Hardware, Fasteners, Drills,

1
Hardware, Fasteners, Drills, Thread Repair

• Chapter 6
• Page 53

2
Cool Facts

• Bolts Cap Screws
• UNF Unified National Fine (fine thread)
• UNC Unified National Course (course thread)
• Temper Metal is heated and quenched (cooled in
  water or oil) for extra strength
• Clamping Force This is how the bolt holds in or
  parts together (not the threads)
• Tensile Strength Maximum limit before breaking

3
Types of Fasteners
4
Bolt Grades
Weaker Cheaper
Harder More
U.S
6
8
5
2
The higher the numbers - The higher the tensile
strength
Metric
4.6
5.8
8.8
10.9
Dont forget to use the same grade nut with the
bolt/Oh yea, the nut has a grade system too!
5
Thread Lubricant and Locks

• Antiseize lube that keep the threads from
  rusting
• Oil
• Grease
• Be careful not to use too much,
  hydro-lock can happen
• Thread lock
• Red Permanent
• Blue Semi Permanent

6
Removing Studs
7
Drill Bits

• Used to make new holes, bigger holes, or to
  repair threaded holes (with taps).

8
Screw Extractors
9
Thread Measuring
10
Thread Making and Restoring
11
Taps
12
Thread Inserts

• Drill an oversized hole
• Tap the hole
• Apply loctite to insert
• Screw insert in with mandrel

13
Dies
14
Torque Sequence
You will find the sequence in the shop manual
15
(No Transcript)
16
Your Job.

• Complete chapter Questions 1-10 (review) and 1-5
  (ASE-style). Page 66.
• Write on a separate paper and write out the
  complete question and your answer. ( do not write
  the other answer options).
• Complete the chapter worksheet (I will give it
  out). You may write on it.
• File these items in your note book.
• Notebooks will be graded in the future.