16 Questions
What term is used to describe the various types of fasteners and miscellaneous small items used to manufacture and repair aircraft?
Aircraft fasteners
According to AC 20-62E, what is the requirement for installing replacement parts related to fasteners?
Substitution of fasteners is allowed with similar characteristics
What type of fastener are bolts and screws classified as?
Threaded fastener
Where are bolts typically used?
Where great strength is required
What is the deciding factor for using screws?
Strength
What is usually screwed onto the threaded end of a bolt to complete the assembly?
Nut
What is the standard thread for 1-inch diameter size bolts with 14 threads?
NF (American National Fine)
What is the tensile strength of Military Standard Bolts (MS bolts)?
180,000 psi
What are the material composition options for AN BOLTS?
Cadmium or Zinc Plated Corrosion Resistant steel, Unplated Corrosion-resistant steel, and anodized aluminum alloys
How can Close Tolerance NAS Bolts be identified?
By a raised or recessed triangle marking
What is the distinguishing feature on the head of a corrosion-resistant (stainless steel) bolt?
One raised dash
What does the letter 'H' preceding the '5' indicate in the identification of a bolt?
The head of the bolt is drilled for safetying
What is the expected usage of a bolt identified as AN3DD5A?
Shear load applications
What is the use of Close Tolerance Bolts?
Applications requiring a very tight fit
What does the lesson mention about the use of aluminum alloy nuts with cadmium-plated steel bolts on land airplanes?
They are not used on seaplanes.
What is the classification of threads for 1-inch diameter size bolts with 12 threads?
NC (American National Coarse)
Study Notes
Aircraft Fasteners
- The term used to describe various types of fasteners and miscellaneous small items used to manufacture and repair aircraft is not specified in the provided text.
Bolts and Screws
- Bolts and screws are classified as threaded fasteners.
- Bolts are typically used in structural applications where high strength and resistance to vibration and shear are necessary.
- The deciding factor for using screws is that they provide a simple and efficient way to assemble components.
Bolt Identification and Specifications
- A nut is usually screwed onto the threaded end of a bolt to complete the assembly.
- The standard thread for 1-inch diameter size bolts with 14 threads is not specified in the provided text, but it is unified national coarse (UNC).
- Military Standard Bolts (MS bolts) have a minimum tensile strength of 125,000 psi.
- AN Bolts can be composed of either steel, cadmium-plated steel, or corrosion-resistant (stainless) steel.
Close Tolerance NAS Bolts
- Close Tolerance NAS Bolts can be identified by the "NAS" prefix in the part number.
- The distinguishing feature on the head of a corrosion-resistant (stainless steel) bolt is a circle around the "R" in the marking.
Bolt Identification and Usage
- When the letter 'H' precedes the '5' in the identification of a bolt, it indicates a heavy bolt.
- A bolt identified as AN3DD5A is expected to be used in an application requiring high strength and resistance to vibration and shear.
- Close Tolerance Bolts are used in critical structural applications where high strength and resistance to vibration and shear are necessary.
Additional Information
- It is not recommended to use aluminum alloy nuts with cadmium-plated steel bolts on land airplanes because of galvanic corrosion concerns.
- Threads for 1-inch diameter size bolts with 12 threads are classified as unified national coarse (UNC).
Test your knowledge of aircraft hardware, fasteners, and methods of combining metals used in aircraft manufacturing and repair. Learn about welding, brazing, riveting, and the importance of using proper fasteners in the aviation industry.
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