Chapter Tests
and Problems
ChaPTer 11 FasTeners and
sPrings TesT
INSTRUCTIONS
Answer the questions with short, complete statements or draw–
ings as needed.
QUESTIONS
Define the screw thread terms given in questions 1 through 11.
1. Axis
2. Classes of threads
3. Fit
4. Die
5. Major diameter
6. Minor diameter
7. Pitch
8. Tap
9. Tap drill
10. Thread
11. Threads per inch
12. Name and describe three types of taps.
13. Name the three methods of thread representation.
14. What thread representation is most commonly used and
why?
15. Why is it common, when possible, to drill deeper than the
intended depth of the tap?
16. Why should an internal tap be deeper than the fastener
thread?
17. Identify the components of the following metric thread note.
M 2.5 3 0.45 2 6g
18. Identify the components of the following unified screw
thread note.
7/8 2 14 UNF 2 2 B
19. When is the abbreviation LH used at the end of a thread
note?
20. What assumption is made about the thread if LH is not
placed at the end of the thread note?
21. Identify two functions of thread inserts.
22. What are set screws used for?
23. What type of information is required to completely identify
a bolt or screw?
24. Identify two applications for taper pins.
25. Identify two applications for washers.
26. What are retaining rings used for?
27. What is the principal application for keys?
28. How are standard key sizes determined?
29. Define keyseat.
30. What are rivets used for, and how are they applied?
31. Standard thread forming tools generally have lead in cham–
fers that produce how many incomplete threads on the
leading edge of the tool?
32. Define runout.
33. Give two problems that can occur when designing fea–
tures that do not provide enough allowance for runout or
sufficient room for the tool.
34. Define blind hole.
35. Give three reasons why through threaded holes are pre-
ferred over blind threaded holes from a manufacturing
standpoint.
36. Taper taps generally have how many lead in chamfers?
37. Bottoming taps generally have how many lead in chamfers?
38. Plug taps generally have how many lead in chamfers?
39. Name the type of tap that is the most commonly used pro-
duction tool for thread forming.
40. Give the minimum formula that you would use when deter–
mining pilot hole depth.
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41. According to ASME Y14.6, what is the general guideline for
the dimension specified on a drawing for thread depth in a
blind hole?
42. What does a thread chamfer or countersink in the pilot hole
help prevent?
43. Give the specifi cations for a reasonable chamfer or counter–
sink on the pilot hole.
44. Give the general rule that can be used when designing the
minimum tool runout for external threads.
45. External threads should have a lead in chamfer for tooling.
Give the general guideline for the applied chamfer diameter
for this application.
46. If a relief is used on external threads, the applied relief
diameter should not exceed what specification?
47. Identify the two optional provisions that must be used when
designing a threaded joint with a shoulder.
48. List the three major functions of pipe threads.
49. Give the drawing angle that is recommended for represent-
ing a taper pipe thread.
50. Define self-clinching fastener.
51. Define spring and give the basic design principle.
52. Identify at least three design criteria used in spring design.
53. Describe spring index and explain what the spring index is
a factor in determining.
54. Identify at least one design factor related to helix direction.
55. Define coil related to spring terminology, and identify active
coils and total coils.
56. Describe deflection related to a compression spring and an
extension spring.
57. What is helix direction, and how is helix direction
specified?
58. Define spring pitch.
59. Give the basic function of a torsion spring.
60. Describe a flat spring and give at least one use for a flat
spring.
61. Give another name for wave springs, and describe the ad-
vantage of using wave springs rather than coil springs.
62. Identify and name the national standard that provides de-
tailed descriptions, drafting practices, and examples of
most common springs used in manufacturing.
63. No matter which spring representation method is used,
several important specifications must accompany the
spring drawing. What is this information or specification
called, and how is it placed on the drawing? List at least
eight items that are included.
64. Briefly explain the application of phantom lines used
when drawing a detailed thread representation. Phantom
lines can be used to simplify the drafting of repeated
detail.
65. Discuss why the schematic spring representation is not as
commonly used as the detailed spring representation.
ChaPTer 11 FasTeners
andsP
d
59728_ch11_EOC_ptg01.indd 2 03/02/16 10:27 am
Chapter 11
Fasteners and Springs
Answers to End-of-Chapter Test Questions
47
48
49
50