to 4340 steel) makes the product particularly useful in applications where fatigue loading and stress concentration are a consideration. Other beneficial features include improved notch toughness and resistance to crack propagation. Typical applications include bolts, shafts, undercarriage components and airframes.


4330 steel is manufactured according to AMS 6411 by vacuum arc remelting (VAR) method and can undergo a secondary melt via ESR (Electro Slag Remelt) if specified by the customer.

MRO Sector Support

We stock 4330 aerospace-grade steel bars to support the aircraft MRO sector. We stock our products in closer incremental sizes, which means you will receive materials closer to your finished size requirements. We also supply bars to standard or cut lengths.

Our dedicated export team a fully qualified to handle the shipping of your goods, with rapid despatch times to locations on a global basis. Often, we are able to arrange shipping of stocked materials on the same day.

Product Features:

    AMS 6411


    High strength
    Excellent fatigue strength
    Improved notch toughness
    Excellent hardenability

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4330 Steel Bar?

Smiths MRO

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