ThePipingMart Blog Grades AMS 4168 Aluminium Alloy – Composition, Properties and Uses

AMS 4168 Aluminium Alloy – Composition, Properties and Uses

AMS 4168

AMS 4168 is a high-strength alloy that offers great resistance to corrosion and wear. It is widely used in the aerospace, marine, and automotive industries due to its impressive mechanical properties. Whether you are a professional engineer or a student studying metallurgy, it’s worthwhile to know the essential facts about AMS4168. In this post, we’ll delve into the composition, properties, and practical applications of AMS4168.

What is AMS 4168?

AMS 4168 (also known as Aluminium 7075 Alloy) is a specification that outlines the requirements for high-performance thermoplastics in the aerospace industry. This specification covers a range of materials, including polyetherimide (PEI), polyetheretherketone (PEEK), and polyphenylene sulfide (PPS). AMS4168 outlines the physical, mechanical, and thermal properties these materials must possess to be suitable for critical aerospace applications. By meeting these stringent requirements, materials that conform to the specification ensure the safety and reliability of aircraft and spacecraft components.

What Forms is AMS 4168 Available at Piping Mart?

  • Pipes
  • Tubing

AMS 4168 Composition

AMS 4168 is an aluminium bronze alloy known for its high copper content (81% to 86%). It also contains small nickel and iron, enhancing its mechanical properties. Some AMS 4168 may also include lead and manganese to improve machinability and anti-seizing characteristics.

Component Elements Properties Metric English Comments
Aluminum, Al 87.1 – 91.4 % 87.1 – 91.4 % As remainder
Chromium, Cr 0.18 – 0.28 % 0.18 – 0.28 %
Copper, Cu 1.2 – 2.0 % 1.2 – 2.0 %
Iron, Fe <= 0.50 % <= 0.50 %
Magnesium, Mg 2.1 – 2.9 % 2.1 – 2.9 %
Manganese, Mn <= 0.30 % <= 0.30 %
Other, each <= 0.05 % <= 0.05 %
Other, total <= 0.15 % <= 0.15 %
Silicon, Si <= 0.40 % <= 0.40 %
Titanium, Ti <= 0.20 % <= 0.20 %
Zinc, Zn 5.1 – 6.1 % 5.1 – 6.1 %

AMS 4168 Physical Properties

AMS 4168 has excellent physical properties, making it an ideal choice for high-stress applications. It has a density of 7.74 g/cm3, a melting point of 1,040°C and a thermal conductivity of 53 W/mK. Its coefficient of thermal expansion is relatively low at 17.7 x 10-6 m/mK, which means it can retain its shape and dimensions even in high-temperature environments. Moreover, its electrical conductivity of 7% IACS makes it suitable for electrical connectors and conductive components.

Physical Properties Metric English Comments
Density 2.81 g/cc 0.102 lb/in³ AA; Typical

AMS 4168 Mechanical Properties

One of the most significant advantages of AMS 4168 is its exceptional mechanical properties. It has a tensile strength of 860 MPa, yield strength of 345 MPa, and an elongation of 8%. Its compressive strength of 1,450 MPa and high fatigue strength make it an ideal material for high-load bearings and heavy-duty gearboxes. Moreover, its toughness and flexibility are necessary for applications requiring high resistance to impact and shock.

AMS 4168 Uses

AMS 4168 is a versatile alloy that can serve various industrial applications. Its excellent resistance to wear and corrosion makes it an ideal material for marine components, such as propellers, shafts and fasteners. In the aerospace industry, it makes landing gear components, bearings and hydraulic actuators. Its high strength and fatigue resistance makes it suitable for automotive parts, such as engine components, bearings and gears.

AMS 4168 Hardness and Heat Treatment

AMS 4168 is a relatively hard alloy with a Brinell hardness of 215. It can be heat-treated to enhance its strength and wear resistance. Solution treatment at 800°C followed by air-cooling can improve its machinability, while precipitation hardening at 550°C for six hours can increase its strength and toughness.


AMS 4168 material is an excellent high-strength alloy that has a unique combination of physical and mechanical properties. Its exceptional resistance to wear and corrosion and its strength and toughness make it ideal for various industrial applications. Whether you are designing marine components, aerospace parts, or heavy-duty machinery, AMS 4168 can provide the solution you need. Understanding its composition, properties, and heat treatment options can help you choose the right material for your project and ensure optimal performance and durability.

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AMS 4168 Aluminium Alloy – Composition, Properties and Uses

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