Chapter 5 - Fastener And Threads Flashcards
1
Q
What are the most common fasteners in the mechanical trades?
A
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2
Q
List the purposes of threads.
A
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3
Q
Define the following:
- external threads
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4
Q
Define the following:
- internal threads
A
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5
Q
Define the following:
- pitch
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6
Q
Define the following:
- major diameter
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7
Q
Define the following:
- minor diameter
A
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8
Q
Define the following:
- nominal diameter
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9
Q
Define the following:
- pitch diameter
A
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10
Q
Define the following:
- lead
A
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11
Q
Define the following:
- crest
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12
Q
Define the following:
- root
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13
Q
Define the following:
- side or flank
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14
Q
Define the following:
- single depth of thread
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15
Q
Define the following:
- thickness of thread
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16
Q
Define the following:
- fit
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17
Q
Define the following:
- tolerance
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18
Q
Define the following:
- allowance
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19
Q
Define the following:
- thread angle
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20
Q
Define the following:
- helix angle
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21
Q
How are right-hand and left-hand threads identified?
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22
Q
Name one application for left-hand threads.
A
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23
Q
What is the purpose of using multiple threads?
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24
Q
What does the nominal size of a threaded fastener refer to?
A
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25
How is the fasteners load distributed on the threads of the nut?
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26
Define the following:
| 1/2” - 13 UNC - 2A x 1” lg
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27
Describe a class 3 thread fit.
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28
How does a millwright identify the thread form on a bolt?
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29
Compare American National Threads to Unified Screw Threads in all designations
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30
Describe the constant pitch series threads and state their applications
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31
Describe Acme Threads and state their applications.
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32
Describe National Pipe Taper (NPT) Threads and American dry-seal threads and state their applications.
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33
Describe ISO metric series threads.
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34
Describe the following fastener:
| M10 x 1.50 x 60mm
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35
How many threads per inch on a 5/8” UNC bolt?
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36
Do 1” adjustable pipe dies cut proper threads on 2” pipe?
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37
Define:
| - bolt
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38
Define:
| - cap screw
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39
Define:
| - stud
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40
How are bolts, nuts and cap screws classified?
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41
What is the tensile strength of:
| - a grade 5 bolt?
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42
What is the tensile strength of:
| - a socket head cap screw?
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43
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What is the tensile strength of:
- an ISO 4762 class 8.8 cap screw?
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44
What is the purpose of the different head designs for bolts and cap screws?
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45
Describe the nut designs available.
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46
How are nut sizes identified?
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47
What is the major diameter and threads per inch of #10 - 32 machine screw?
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48
Describe the applications for self-tapping and self-drilling, self-tapping machine screw?
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49
What are the purposes of flat washers and how are sizes identified?
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50
Describe locking-type washers
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51
Describe the applications for:
| - cotter pins
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52
Describe the applications for:
| - headed pins (clevis pin)
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53
Describe the applications for:
| - taper pins
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54
Describe the applications for:
| - dowel pins
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55
Describe the applications for:
| - shear pins
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56
Describe the applications for:
| - spring pins and roll (coiled) pins
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57
Describe the applications for:
| - grooved pins
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58
Describe the applications for:
| - convenience pins
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59
What are the applications for taper, plug and bottoming taps?
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60
Why are tap wrenches beneficial?
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61
How is tap drill size determined? (3 methods)
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62
Why is it important to have a sharp tap?
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63
Describe the process of tapping a hole.
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64
Describe three methods used to remove a broken tap.
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65
Describe the dies and die stocks used for external threads
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66
How is the work prepared for external thread cutting.
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67
Describe the process of cutting external threads
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68
How is slight damage of threads repaired?
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69
Describe four methods used to restore severely damaged internal threads
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70
How are tight and rusted studs removed?
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71
Describe how studs are removed if broken above threaded surface
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72
Describe how studs are removed if broken flush or below threaded surface
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73
How can threaded fasteners fail during installation?
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74
How are threaded fastener failures avoided?
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75
Define:
| - elastic limit
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76
Define:
| - yield point
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77
Define:
| - ultimate tensile strength (uts)
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78
What are the reasons for preloading?
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79
Describe the following:
| - preload indicating washers
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80
Describe the following:
| - preload indicating bolts
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81
Describe the following:
| - torque nuts and torque bolts
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82
Describe the following:
| - measured elongation of fasteners
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83
Describe the following:
| - turn of the nut
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84
Describe:
| - torque-limiting wrench
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85
Describe:
| - dial-indicating torque wrench
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86
Describe:
| - deflecting-beam torque wrench
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87
Describe:
| - torque multiplier
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88
Describe:
| - hydraulic torque wrenches
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89
Describe:
| - using adapters
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90
What are the purposes of the torque values shown in service manuals?
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91
What does correct torque value depend upon?
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92
What effect does lubrication have on torque values?
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93
What is the recommended torque in ft.lbf for a grade 8 bolt 3/4-16 in an oiled condition?
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