Smiths Local Branch Finder

You are here: → HomeMaterialsStainless SteelsAerospace Alloy & Stainless Steel Tube4140

4140 (AMS6349) Low Aloy Steel Tube4140 (AMS6349)

Low Alloy Steel Tube

Alloy 4140 (AMS6349) is a low alloy steel containing Chromium and Molybdenum.

Usually supplied hardened and tempered to condition with a tensile strength of 850 – 1000 MPa. The alloy offers a very good balance between strength, toughness and wear resistance. The alloy's chromium content provides good hardness penetration and the molybdenum imparts uniformity of hardness and high strength. 4140 responds well to heat-treatment and is comparatively easily machined in the heat-treated condition.

The material offers a combination of many desirable properties including good strength and wear resistance, excellent toughness, with good ductility and the ability to resist stress at elevated temperatures.

Key Features:

4140 (AMS6349) offers a wide range of benefits. The alloy has good strength and wear resistance and will resist stress in elevated temperature service. The alloy also has good ductility and excellent toughness.

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.

Download 4140 (AMS6349) Aerospace Low Aloy Steel Tube Datasheet

Typical Applications:

  • Axles
  • Conveyor parts
  • Spindles & shafts
  • Ring gears
  • Oil patch applications
  • Rams
  • Sprockets
  • Pinions

We offer 4140 (AMS6349) in pipe/tubes.


We offer a wide range of processing services throughout the Smiths Group both at our Head office in Biggleswade and at local service centre level. These services include tube cutting and honing services - this enables us to supply our pipe and tube material to your exact requirements.

Pick a Product

To find out more about Smiths Metal Centres extensive range of high quality aerospace stainless steel tubes, click on one of our products on the side menu of this web page.

Have a question or need a detailed quote?

Our staff are ready to take your call. For all supply and technical enquiries call us today
on 0845 527 3331 or click here to contact us.