6.5 - Fasteners Flashcards
For the different features of a screw, look at page 231 and 233 cuz I can’t be arsed to make questions for all of them.
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When the lead and the pitch of a thread are equal, how many starts are there?
1 start (single start thread).
How much further will a double-start thread travel in comparison to a single-start thread in each full turn?
Twice as far.
List the British Standard thread forms and what their basic uses are.
BSW(British Standard Whitworth) - general purpose work
BSF(British Standard Fine) - finer version of the BSW, better against vibration
BSP(British Standard Pipe) - finer version of BSW, used for pipeline fittings
BA(British Association) - small mech/elec parts on aircraft
How are British Standard thread forms numbered?
1 to 10, the smaller the number, the larger the thread.
What is the thread angle of BS(British Standard)?
55 deg
What is the thread angle of BA(British Association)?
47.5 deg
What are the two AN(American National) thread forms and what are their thread angles?
ANC(American National Course)
ANF(American National Fine)
Both thread angles are 60 deg
What are the three Unified Thread forms and what is the thread angle for each?
UNC(Unified National Coarse)
UNF(Unified National Fine)
UNEF(Unified National Extra Fine)
All have a thread angle of 60 deg
What is the main factor which determines the thread profile?
The job that the screw is intended to do.
Look at page 244/245 for screw ident cuz I can’t be arsed to ask any questions about it
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Name the 4 different types of studs
Standard
Waisted
Stepped
Shouldered
What are the two methods of stud removal
Filed flats
Ezi-Out
At what temp must high temp self-locking nuts be used?
120 deg
What is a spring washer?
The spring is compressed when the nut is tightened, creating friction between threads.
What must you NOT do with a tab washer?
Straighten the tabs and re-use the washer
What is the 1100 rivet material letter code, head mark, and does it need heat treatment?
A
No mark
No heat treatment
What is the 2117 rivet material letter code, head mark, and does it need heat treatment?
AD
Dimpled
No heat treatment
What is the 2017 rivet material letter code, head mark, and does it need heat treatment?
D
Teat
No heat treatment
What is the 2024 rivet material letter code, head mark, and does it need heat treatment?
DD
Raised double dash
Yes, solution heat treat
What is the 5056 rivet material letter code, head mark, and does it need heat treatment?
B
Raised cross
No heat treatment
What size is a red hi-lok collar?
Standard and 1/64” oversize
What size is a blue hi-lok collar?
1/32” oversize
What size is a black hi-lok collar?
3/64” oversize
What is a Taper-Lok?
A tapered bolt with a self-locking nut on the opposite end.
What are the three types on Cherrylock rivet?
Standard
Bulbed
Oversize
What must never be done to an Olympic-Lok rivet after installation?
Never file the stem as it will weaken the mechanical lock.
