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Question

Why should the grip length of a bolt be a few thousandths off an inch shorter than the material thickness?
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What factors do you use to determine the length of a bolt?
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ASM CDC Volume 3

QuestionAnswer
Why should the grip length of a bolt be a few thousandths off an inch shorter than the material thickness? To prevent bottoming of the nut
What factors do you use to determine the length of a bolt? 1) Grip length 2)Threaded Parts
What are two methods for identifying bolts? 1) Bolt Head Marking 2) Part number designation
Where do you look if you cannot identify the code marked on the head of a *bolt*? (Hint: What is the hardware T.O?) T.O 1-1A-8
What kind of information does the part number designation give you about a bolt? 1) Type of bolt 2) Diameter 3) Length of grip 4) If the head or shank is drilled
Why must bolt holes not be oversized or elongated? The bolt will not carry its shear load, causing the part to be deformed.
When can you drill or ream a hold to accommodate an oversized diameter or the next-larger bolt? If the larger hole doesn’t weaken the part.
How can you avoid stripping the threads of a bolt during installation? Torque all nuts to proper specifications
How can you remove stuck screws? By using fastener removal tools or fastener extractors. 1) Screw knocker 2) Jay Bar 3) Drilling 4) Easy-outs.
Which screw removal is primarily designed for use in flat surfaces? Fastener removal tool
When using a fastener extractor, what is the first step in removing a screw? (Hint: What do you do when the screw head has been stripped)? Ball file & drill a hole in the center
How should you tap a screw punch (Screw Knocker) when removing a stuck screw? Why? Lightly; Heavy blows can cause you to strip the screw head & damage the structure.
How can you identify a nut that has no identification Markings? 1) Part Number 2) Color 3) Thread Size 4) Construction 5) Luster
What are the two types of self-locking nuts that you are most likely to use in an aircraft? 1) Prevailing-torque 2) Free-Spinning
What type of wrench is preferred for nut installation? Socket & Box-End Wrenches
How can you prevent fatigue failure in bolted assemblies? By sufficiently tightening the bolt & applying proper preload or clamping force
How can you reduce the tendency of parts to creep or shift when installing bolts? By following the proper torque specifications
What factors can alter standard torque chart values? Thread roughness, paint, lube, hardening, & plating
What are the three main parts of a camloc fastener? Stud Assembly, grommet, & receptacle
What should you NEVER do to a camloc stud? Disassemble it.
How can you determine the grip length of a camloc stud? By the number stamped on the head of the stud
What should you use to replace a rigid receptacle? A floating type receptacle
What should you do after you punch the hole for the grommet? Deburr & sand the edges smooth
If it is required, when do you install a stud retaining ring? When the stud is installed in the grommet
What is the last step of a camloc installation? Check the grip length of the stud
What are the three main parts of an airlock fastener? Stud, cross-pin, & receptacle
How can you determine the grip length of an airlock stud? By checking the head marking on the stud
How do you determine the proper stud length of an airlock stud? Refer to T.O. 1-1A-8 & the Aircraft specific T.O.
What is the final step in airlock installation? Checking the alignment & fastening the airlock stud
How can you correct misalignment of an airlock fastener? 1) Fastening the studs in a different order. 2) Install a longer stud. 3) Make the stud hole slightly larger. 4) Replace rigid type receptacle. 5) Stud & cross-pin.
Created by: Jtball101
 

 



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