Fasteners

Submitted by ewadmin on Mon, 06/01/2020 - 21:59
Fasteners

An extensive range of fasteners and other hardware items used in aircraft construction and industrial applications. They are offered both under different brands of various manufacturers or as part of our own branded (AVIATIONEU NEW ERA) product line. More information on specific fasteners can be found at our Web Platform for Supplies. Our offered product line includes indicatively:

 

 

Screws and Bolts

Screws are the most commonly used threaded fastening devices on aircraft. They differ from bolts as they are generally made of lower strength materials. They can be installed with a loose fitting thread, and the head shapes are made to engage a screwdriver or wrench. Some screws have a clearly defined grip or unthreaded portion while others are threaded along their entire length. Several types of structural screws differ from the standard structural bolts only in head style. The material in them is the same, and a definite grip length is provided. The AN525 washer head screw and the NAS220 through NAS227 series are such screws. Commonly used aircraft screws are classified in three groups: (1) Structural screws, made of alloy steel, which have the same strength as equal size bolts; (2) machine screws, usually of flathead (countersunk), roundhead, or washer head types. These screws are general purpose screws for general repair and are available in low carbon steel, brass, corrosion resistant steel, and aluminum alloy; and (3) self-tapping screws, which are used for attaching lighter parts. A fourth group, drive screws, are not actually screws but nails. They are driven into metal parts with a mallet or hammer and their heads are not slotted or recessed.

AN Bolts commonly used in aviation applications are manufactured to the "Army-Navy" military standard, predecessor to "Mil-Spec" (MS) and "National Aerospace Standard" (NAS) which followed. AN Bolts are typically cadmium plated per specification QQ-P-416A, Type II, Class 3 for superior corrosion resistance as compared to commercial grade zinc plated bolts. Made of high-strength type 4037 or 8740 alloy steel, hex head aircraft bolts are centerless ground and threaded after heat treatment. Minimum tensile strength 125,000 PSI. Available with shank drilled for cotter pin or undrilled for stop nut application, and with or without drilled head for safety wire. Bolts with undrilled shank are specified by letter "A" after the dash number. The length of AN aircraft bolts is measured from under the head to the end of the shank. The "grip" is the unthreaded portion of the shank. "C" stands for stainless steel. Threads are pressed into the steel, not cut, thus maintaining strength throughout the entire shank. The surface under the head of AN bolts is designed to be a bearing surface to reduce non-uniform stress as the bolt is torqued thus reducing premature fatigue.

Nuts

Aircraft nuts are made of cadmium plated carbon steel, stainless steel, or anodized 2024T aluminum alloy and come in a variety of shapes and sizes. They can be divided into two general groups: non self-locking and self-locking nuts. Non self-locking nuts are those that must be safetied by external locking devices, such as cotter pins, safety wire, or locknuts. Self-locking nuts contain the locking feature as an integral part.

Rivets

There are a number of types of rivets, designed to meet different cost, accessibility, and strength requirements. Solid shank rivets, relatively low-cost,  permanently installed fasteners used as structural parts of aircraft applications where reliability and safety count. Such rivets are made in their majority from aluminum alloy and come with rounded (universal) or 100° countersunk heads Other rivet types include a) High-strength structural steel rivets and semi-tubular rivets (also known as tubular rivets) similar to solid rivets, except they have a partial hole (opposite the head) at the tip and b) Blind rivets available in flat head, countersunk head, and modified flush head which are used mainly when access to the joint is available from only one side.

Clamps

Clamps, like other fasteners are used to hold or secure objects tightly together to prevent movement or separation through the application of inward pressure. Different types of clamps are used in aviation industry including AN735 loop-type bonding clamps, AN737 hose clamps, AN741 tube clamps, AN742  loop-type support clamps etc. meeting Aeronautical Standard requirements.

Hinges

Military Standard metal hinges for use in the worldwide commercial and military aerospace industry.