Chapter 5 - Fastener And Threads

Question 1

What are the most common fasteners in the mechanical trades?

Answer 1

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Question 2

List the purposes of threads.

Answer 2

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Question 3

Define the following:

- external threads

Answer 3

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Question 4

Define the following:

- internal threads

Answer 4

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Question 5

Define the following:

- pitch

Answer 5

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Question 6

Define the following:

- major diameter

Answer 6

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Question 7

Define the following:

- minor diameter

Answer 7

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Question 8

Define the following:

- nominal diameter

Answer 8

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Question 9

Define the following:

- pitch diameter

Answer 9

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Question 10

Define the following:

- lead

Answer 10

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Question 11

Define the following:

- crest

Answer 11

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Question 12

Define the following:

- root

Answer 12

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Question 13

Define the following:

- side or flank

Answer 13

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Question 14

Define the following:

- single depth of thread

Answer 14

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Question 15

Define the following:

- thickness of thread

Answer 15

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Question 16

Define the following:

- fit

Answer 16

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Question 17

Define the following:

- tolerance

Answer 17

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Question 18

Define the following:

- allowance

Answer 18

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Question 19

Define the following:

- thread angle

Answer 19

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Question 20

Define the following:

- helix angle

Answer 20

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Question 21

How are right-hand and left-hand threads identified?

Answer 21

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Question 22

Name one application for left-hand threads.

Answer 22

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Question 23

What is the purpose of using multiple threads?

Answer 23

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Question 24

What does the nominal size of a threaded fastener refer to?

Answer 24

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Question 25

How is the fasteners load distributed on the threads of the nut?

Answer 25

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Question 26

Define the following:

1/2” - 13 UNC - 2A x 1” lg

Answer 26

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Question 27

Describe a class 3 thread fit.

Answer 27

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Question 28

How does a millwright identify the thread form on a bolt?

Answer 28

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Question 29

Compare American National Threads to Unified Screw Threads in all designations

Answer 29

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Question 30

Describe the constant pitch series threads and state their applications

Answer 30

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Question 31

Describe Acme Threads and state their applications.

Answer 31

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Question 32

Describe National Pipe Taper (NPT) Threads and American dry-seal threads and state their applications.

Answer 32

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Question 33

Describe ISO metric series threads.

Answer 33

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Question 34

Describe the following fastener:

M10 x 1.50 x 60mm

Answer 34

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Question 35

How many threads per inch on a 5/8” UNC bolt?

Answer 35

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Question 36

Do 1” adjustable pipe dies cut proper threads on 2” pipe?

Answer 36

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Question 37

Define:

- bolt

Answer 37

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Question 38

Define:

- cap screw

Answer 38

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Question 39

Define:

- stud

Answer 39

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Question 40

How are bolts, nuts and cap screws classified?

Answer 40

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Question 41

What is the tensile strength of:

- a grade 5 bolt?

Answer 41

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Question 42

What is the tensile strength of:

- a socket head cap screw?

Answer 42

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Question 43

What is the tensile strength of:
- an ISO 4762 class 8.8 cap screw?

Answer 43

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Question 44

What is the purpose of the different head designs for bolts and cap screws?

Answer 44

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Question 45

Describe the nut designs available.

Answer 45

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Question 46

How are nut sizes identified?

Answer 46

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Question 47

What is the major diameter and threads per inch of #10 - 32 machine screw?

Answer 47

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Question 48

Describe the applications for self-tapping and self-drilling, self-tapping machine screw?

Answer 48

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Question 49

What are the purposes of flat washers and how are sizes identified?

Answer 49

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Question 50

Describe locking-type washers

Answer 50

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Question 51

Describe the applications for:

- cotter pins

Answer 51

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Question 52

Describe the applications for:

- headed pins (clevis pin)

Answer 52

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Question 53

Describe the applications for:

- taper pins

Answer 53

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Question 54

Describe the applications for:

- dowel pins

Answer 54

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Question 55

Describe the applications for:

- shear pins

Answer 55

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Question 56

Describe the applications for:

- spring pins and roll (coiled) pins

Answer 56

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Question 57

Describe the applications for:

- grooved pins

Answer 57

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Question 58

Describe the applications for:

- convenience pins

Answer 58

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Question 59

What are the applications for taper, plug and bottoming taps?

Answer 59

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Question 60

Why are tap wrenches beneficial?

Answer 60

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Question 61

How is tap drill size determined? (3 methods)

Answer 61

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Question 62

Why is it important to have a sharp tap?

Answer 62

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Question 63

Describe the process of tapping a hole.

Answer 63

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Question 64

Describe three methods used to remove a broken tap.

Answer 64

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Question 65

Describe the dies and die stocks used for external threads

Answer 65

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Question 66

How is the work prepared for external thread cutting.

Answer 66

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Question 67

Describe the process of cutting external threads

Answer 67

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Question 68

How is slight damage of threads repaired?

Answer 68

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Question 69

Describe four methods used to restore severely damaged internal threads

Answer 69

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Question 70

How are tight and rusted studs removed?

Answer 70

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Question 71

Describe how studs are removed if broken above threaded surface

Answer 71

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Question 72

Describe how studs are removed if broken flush or below threaded surface

Answer 72

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Question 73

How can threaded fasteners fail during installation?

Answer 73

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Question 74

How are threaded fastener failures avoided?

Answer 74

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Question 75

Define:

- elastic limit

Answer 75

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Question 76

Define:

- yield point

Answer 76

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Question 77

Define:

- ultimate tensile strength (uts)

Answer 77

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Question 78

What are the reasons for preloading?

Answer 78

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Question 79

Describe the following:

- preload indicating washers

Answer 79

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Question 80

Describe the following:

- preload indicating bolts

Answer 80

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Question 81

Describe the following:

- torque nuts and torque bolts

Answer 81

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Question 82

Describe the following:

- measured elongation of fasteners

Answer 82

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Question 83

Describe the following:

- turn of the nut

Answer 83

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Question 84

Describe:

- torque-limiting wrench

Answer 84

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Question 85

Describe:

- dial-indicating torque wrench

Answer 85

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Question 86

Describe:

- deflecting-beam torque wrench

Answer 86

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Question 87

Describe:

- torque multiplier

Answer 87

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Question 88

Describe:

- hydraulic torque wrenches

Answer 88

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Question 89

Describe:

- using adapters

Answer 89

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Question 90

What are the purposes of the torque values shown in service manuals?

Answer 90

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Question 91

What does correct torque value depend upon?

Answer 91

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Question 92

What effect does lubrication have on torque values?

Answer 92

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Question 93

What is the recommended torque in ft.lbf for a grade 8 bolt 3/4-16 in an oiled condition?

Answer 93

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