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Mod 6: Materials & Hardware > 6.5.2 Bolts, Studs and Screws > Flashcards

6.5.2 Bolts, Studs and Screws Flashcards

1
Q

What is meant by the grip length of a bolt and what is it measured in under the imperial system?

A

The grip length is the unthreaded portion of the bolt.

Measured in 1/16 ‘’ BAC

or 1/8 ‘’ AN

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2
Q

What is meant by the diameter of a bolt and what is it measured in under the imperial system?

A

The Diameter is the largest distance of the unthreaded/threaded portion of the bolt.

Measured in 1/8 ‘’ for both BAC and AN

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3
Q

Name two types of anticorrosion treatment used in the manufacture of bolts?

A

Cadmium Plating

Chrome Plating

Anodising

Nitrating

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4
Q

Is a slotted engine nut approved for airframe use?

A

A slotted engine nut is designed for aircraft engine applications and is not approved for airframe use.

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5
Q

What do the following abbreviations represent?

NAS

MS

ASTM

SAE

AN

AS

BAC

A

NAS = National Aerospace Standard

MS = Military Standard

ASTM = American Society for Testing and Materials

SAE = Society of Automotive Engineers

AN = Air force Navy

AS = Aeronautical Standard

BAC = Boeing Aircraft Corporation

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6
Q

Identify the following bolts?

  1. Raised circle on its head:
  2. Double dash on its head:
  3. Single raised dash on its head:
  4. Triangle with an x in the centre:
A
  1. Drilled Hex Head Bolt
  2. Aluminium Alloy (2024 bolt)
  3. AN Standard steel bolt (Corrosion Resistant)
  4. NAS close tolerance bolt
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7
Q

What type of nut would you use to lock a plain nut with?

A

Aircraft check nut ( pal nut / jam nut)

Used to jam against a plain nut to lock it to a bolt so that it will not move.

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8
Q

What class of fit are aircraft screws?

A

Aircraft screws are manufactured with a class 2 (free fit) thread fit for ease of assembly.

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9
Q

What class of fit are aircraft bolts?

A

Aircraft bolts are manufactured in the class 3, medium fit.

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10
Q

What is the main difference between a machine screw and a structural screw?

Are Structural screws threaded their whole length?

A

Structural screws are manufactured from higher strength metals and are used in shear loading only.

Also, structural screws are not threaded their whole length

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11
Q

In fastening devices what are studs?

A

Studs are headless bolts that are threaded for their entire length or at both ends.

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12
Q

What is the name given to the threaded area of a stud installed in the component?

A

Answer unsure.

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13
Q

How long will high temperature self-locking nuts remain serviceable?

A

Once they are not damaged, not melted and retain their locking properties.

They are serviceable.

Self locking nuts remain serviceable as long as it is not possible to turn the nut onto the bolt fully without the use of a spanner.

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14
Q

Above what temperature are low temperature self-locking nuts “fiber type” subject to deterioration.

A

120^C

The plastic inserts may melt above this temp.

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15
Q

Do the threads on a bolt cut or impress themselves against the “fiber type” insert in a locknut?

A

The threads on a bolt impress themselves on a ‘‘fiber type’’ / plastic insert.

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16
Q

12 point head bolts are used normally in what areas of the aircraft?

A

Engines

17
Q

Clevis bolts are used under what type of loads?

A

Used only in shear application

SHould be in same direction as gravity.

18
Q

What does the bolt number represent:

AN4-7A

A

AN - Airforce Navy specifications

4 - diameter in 1/16 ‘’

7 - Shank in 1/8 ‘’

A - Means the shank of the bolt is undrilled

(no letter would mean it is a drilled shank for split pin or locking wire)

19
Q

What is meant by the Recess of a bolt?

A

The Recess is the indentation in the head, used in the identification or to drive the bolt.

20
Q

Identify the following bolt:

A

AN Standard Steel Bolt (Corrosion Resistant)

21
Q

Identify the following bolts:

A

Left to right:

AN Standard Steel Bolt

AN Standard Steel Bolt

Special bolt

22
Q

Identify the following bolts:

A

Ledt to rigth

NAS close tolerance bolt

Aluminium Alloy (2024) bolt

23
Q

Identify the following bolt:

A

Magnetically inspected

24
Q

Identify the following bolt:

A

Reworked Bolt

25
Q

What does an aircraft plain nut do?

A

Has no means of positively locking it to the bolt so it must be used with either a lock nut or a check nut.

26
Q

What are the different classes of fit?

A

Class 1 = Loose fit

Class 2 = Free fit ( Aircraft screws)

Class 3 = Medium fit ( Aircraft bolts)

Class 4 = close fit

27
Q

What are the uses of Machine Screws?

A

Machine Screws are generally used in non-structural applications and are threaded for their full length.

Class 2 fit.

28
Q

In fastening devices what are studs?

A

Studs are headless bolts that are threaded for their entire length or at both ends.

29
Q

What is the general guide in terms of nuts and how far onto bolts they should go?

A

As a general guide, 2.5 threads should be shown after the nut has been tightened onto a bolt.

(Always refer to the applicable and current aircraft manual for official guidelines)

30
Q

When is a wing nut used?

A

A wing nut is used on a component that is removed frequently.

31
Q

What are the 3 basic types of screws used in aviation?

A

Machine Screw

Structural Screw

Self-tapping screw

32
Q

What are the two basic types of self tapping screws?

Type of fit?

A
  1. Type ‘A’ has a sharp point or gimlet and course threads
  2. Type ‘B’ has a blunt point and a finer thread than the type ‘A’

Self tapping screws are a class 2 fit?

33
Q

What angle are all countersunk holes at in aviation?

A

100 degrees

34
Q

What is a caution with self tapping screws?

A
35
Q

What is a hexagon Head bolt?

A

A hexagon head bolt is an all-purpose structural bolt used in general application involving tensile and shear loads.

36
Q

When is a countersunk Head bolt used?

A

Used in a bolted joint that is subjected to severe loads reversals and vibrations.

37
Q

What are the following indications on bolt heads (Recess)?

Cross or Asterik

Single dash

Two dashes

A triangle surrounding the cross or asterik

No marking on the bolt head

A

Nickel Steel

Corrosion resistant steel bolt

Aluminium Alloy

A close tolerance bolt

Low strength bolt (not approved for aircraft use)

38
Q
A

Mod 6: Materials & Hardware (18 decks)

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