Fasteners - Bolts, Studs And Screws Flashcards
What is the nominal length of a UNF bolt?
Under head to screw threads ( i.e. plain shank)
Where should you not use a nyloc nut?
Temperatures above 120 degrees C
What is the nominal length of a standard screw or bolt?
The overall length of a countersunk screw and the non-threaded portion of a bolt
An AN steel bolt is identified by what marking on the head?
An ‘x’
A blind fastener described as external sleeve and internally threaded would be
A jo bolt
Studs which have a size larger thread at one end are called
Stepped studs
A bolt win a raised dash is
Corrosion resistant steel
A dowel will take what loads?
Shear
Dzuz fasteners provide
Quick release fasteners at inspection panels
The initials U.N.C when related to aircraft bolts stands for
Unified national course
A bolt part number AN25C15 when compared to a bolt part number AN 25-15 has
A higher resistance to corrosion
An aluminium alloy bolt may be identified by
It’s colour (dyed black)
An AN steel bolt is identified by
X on head
Rivnuts were originally used for
Securing rubber de-icing boots
Fork end fittings on control rod ends should have
Bolt heads fitted upwards
A pin in a fork end fitting is subjected to what loading?
Shear
UNF means
Unified fine
A clevis bolt in a control cable fork end would be loaded in
Shear
Threaded rivets (Rivnuts) are commonly used to
Attach parts or components with screws to sheet metal
Aircraft bolts with a cross or asterisk marked on the bolt head are
A standard steel bolt
A bolt with a single dash on the head is classified as an
AN corrosion resistant steel bolt
A bolt with an ‘x’ inside a triangle on the head is classified as an
NAS close tolerance bolt
Aircraft bolts are usually manufactured with a
Class 3 fit for the threads
Instrument mounting nuts are
Prevented from dropping behind the instrument panel by magnetism
OR
Non-magnetic
The length of a clevis bolt
Includes the threads but not the head
When fitting hylocks
Each hylock should be torqued, the torque calculated for each time
OR
The hole should be drilled so it is an interference fit
