6.5 - Fasteners

Question 1

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.

Answer 1

.

Question 2

When the lead and the pitch of a thread are equal, how many starts are there?

Answer 2

1 start (single start thread).

Question 3

How much further will a double-start thread travel in comparison to a single-start thread in each full turn?

Answer 3

Twice as far.

Question 4

List the British Standard thread forms and what their basic uses are.

Answer 4

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

Question 5

How are British Standard thread forms numbered?

Answer 5

1 to 10, the smaller the number, the larger the thread.

Question 6

What is the thread angle of BS(British Standard)?

Answer 6

55 deg

Question 7

What is the thread angle of BA(British Association)?

Answer 7

47.5 deg

Question 8

What are the two AN(American National) thread forms and what are their thread angles?

Answer 8

ANC(American National Course)

ANF(American National Fine)

Both thread angles are 60 deg

Question 9

What are the three Unified Thread forms and what is the thread angle for each?

Answer 9

UNC(Unified National Coarse)

UNF(Unified National Fine)

UNEF(Unified National Extra Fine)

All have a thread angle of 60 deg

Question 10

What is the main factor which determines the thread profile?

Answer 10

The job that the screw is intended to do.

Question 11

Look at page 244/245 for screw ident cuz I can’t be arsed to ask any questions about it

Answer 11

.

Question 12

Name the 4 different types of studs

Answer 12

Standard
Waisted
Stepped
Shouldered

Question 13

What are the two methods of stud removal

Answer 13

Filed flats

Ezi-Out

Question 14

At what temp must high temp self-locking nuts be used?

Answer 14

120 deg

Question 15

What is a spring washer?

Answer 15

The spring is compressed when the nut is tightened, creating friction between threads.

Question 16

What must you NOT do with a tab washer?

Answer 16

Straighten the tabs and re-use the washer

Question 17

What is the 1100 rivet material letter code, head mark, and does it need heat treatment?

Answer 17

A
No mark
No heat treatment

Question 18

What is the 2117 rivet material letter code, head mark, and does it need heat treatment?

Answer 18

AD
Dimpled
No heat treatment

Question 19

What is the 2017 rivet material letter code, head mark, and does it need heat treatment?

Answer 19

D
Teat
No heat treatment

Question 20

What is the 2024 rivet material letter code, head mark, and does it need heat treatment?

Answer 20

DD
Raised double dash
Yes, solution heat treat

Question 21

What is the 5056 rivet material letter code, head mark, and does it need heat treatment?

Answer 21

B
Raised cross
No heat treatment

Question 22

What size is a red hi-lok collar?

Answer 22

Standard and 1/64” oversize

Question 23

What size is a blue hi-lok collar?

Answer 23

1/32” oversize

Question 24

What size is a black hi-lok collar?

Answer 24

3/64” oversize

Question 25

What is a Taper-Lok?

Answer 25

A tapered bolt with a self-locking nut on the opposite end.

Question 26

What are the three types on Cherrylock rivet?

Answer 26

Standard
Bulbed
Oversize

Question 27

What must never be done to an Olympic-Lok rivet after installation?

Answer 27

Never file the stem as it will weaken the mechanical lock.