Fasteners - Bolts, Studs And Screws

Question 1

What is the nominal length of a UNF bolt?

Answer 1

Under head to screw threads ( i.e. plain shank)

Question 2

Where should you not use a nyloc nut?

Answer 2

Temperatures above 120 degrees C

Question 3

What is the nominal length of a standard screw or bolt?

Answer 3

The overall length of a countersunk screw and the non-threaded portion of a bolt

Question 4

An AN steel bolt is identified by what marking on the head?

Answer 4

An ‘x’

Question 5

A blind fastener described as external sleeve and internally threaded would be

Answer 5

A jo bolt

Question 6

Studs which have a size larger thread at one end are called

Answer 6

Stepped studs

Question 7

A bolt win a raised dash is

Answer 7

Corrosion resistant steel

Question 8

A dowel will take what loads?

Answer 8

Shear

Question 9

Dzuz fasteners provide

Answer 9

Quick release fasteners at inspection panels

Question 10

The initials U.N.C when related to aircraft bolts stands for

Answer 10

Unified national course

Question 11

A bolt part number AN25C15 when compared to a bolt part number AN 25-15 has

Answer 11

A higher resistance to corrosion

Question 12

An aluminium alloy bolt may be identified by

Answer 12

It’s colour (dyed black)

Question 13

An AN steel bolt is identified by

Answer 13

X on head

Question 14

Rivnuts were originally used for

Answer 14

Securing rubber de-icing boots

Question 15

Fork end fittings on control rod ends should have

Answer 15

Bolt heads fitted upwards

Question 16

A pin in a fork end fitting is subjected to what loading?

Answer 16

Shear

Question 17

UNF means

Answer 17

Unified fine

Question 18

A clevis bolt in a control cable fork end would be loaded in

Answer 18

Shear

Question 19

Threaded rivets (Rivnuts) are commonly used to

Answer 19

Attach parts or components with screws to sheet metal

Question 20

Aircraft bolts with a cross or asterisk marked on the bolt head are

Answer 20

A standard steel bolt

Question 21

A bolt with a single dash on the head is classified as an

Answer 21

AN corrosion resistant steel bolt

Question 22

A bolt with an ‘x’ inside a triangle on the head is classified as an

Answer 22

NAS close tolerance bolt

Question 23

Aircraft bolts are usually manufactured with a

Answer 23

Class 3 fit for the threads

Question 24

Instrument mounting nuts are

Answer 24

Prevented from dropping behind the instrument panel by magnetism
OR
Non-magnetic

Question 25

The length of a clevis bolt

Answer 25

Includes the threads but not the head

Question 26

When fitting hylocks

Answer 26

Each hylock should be torqued, the torque calculated for each time
OR
The hole should be drilled so it is an interference fit