31 Questions
What is the term used to describe the various types of fasteners and miscellaneous small items used to manufacture and repair aircraft?
Aircraft Hardware
According to AC 20-62E, what is the rule for the substitution of fasteners installed by the manufacturer?
Substitution is not allowed
What does PMA stand for in the context of aircraft parts?
Parts Manufacturing Approval
What aspect of fasteners in an aircraft has been considered by design engineers?
Type of loads it will encounter
What is the main difference between a bolt and a screw?
A bolt requires a nut to secure it, while a screw can work on its own
In the 1-inch diameter size, how many threads per inch do NF threads specify?
14 threads/inch
Which classification of bolts denotes a close fit?
Class 4
What is the material composition of National Aerospace Standard (NAS) bolts?
Cadmium or zinc-plated corrosion-resistant steel, unplated corrosion-resistant steel, and anodized aluminum alloys
What is the tensile strength of Military Standard (MS) bolts?
180,000 psi
Which head styles do Airforce Navy Bolts (AN bolts) come in?
(hex, clevis, and eyebolt)
What markings should a corrosion-resistant (stainless steel) bolt have on its head?
One raised dash
Which classification of threads specifies 12 threads/inch in the 1-inch diameter size?
(American National Fine) NF threads
Which type of bolt is almost always manufactured in the Class 3 medium fit?
(Aircraft bolts)
Which classification of bolts denotes a loose fit?
Class 1
What types of material composition are used for Aircraft bolts?
Cadmium or Zinc Plated Corrosion Resistant steel, Unplated Corrosion-resistant steel, and Anodized Aluminum Alloys only
Aircraft hardware is the term used to describe the various types of fasteners and miscellaneous small items used to manufacture and repair ______.
aircraft
QUALITY PARTS must be installed with ______.
quality
Fasteners are often used to assemble ______ parts and assemblies.
aircraft
Substitution of fasteners installed by the manufacturer may only be done with fasteners that have all of the same characteristics as the ______.
original
The main difference between a bolt and a ______ is that a typical screw can work on its own and a bolt requires a nut to secure it
screw
Bolts are used where great strength is required and screws are used where strength is not the deciding factor. The threaded end of the bolt is blunt while the ______ may be blunted or pointed
screw
The threaded end of the bolt usually has a ______ screwed onto it to complete the assembly
nut
For screw, the thread end may fit into a female receptacle or it may fit directly into the material being ______
secured
Bolts, STUDS AND ______
SCREWS
Classification of Threads: NC (American National Coarse) NF (American National Fine) UNC (American Standard Unified Coarse) UNF (American Standard Unified Fine) Note: There is one difference between the American national series and the American standard unified series. In the 1-inch diameter size NF threads specify 14 threads/inch and UNF threads specify 12 ______/inch
threads
Classification of Bolts Class 1 – loose fit Class 2 – free fit Class 3 – medium fit Class 4 – close ______
fit
Aircraft bolts are almost always manufactured in the Class 3, medium ______
fit
Aircraft bolts are fabricated from cadmium zinc plated corrosion resistant steel, un-plated corrosion resistant steel, or anodized aluminum ______
alloys
AN bolts, NAS bolts, and MS bolts Aircraft ______
Bolts
Tensile Strength – 125,000 psi AN ______
bolts
National Aerospace Standard (NAS bolts) – (hex, internal wrenching, and ______ style)
countersunk
Study Notes
Aircraft Hardware
- Aircraft hardware refers to the various types of fasteners and miscellaneous small items used to manufacture and repair aircraft.
Fasteners and Bolts
- Substitution of fasteners installed by the manufacturer can only be done with fasteners that have all of the same characteristics as the original.
- The main difference between a bolt and a screw is that a typical screw can work on its own, while a bolt requires a nut to secure it.
- Bolts are used where great strength is required, and screws are used where strength is not the deciding factor.
- The threaded end of a bolt usually has a nut screwed onto it to complete the assembly.
Threads and Classification
- NC (American National Coarse) and UNC (American Standard Unified Coarse) are classifications of threads with a coarse pitch.
- NF (American National Fine) and UNF (American Standard Unified Fine) are classifications of threads with a fine pitch.
- In the 1-inch diameter size, NF threads specify 14 threads/inch, and UNF threads specify 12 threads/inch.
Classification of Bolts
- Class 1 bolts have a loose fit, Class 2 bolts have a free fit, Class 3 bolts have a medium fit, and Class 4 bolts have a close fit.
- Aircraft bolts are almost always manufactured in the Class 3, medium fit.
- Aircraft bolts are fabricated from cadmium zinc plated corrosion-resistant steel, un-plated corrosion-resistant steel, or anodized aluminum.
Types of Bolts
- AN bolts (Air Force Navy Bolts) come in hex, internal wrenching, and other head styles.
- NAS bolts (National Aerospace Standard) are made from corrosion-resistant steel and come in hex, internal wrenching, and other head styles.
- MS bolts (Military Standard) have a tensile strength of 125,000 psi.
Other
- PMA stands for Parts Manufacturer Approval in the context of aircraft parts.
- Corrosion-resistant (stainless steel) bolts have specific markings on their heads.
Test your knowledge of aircraft hardware with this quiz. Learn about various types of fasteners and miscellaneous small items used to manufacture and repair aircraft, including welding, riveting, brazing, and bolting. Understand the importance of installing quality parts in aircraft construction.
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