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Mil Spec Fasteners Materials

Blake Marciszewski

Blake Marciszewski

Metric Bolt is a family run company with an inventory of military fasteners.

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Metric Bolt is a DFARs compliant distributor of military spec fasteners.

Military spec fasteners (mil-spec) are critical components in a wide range of military and aerospace applications, where their strength, durability, and reliability are essential for safe and effective operation.

One of the most important factors that contribute to the performance of military fasteners is the material from which they are made. The materials used must be able to withstand extreme conditions, such as high temperatures, high pressures, and corrosive environments while maintaining their structural integrity.

Metric Bolt offers different mil-spec fasteners in different material types.
Military fasteners, such as socket head cap screws, need to be made from high-quality materials

In this blog post, we will explore some of the common materials used in Mil-Spec fasteners, their properties, and their applications.

What materials are used to make military fasteners?

There are several materials commonly used in military fasteners, such as machine screws. They all have unique properties that make them suitable for specific applications.

Here are some of the most common materials used in military hardware:


Corrosion resistant steel is a popular material for Mil-Spec fasteners due to its high strength, toughness, and durability.

Different grades of steel are used depending on the specific application. For example, low-alloy steels are often used in high-temperature and high-pressure environments, while high-strength steels are used in applications requiring high tensile strength.


Titanium is a lightweight, high-strength material that is often used in aerospace applications where weight is a critical factor.

It has excellent corrosion resistance, even in seawater environments, and can withstand extreme temperatures. Titanium fasteners are often used in aircraft and spacecraft structures.

Metric Bolt is a leading distributor of mil-spec fasteners in various materials.
Titanium MS fasteners are often used in the aerospace industry


Aluminum is a lightweight material that is commonly used in Mil-Spec fasteners for aerospace applications. It has good strength-to-weight ratio and excellent corrosion resistance.

Aluminum fasteners are often used in aircraft and spacecraft structures.


Inconel is a nickel-chromium alloy that is known for its excellent high-temperature strength and corrosion resistance.

It is often used in fasteners for gas turbine engines and other high-temperature applications.


Monel is a nickel-copper alloy that is known for its excellent corrosion resistance, particularly in marine environments.

Monel tends to be used in bolts, nuts, and fasteners for marine applications.

Stainless Steel

Stainless steel is a corrosion-resistant material that is commonly used in Mil-Spec fasteners for applications requiring high corrosion resistance.

It is often used in marine, chemical, and food processing industries.

Stringent requirements for fastener products to meet military standards

The material requirements for military hardware, including fasteners, are set by the United States Department of Defense (DoD) through a set of military specifications and standards.

These specifications and standards establish requirements for raw material traceability, manufacturing processes, testing, and quality control of military hardware, including fasteners.

The DoD specifies the materials that can be used in military hardware, including fasteners. The materials must meet certain requirements for strength, durability, and corrosion resistance, and must be able to withstand extreme conditions.

How to choose the right material for fastener products used in military applications

Choosing the right material for military fasteners depends on the specific application and the requirements of the hardware being used. Here are some factors to consider when choosing the right material for military fasteners:

  1. Strength – The material must be strong enough to withstand the forces and loads placed on it in the application. Consider the ultimate tensile strength, yield strength, and shear strength of the material.
  2. Durability – The material must be able to withstand the harsh conditions of the application, including exposure to heat, pressure, and corrosive environments. Consider the material’s resistance to fatigue, wear, and corrosion.
  3. Weight – The weight of the fasteners can impact the overall weight of the equipment, which can affect performance and efficiency. Consider the weight of the material and its strength-to-weight ratio.
  4. Cost – The cost of the material is an important factor to consider, as it can impact the overall cost of the equipment. Consider the cost of the material and its availability.
  5. Compatibility – The material must be compatible with the other materials used in the equipment, as well as the operating environment. Consider the potential for galvanic corrosion when different materials come into contact with each other.
  6. Industry Standards – There are industry standards and military specifications for materials used in military fasteners. Consider these standards and specifications when choosing the right material.

Material choice is key to ensure quality and to adhere to the military standard

As you can see, selecting the right material for military fasteners is a critical decision that requires careful consideration.

After all, military fasteners are subject to strict requirements designed to ensure that the fasteners meet the highest standards of quality and performance, and are able to withstand the extreme conditions encountered in military and aerospace applications.

By carefully evaluating the specific requirements of the application and selecting a material that meets those requirements while also considering factors such as strength, durability, weight, cost, compatibility, and industry standards, one can ensure that the military fasteners will perform reliably and effectively in the intended application.

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Metric Bolt is a leading supplier of military screws and fastening hardware.

Military Screws

When buying any sort of military equipment, you need to be extra careful in your selection process. Mil-spec fasteners, such as military screws, have strict

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