M6.5 Fastners Flashcards by Meg Bazeley

How can you measure the screw pitch

By using a screw thread pitch gauge

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What does class 1 mean

Loose fit

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What does class 2 mean

Free fit

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What does class 3 mean

Medium fit

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What does class 4 mean

Close fit

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What does class 5 mean

Tight fit

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Whose mum is class 1 fit

Lewis’s mum cus she’s a loose fit

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What class are aircraft screws normally in

Class 2

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What is the maximum temperature low temperature locking nuts can withstand?

121 degrees

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What is the crest on a screw

The prominent point of the thread

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What is the temperature high temperature self locking nuts will act at?

121 degrees plus

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What is the root of a screw

Bottom point of the thread groove

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Where are slotted engine nuts used?

Engine only

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What is a flank on a screw

The angle of the slope between the root and crest

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What are anchor nuts used for?

Pannels regularly removed

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Where are tinerman nuts used?

Any area which chance of magnetic interference

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What is a stud (don’t say megs dad)

Shaft threaded on both ends

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What is a thread angle

Angle between two crests

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Describe a standard stud thread

Same throughout

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Describe a waisted stud thread

Threaded each end, strength is retained, weight saved

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What is the major diameter (screws) on a male and female

Crest to crest on male
Root to root female

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Describe a stepped studs thread

Provide a stronger anchorage when used for softer material

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Describe a shouldered stud thread

used when rigidity is required lateral stress

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What are the 3 ways stud insertion are removed?

. Stud box
. Stud insertion tool
. Lock nuts

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What is a heat coil insert and what does it do?

. Repairs stripped thread . Must be 1/2 pitch below surface

What is a minor diameter (screws) on male and female

Root to root on male Crest to crest on female

Name the 3 types of screw and describe them

. Machine screws - most common, structural parts, fairings . Structural screws - same bolt strength, can be heat treated . Self tapping screws - light weight material only, thin metal sheets

What is a pitch (screw)

The distance of one revolution

What are dowels?

Provide precision to alignment

What does BSW

British standard Whitworth

What does BSF stand for

British standard fine

What does BSP stand for

British standard pipe

What are the thread angles of BSW, BSF, BSP

55^

When would you use BSF

When part is subject to vibration

What does BA stand for

British association

What is the Thread angle of BA and the diameter

47.5^ Less than 1/4” diameter

What does ANC and ANF stand for

American national coarse - flat crest and root American national fine

What the “x” indicate on top of a bolt

That it’s a steel bolt

What thread angle is ANC and ANF

60^

What type of thread profile only travels in one direction

Buttress

What is the thread angle for United national coarse, fine and extra fine

60^

What are the three bolt profiles

Acme Buttress Square

What are the two types of threads

Course and fine

What the thread angle of a unified National threads?

60 degrees

What’s the thread angle of American thread forms

60 degrees

Which one out the British thread forms has a different thread angle and what is that angle

Ba and 47.5

What’s the thread angle of British thread forms

55 degrees

What’s the major and minor diameter of a female thread

Minor- crest to crest Major- root to root

What’s the major and minor diameters of a male thread

Major- crest to crest Minor- root to root

What is a square thread profile used for

Ideal for power transmission

What’s the crest, root and flank of screw

Crest is the prominent point Root is the lowest point Flank is the angle of the slope

What do the 5 classes mean

1 is loose 2 is free 3 is medium 4 is close 5 is tight

What’s used to measure a thread pitch

Thread pitch gauge

What is an advantage of ACME thread profile

Stronger than square

What is Butress thread profile used for

For handling heavy forces, can only travel in one direction

What are close tolerance bolts used for

When subjected to pounding loads

When are eyebolts used

When subjected to tension loads

What does H mean on a Bolt

A Drilled head

When are Clovis bolts used

When subjected to shear loads

What does the double dash on a bolt head mean

That it’s made from aluminium

What’s the triangle on a bolt head mean

That it’s close tolerance

What’s a single dash mean on a bolt head mean

That it’s made from CRES metal (corrosion resistant)

What are the two different types of nuts

Self locking Non self locking

What does the cross mean in material identification?

Steel

What does a line in the bottom left corner mean in material identification?

Corrosion resistant steel

What does two lines mean in material identification?

Aluminium

what temp do low temperature self locking nuts operate at

121 degrees max

What does A mean when on a bolt

Drilled hole need to check

What does it mean if there’s a triangle when identifying materials?

Close tolerance

What is a Clevis bolt and when is it used

Round snapped head Only used when load applied is shear

What’s the difference between the materials in a low temp self locking nuts vs a high temp self locking nut

Nylon insert in low temp High temps made from same metal

When is an eye bolt used

Where external load tension applied

What is a drilled head engine bolt and when is it used

Have a thick head that has small holes in each of the flats and centre of the head Only used in engine

What’s the difference between a slotted engine nut and a castle nut

Slotted engine nuts can only be used on engine whereas castle nuts can be used on structure

What is a close tolerance bolts and when are they used

Used in areas subject to pounding or where load is required to be riveted and bolted Identified by triangle mark on their heads

What’s the reason for using waisted studs

Used for when weight saving is needed

What’s the reason for using shouldered studs

Gives lateral stability

When is an internal wrench bolt used

High tensile steel bolts Used for high tensile strength Spreads stress out

What is precision airframe bolts and when is it used

Grap length = 1/16 inch increments Used if standard ms bolt is either too long or too short

Why are hell coil inserts used

Used when the thread has worn away to replace previous threads