Chapter 5 - Fastener And Threads Flashcards
What are the most common fasteners in the mechanical trades?
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List the purposes of threads.
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Define the following:
- external threads
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Define the following:
- internal threads
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Define the following:
- pitch
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Define the following:
- major diameter
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Define the following:
- minor diameter
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Define the following:
- nominal diameter
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Define the following:
- pitch diameter
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Define the following:
- lead
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Define the following:
- crest
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Define the following:
- root
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Define the following:
- side or flank
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Define the following:
- single depth of thread
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Define the following:
- thickness of thread
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Define the following:
- fit
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Define the following:
- tolerance
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Define the following:
- allowance
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Define the following:
- thread angle
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Define the following:
- helix angle
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How are right-hand and left-hand threads identified?
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Name one application for left-hand threads.
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What is the purpose of using multiple threads?
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What does the nominal size of a threaded fastener refer to?
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How is the fasteners load distributed on the threads of the nut?
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Define the following:
1/2” - 13 UNC - 2A x 1” lg
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Describe a class 3 thread fit.
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How does a millwright identify the thread form on a bolt?
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Compare American National Threads to Unified Screw Threads in all designations
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Describe the constant pitch series threads and state their applications
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Describe Acme Threads and state their applications.
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Describe National Pipe Taper (NPT) Threads and American dry-seal threads and state their applications.
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Describe ISO metric series threads.
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Describe the following fastener:
M10 x 1.50 x 60mm
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How many threads per inch on a 5/8” UNC bolt?
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Do 1” adjustable pipe dies cut proper threads on 2” pipe?
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Define:
- bolt
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Define:
- cap screw
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Define:
- stud
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How are bolts, nuts and cap screws classified?
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What is the tensile strength of:
- a grade 5 bolt?
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What is the tensile strength of:
- a socket head cap screw?
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What is the tensile strength of: - an ISO 4762 class 8.8 cap screw?
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What is the purpose of the different head designs for bolts and cap screws?
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Describe the nut designs available.
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How are nut sizes identified?
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What is the major diameter and threads per inch of #10 - 32 machine screw?
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Describe the applications for self-tapping and self-drilling, self-tapping machine screw?
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What are the purposes of flat washers and how are sizes identified?
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Describe locking-type washers
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Describe the applications for:
- cotter pins
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Describe the applications for:
- headed pins (clevis pin)
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Describe the applications for:
- taper pins
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Describe the applications for:
- dowel pins
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Describe the applications for:
- shear pins
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Describe the applications for:
- spring pins and roll (coiled) pins
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Describe the applications for:
- grooved pins
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Describe the applications for:
- convenience pins
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What are the applications for taper, plug and bottoming taps?
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Why are tap wrenches beneficial?
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How is tap drill size determined? (3 methods)
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Why is it important to have a sharp tap?
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Describe the process of tapping a hole.
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Describe three methods used to remove a broken tap.
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Describe the dies and die stocks used for external threads
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How is the work prepared for external thread cutting.
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Describe the process of cutting external threads
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How is slight damage of threads repaired?
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Describe four methods used to restore severely damaged internal threads
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How are tight and rusted studs removed?
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Describe how studs are removed if broken above threaded surface
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Describe how studs are removed if broken flush or below threaded surface
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How can threaded fasteners fail during installation?
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How are threaded fastener failures avoided?
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Define:
- elastic limit
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Define:
- yield point
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Define:
- ultimate tensile strength (uts)
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What are the reasons for preloading?
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Describe the following:
- preload indicating washers
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Describe the following:
- preload indicating bolts
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Describe the following:
- torque nuts and torque bolts
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Describe the following:
- measured elongation of fasteners
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Describe the following:
- turn of the nut
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Describe:
- torque-limiting wrench
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Describe:
- dial-indicating torque wrench
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Describe:
- deflecting-beam torque wrench
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Describe:
- torque multiplier
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Describe:
- hydraulic torque wrenches
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Describe:
- using adapters
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What are the purposes of the torque values shown in service manuals?
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What does correct torque value depend upon?
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What effect does lubrication have on torque values?
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What is the recommended torque in ft.lbf for a grade 8 bolt 3/4-16 in an oiled condition?
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