M6.5pt2 Fasteners Flashcards by Meg Bazeley

What does a spring washer do?

Creates spring compression and a friction lock, cannot be reused

How well did you know this?

Not at all

Perfectly

What does a tab washer do?

Has to be bent over the bolt, cannot reuse

How well did you know this?

Not at all

Perfectly

What is a shake-proof washer?

Sharp edges of a washer dig into material of bolt, can only be reused if the springiness is retained

How well did you know this?

Not at all

Perfectly

What is a lock wire and what does it do?

Single twists and double twists, can only lock a maximum of 3 bolts together, use of different thickness wire to lock in bolts

How well did you know this?

Not at all

Perfectly

What are the 2 lock wiring methods?

. By hand
. Wire locking pliers (twisters)

How well did you know this?

Not at all

Perfectly

What is a locking plate?

. Plate goes over a nut to prevent it loosening
. Reusable

How well did you know this?

Not at all

Perfectly

What is a pal nut?

Spring lock action nut

How well did you know this?

Not at all

Perfectly

How’s spring washers work

A small spring is inserted and causes it to friction lock preventing it to become undone

How well did you know this?

Not at all

Perfectly

How is 1100 aluminium alloy identified

Plan head
the letter A
Low strength rivet, very soft

How well did you know this?

Not at all

Perfectly

What is a quick release faster?

. Fast unlocking
. Vibration resistant

How well did you know this?

Not at all

Perfectly

How do tab washers secure a nut

It’s put in between nut and surface and then the tabs are folded up

How well did you know this?

Not at all

Perfectly

Which one of the washers are reusable

Shake proof

How well did you know this?

Not at all

Perfectly

What’s locking wire made from

Stainless steel and copper

How well did you know this?

Not at all

Perfectly

How is 2117 aluminium alloy identified

A dimple on the head
the letter AD
Medium strength rivet, most used
No heat treatment required (already done)

How well did you know this?

Not at all

Perfectly

What’s the most common quick release fasteners

Dzus

How well did you know this?

Not at all

Perfectly

What are the two types of Dzus and what’s the difference

Light and heavy ( heavy requires a grommet)

How well did you know this?

Not at all

Perfectly

How is 5056 aluminium alloy identified

A cross
the letter B
5% magnesium, Al alloy
Prevent dissimilar metal corrosion
Rivet onto magnesium only

How well did you know this?

Not at all

Perfectly

What is a taper pin?

. Any joint with shear load

How well did you know this?

Not at all

Perfectly

Where would taper pins be used

In a place where a shear loading is applied

How well did you know this?

Not at all

Perfectly

What is a split pin?

. Cadmium plated carbon or cress

How well did you know this?

Not at all

Perfectly

What is the most common key?

Woedruff key

How well did you know this?

Not at all

Perfectly

What are the 2 rivet codes and what do they mean?

426 - countersunk head
470 - universal head

How well did you know this?

Not at all

Perfectly

In a rivet code what does the number before and after the dash mean?

Diameter 1/32 - Length 1/16

How well did you know this?

Not at all

Perfectly

What’s the most common key

Woodruff key

How well did you know this?

Not at all

Perfectly

What type of metal would have to be dimpled instead of countersunk?

Thin metal sheets

What type of nuts are split pins used with

Castlated nuts

What is a 426 rivet

A countersunk rivet

What’s a 470 rivet

Universal head

How is 2017 aluminium alloy identified

A raised dot the letter D Require heat treatment Freezer delays age hardening ‘Ice box rivets’

How is 2024 aluminium alloy identified

Two dashes the letters DD Requires heat treatment Ice box rivets

what do the numbers represent in rivet codes

The 3 digit code- is the head style (470 or 426) The second to last one is the diameter of the rivet (measure in 1/32) The last one is the length of the rivet (measure in 1/16)

what do the numbers represent in rivet codes

The 3 digit code- is the head style (470 or 426) The second to last one is the diameter of the rivet (measure in 1/32) The last one is the length of the rivet (measure in 1/16)

How is 7050 aluminium alloy identified

A raised circle the letter E Harder than 2024 Requires heat treatment

Which type of rivet is most common universal or countersunk

Universal

How is CRES aluminium alloy identified

no markings the letter F Used in firewalls and exhaust

Why are counter rivets more commonly used on aircraft surface instead of universal

Because they’re more aerodynamic

How is Monel aluminium alloy identified

2 : on head the letter M Instead of CRES rivets

How are 1100 rivet aluminium alloys identified

By letter A Have no marking

What is difference between a special rivet to a standard rivet

Special rivets, you only have access to one end of the rivet. More expensive

How are 2117 identified

With letters AD And a dimple in head of rivet

How are 5056 rivets identified

With the letter B And with a cross on the head of the rivet

What are the 4 mechanical lock rivets

Huck lock Cherry lock Olympic lock Cherry max

How are 2017 rivets identified

Identified with the letter D How a dot on the top

How are 2024 aluminium rivets identified

With a DD Has a double dash on rivet head

What lock rivet replaces solid shank rivets

Huck lok

How are CRES rivets identified

With the letter f

What does a cherry lock ensure

The lock rinks endure stem is locked into place Needs a specific tool

What’s the economic advantage of cherry max rivets over cherry lock rivets

Cherry max only requires one size puller for installation of all sizes

What’s the difference between a cherry lock and cherry max

Cherry max, any tool can be used for installation

What is a disadvantage of Olympic lok

Needs specific installation tool

What’s the difference between Hi lok and hi lite fasteners

Hi lite it’s lighter than hi lok

What type of fastener is the strongest

Taper lok

How can you identify different lock bolts

Colour coded

What tools do you use for Hi loks

Allen key or hex drive

Which is the strongest special fastener

Taper lok Also radial compression over shank that evens out stress

How would you remove special fasteners

Turning with wrench and pair of vice grips Or Mallet to tap out remaining faster Or Chisel to split collar

Why is hite lite better than hi lok

15% lighter

What is the angle for AN fitting

37%

What is the angle for AC fittings

35%

What colours would define an AC fitting

Yellow and grey is also shorter than AN

What colours define AN fittings

Blue and black Longer than AC

What are the two types of flareless fittings

MS Harrison

What principle do MS and Harrison fittings follow

Ball bush principle

What is the main advatanage of Harrison

Vibration resistant Simple tooling

How would you identify if a flareless fitting is made out of aluminium alloy

the letter D

How would you identify if a flareless fitting is made out of cadmium plated steel

Non just plain

How would you identify if a flareless fitting is made out of CRES

the letter S

What is a swaged fitting used for

Repairing sleeve

What are the advantages of swaged fittings

Quick In situational

What do flexible fluid lines do

Connect stationary to dynamic

What does the inner layer of a flexible fluid line have to be

Chemically compatible (Teflon) Compatible with nearly all fluid

What are lay lines

Twist indicators (1/16) Prevent hose twisting

What are the pressures for flexible fluid lines

Low - 600psi Medium - up to 3000psi High - above 3000psi

What are the disadvantages of swaged end fittings

Cannot be removed or reused

What are blanking caps used for

Covers end of fitting to prevent fod or cross contamination when changing

When are quick disconnect couplings used

One hand operation to connect and disconnect without need for further equipment, very quick and easy

What is a swivel fitting

Reduce length of hose between connections Eliminate the need for bent tubing