Aircraft Nuts and Fasteners

Aircraft nuts are fasteners that are used to secure parts together. They come in various shapes and sizes and are made from different materials, ensuring they are strong and reliable for aircraft applications.

Cadmium-plated carbon steel, stainless steel, and anodized 2024T aluminum alloy are common materials used in aircraft nut manufacturing, each offering specific strength and corrosion resistance.

Aircraft nuts are available with either right-hand or left-hand threads. Right-hand threads tighten when rotated clockwise, while left-hand threads tighten when rotated counterclockwise.

For easy identification, self-locking nuts may be marked with a visible metallic luster or color that contrasts with the base material.

Non-self-locking nuts rely on external locking devices like cotter pins, safety wires, or locknuts to stay secure. These devices prevent the nut from loosening due to vibrations or other factors.

Self-locking nuts have an integrated locking feature that eliminates the need for external locking mechanisms. They are designed to stay put even under demanding aircraft conditions.

Plain nuts, castle nuts, castellated shear nuts, plain hex nuts, light hex nuts, and plain check nuts are examples of non-self-locking nuts. They require external locking devices for secure fastening.

Aircraft nuts are crucial for maintaining the structural integrity and safety of aircraft. Careful selection and proper installation are essential to ensure reliable performance.

A type of nut used with drilled shank bolts, Clevis bolts, eyebolts, drilled head bolts, or studs. It has slots (castellations) for safetying with a cotter pin or lock wire.

Designed for use with devices like drilled Clevis bolts and threaded taper pins subjected to shearing stress only. It also has castellations for safetying but is less deep and strong than the castle nut.

A rugged nut suitable for large tensional loads but requires an auxiliary locking device like a check nut or lock washer.

A lighter nut than the plain hex nut, used for light tension requirements and requiring an auxiliary locking device.

Used as a locking device for plain nuts, set screws, threaded rod ends, and other devices.

Designed for situations requiring hand-tightening and frequent assembly removal.

Nuts that have built-in safety features and don't require auxiliary locking devices.

Common applications of self-locking nuts include:

A type of fastener used on aircraft to prevent loosening under vibration, consisting of two sections: a locking nut and a load-carrying nut, connected by a spring.

The section of a Boots self-locking nut that bears the load and has the thread strength of a standard nut.

The section of a Boots self-locking nut that utilizes a spring to exert a constant locking force against the bolt.

A type of self-locking nut that uses a spring to create a constant force against the bolt, preventing loosening.

The spring inside a Boots self-locking nut that keeps the locking and load-carrying sections apart and creates the locking force.

A type of Boots self-locking nut that is most commonly used for sizes ranging from No. 6 to 1/4 inch.

A type of Boots self-locking nut that is used for sizes ranging from 1/4 inch to 1/6 inch.

A type of Boots self-locking nut that is used for sizes ranging from No. 8 to 3/8 inch.

A type of nut that uses internal friction to prevent loosening.

Aluminum alloy nuts are often anodized for corrosion resistance, while steel nuts are commonly cadmium plated.

They can be reused multiple times as long as the fiber insert is still effective and the nut can be tightened properly.

The rounded or chamfered end of the fastener should extend fully, but flat ends should protrude at least 1/32 of an inch.

No, tapping the fiber insert reduces its locking effectiveness due to material compression.

Self-locking nuts should not be used in environments exceeding 250°F.

Sheet spring nuts, also known as speed nuts, are commonly used with self-tapping screws in non-structural applications.

These bases are designed to accommodate multiple nuts, typically riveted or welded to the aircraft structure.

A nut made of brass, used specifically with a #10 bolt and a thread pitch of 32 threads per inch.

A type of aircraft nut made of 2024-T aluminum alloy. The code "D" indicates the material. The number "5" represents a diameter of 5/16 inch, and "R" indicates right-hand thread.

This nut is made of cadmium-plated carbon steel, and the code "10" represents a 5/8 inch diameter and 18 threads per inch. It is usually right-hand thread.

These nuts are commonly used in various aircraft applications to secure components like access doors, conduit clamps, and line clamps.

A straightforward nut used in many aircraft applications, but it requires a separate locking device like a cotter pin or a lock washer to stay put.