What are the different types of aircraft fasteners?

Common fasteners used in the aerospace industry include the following:
  • Anchors.
  • Locking Bolts.
  • Hex Bolts.
  • Collars.
  • Security Screws.
  • Hex Nuts.
  • Pins.
  • Rivets.

How many fasteners are on a plane?

Nearly one million fasteners are used in a large aircraft and yet there is little discussion in the media about their important role in aircraft production. Everyone talks about wings, engines and assemblies, but the nuts and bolts of the operation are the poor relation.

What bolts are used for aircraft?

Aircraft quality bolts are made from alloy steel, stainless or corrosion resistant steel, aluminum alloys and titanium. Within our industry the first two are the most common. Aircraft bolts will always have a marking on their head. If you see no markings at all on the head of a bolt, do not use it.

What is the most common type of fasteners in aircraft construction?

Aircraft screws
Aircraft screws: These fasteners are the most common thread fastening method with a helical ridge, called an external thread. They are often composed of lower-strength materials than bolts and inserted with a loose-fitting thread.

What is a screw in aviation?

Screws are the most commonly used threaded fastening devices on aircraft. They differ from bolts inasmuch 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.

What is an aircraft rivet?

The Rivet Nut is a one-piece internally threaded and counterbored tubular aluminum rivet that can be pulled up or headed while working entirely from one side, forming a bulge or head on the blind side.

How many fasteners does a Boeing 747 have?

3 million
A modern Boeing 747 uses over 6 million individual parts in its construction. Of those parts, approximately 3 million are fasteners.

How many fasteners does a Boeing 777 have?

The 777 has about 3 million parts provided by 500 suppliers, including Alcoa Fastening Systems. Nearly one million fasteners, including internally and externally threaded, are used in each plane, bringing the total number of fasteners used in 777 production to approximately 1 billion.

Where are special fasteners used on aircraft?

Hi-Tigue special fasteners. Turnlock fasteners are used to secure inspection plates, doors, and other removable panels on aircraft. Turnlock fasteners are also referred to by such terms as quick opening, quick action, and stressed panel fasteners.

What is aircraft hardware?

Aircraft hardware is the term used to describe the various types of fasteners and miscellaneous small items used in the manufacture and repair of aircraft.

What are hi Lok fasteners?

The Hi-Lok fastener is a simple two-part fastener that suits many of today’s aerospace assembly needs. The all-purpose fastener can create a consistent torque on each fastener installed through integrated functions.

How are aircraft bolts made?

Aircraft bolts are fabricated from cadmium- or zincplated corrosion resistant steel, unplated corrosion resistant steel, or anodized aluminum alloys. Most bolts used in aircraft structures are either general purpose, AN bolts, or NAS internal wrenching or close tolerance bolts, or MS bolts.

What are special fasteners?

Special fasteners are a bolt used under industrial circumstances to hold pieces heavy weight industrial components together under extreme pressure. These screws are made out of materials highly resistant to corrosion. This is necessary because of the type of equipment they are expected to hold together.

What are aircraft washers?

Normally, plain and lock washers are used in aircraft structures. Plain washers are made of carbon steel and are used for nuts to protect the metal from being scratched when the nut is turned down. The plain washers also may be used as a shim under a nut to compensate for a bolt that is slightly long.

What grade are aircraft bolts?

Aerospace Bolts for High-Performance Applications

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Alloy Hex Cap Screws: offered in Grade 5 (MS90725 and MS90726); Grade 8 alloy steel or Grade BD alloy steel with zinc coating.

Do airplanes use screws?

There are several types of screws available for aircraft use; however, two of the most popular are the AN525 washer head and the AN526 screw. Both are protruding-head screws and can be purchased as either slotted or Phillips head.

What is a stud in aircraft?

Aerospace studs are a combination — a hybrid — between a bolt and a screw. One end of a stud functions as a bolt and the other functions as a screw.

What are aircraft screws made from?

Aircraft standard bolts are made with alloy steel, stainless or corrosion resistant steel, aluminium alloys and titanium. These allow the bolts to be both lighter and stronger than their commercial counterparts. They typically have a tensile strength of around 160,000 psi.

What is a rivet screw?

A rivet nut, also known as a blind nut or nut-sert, is a one-piece internally threaded and counterbored tubular rivet that can be anchored entirely from one side. There are two types: one is designed to form a bulge on the back side of the panel as a screw is tightened in its threads.

What is a threaded rivet?

April 15, 2019. As a variation of the standard rivet, a threaded nut insert, also known as a blind rivet nut or rivet nut, is a mechanical fastener. This counter-bored, tubular, one-piece rivet has internal threads that is anchored entirely from just the one side of the material in which it’s installed.

How do bolt rivets work?

How many rivets are in a jumbo jet?

Building an airplane is a complex, if not monumental, undertaking. There are 6 million parts on one 747, for example – 40,000 rivets on each wing.

How are planes riveted?

From the Airbus A330 to the Boeing 787, practically all commercial aircraft are manufactured with riveted joints instead of welded joints. With riveted joints, two components are connected using a fastener known as a rivet. There are different types of rivets, including lap joints and butt joints.

How many rivets does a 737 have?

It’s tough work for pairs of humans who install each of the 60,000 rivets that keep Boeing’s 777 from falling apart in midair, so they’re getting some help from pairs of robots on the plane production line.

How many moving parts does a 747 have?

A Boeing 747 is made up of six million parts which are made to be all controlled by a few pilots sitting up front with switches and buttons.

How do you make a Boeing 747?

How much fuel can a 777 300ER hold?

Boeing 777 Classics Table
Variant 777-200 777-300ER
Maximum Fuel Capacity. 117,348 Ltrs(31,000 US Gal) 181,283 Ltrs(47,890 US Gal)
Service Ceiling 43,100 ft (13,140 m)
Engines x2 Options PW 4077RR 877GE90-77B GE90-115B1
Engine Thrust per engine. PW: 77,000 lbf (342 kN)RR: 76,000 lbf (338 kN)GE: 77,000 lbf (342 kN)

18 more rows

What is a huck bolt?

Whereas conventional bolts are set using a nut, a Huck bolt is set using a permanent sleeve or collar that fits around a grooved pin. The collar is fitted into a pre-drilled hole and as the collar is tightened, it is squeezed and forced into the grooves of the pin to swage the collar.

How should bolt shanks be installed in aircraft structures?

Bolts should always be placed in the direction specified by the aircraft or engine manufacturer. However, in the absence of specific instructions, bolt heads should be installed upward or in a forward direction. This helps prevent the bolt from slipping out if the nut comes off.

What is an Eddie bolt?

The Eddie-Bolt® 2 is a high-performance aerospace fastening system. The Eddie-PinTM is designed with five flutes in the upper portion of the threaded area which allow a positive mechanical lock to be made during installation with the free-running Eddie-NutTM.

What three types of screws are most commonly used in aircraft construction?

Three types of screws are usually found on an aircraft: machine screws, structural screws, and self-tapping screws. Drive screws are also used but they are actually driven like a nail rather than being threaded like a screw.

How do you identify aircraft hardware?

Aircraft hardware is usually identified by its specification number or trade name. Threaded fasteners and rivets are usually identified by AN (Air Force-Navy), NAS (National Aircraft Standard), and MS (Military Standard) numbers.

What is the importance of aircraft hardware?

The importance of aircraft hardware is often overlooked because of the small size of most items. However, the safe and efficient operation of any aircraft depends upon the correct selection and use of aircraft hardware.

What are the advantages of hi Lok fasteners?

The advantages of Hi-Lok® two-piece fastener include its light weight, high fatigue resistance, high strength, and its inability to be overtorqued. The pins, made from alloy steel, corrosion resistant steel, or titanium alloy, come in many standard and oversized shank diameters.

How does Hilok work?

Why use wet install fasteners?

Most fasteners used in aircraft manufacturing are installed wet. The rivets or bolts are covered with sealant during installation. The process prevents moisture from penetrating the aircraft and provides corrosion protection to critical areas, such as the fuel tanks.

What is an aircraft nut?

Aircraft nuts are made in a variety of shapes and sizes. They are made of cadmium plated carbon steel, stainless steel, or anodized 2024T aluminum alloy, and may be obtained with either right or left-hand threads. No identifying marking or lettering appears on nuts.

What is the difference between the 2 countersunk screw heads used in aircraft screws?

Most aircraft countersunk screws have a 100 degree countersink angle, whereas in the US most commercial grade countersunk screws have an 82 degree angle. England uses a 90 degree countersink angle.

How are aircraft bolts measured?

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. See table for conversion of length and/or grip to proper AN call-out.

What are three types of fasteners?

There are three main types of threaded fastener; Bolts, Screws and Studs. Bolts have a head on one end (this is usually a hex head) and are threaded on the other. They are generally used in conjunction with a nut (and sometimes a washer) to hold them in place.

How do you identify a fastener?

Fasteners are identified by four or five attributes; Type, Material, Diameter, Length, and Thread Pitch or Count (machine thread fasteners only).

What is fastening process?

What is fastening? It is a temporary joining process. Fastening is one temporary joining process that employs additional elements to mechanically assemble or attach two or more parts together. Additional mechanical elements that are used for fastening is called fasteners.
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