M6 Day 2
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- Created by: astonjmky
- Created on: 16-03-22 16:16
What direction does the thread go on a left hand screw?
Anti clockwise
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A clockwise thread direction means it is a what hand screw
Right hand
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What is the lead on a screw
The distance moved in 1 turn
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The female thread is
An internal thread
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An external thread is
male
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A 4 start has a lead what times the pitch?
4 X the pitch. A 2 start has a lead 2 x the pitch.
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What is the pitch?
The angle from crest to crest
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What are the british standard thread forms
British Standard Whitworth (BSW)
British Standard Fine (BSF)
British Standard Pipe (BSP)
British Assosciation (BA)
British Standard Fine (BSF)
British Standard Pipe (BSP)
British Assosciation (BA)
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What are the american thread forms
ANC & ANF
(American national Coarse & American national Fine)
(American national Coarse & American national Fine)
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Unified Thread Forms
UNC, UNF, UNEF
(United national coarse
United National Fine
United National Extra fine)
(United national coarse
United National Fine
United National Extra fine)
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What is British Association diameter below?
1/4" Diameter
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What is the thread angle of BSW & BSF
55 degrees
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What is the thread angle of BA
47.5 degrees
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What is the thread angle of ANC & ANF
60 degrees
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What is the thread angle of all unified threads?
60 degrees
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How can you identify unified screws?
They have markings to identify
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What are the markings on a unified screw?
3 circles
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How can you determine the pitch of a thread?
With screw pitch guages
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What are the three specialist threads?
Square, Buttress, Acme
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Which specialist thread can only transmit load in 1 direction?
Buttress
20 of 110
How is a bolt tightened?
with a nut
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What should be done when installing a bolt?
Install so if loose, they remain in head upwards, in direction of rotation.
22 of 110
How is a nut installed so that it is in safety?
Install the nut so that less than 1/32" of thread is showing.
So that if bolt/nut starts to undo it is still engaged with thread.
So that if bolt/nut starts to undo it is still engaged with thread.
23 of 110
What should be done if the bolt is chamfered?
The whole chamfer must extend through the nut
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What should all fasteners have done to them?
Torqued to the correct value according to SRM
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How are bolts identified?
With a marking on the head
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How are steel bolts identified?
With an 'X' On the head
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How are Steel, close tolerance bolts marked?
With a triangle with an 'X' inside it on the head of the bolt
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How are CRS bolts marked?
With a '-' on the head
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How are CRS, Close tolerance bolts marked?
With a single '-' and a triangle on the head
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How are Aluminium bolts identified?
With 2 '-' on the head
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How are Aluminium alloy, close tolerance bolts identified?
With a '-' followed by a triangle, followed by another '-' on the head of the bolkt.
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On a bolt, the length extends from where to where?
The bottom of the head to the shank
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Where are all bolts and screws identified?
in the IPC - Illustrated parts catalogue
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What is the grip length?
The material thickness
35 of 110
When the total material thickness is less than 2.4mm, what is allowed in regards to threads?
When less than 2.4mm, No pitch threads are allowed in the material
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When over 2.4mm material thickness, how many pitch threads are allowed in the material?
2 pitch threads.
37 of 110
What is the maximum amount of washers that can be used?
3
38 of 110
What are the 4 types of studs?
Standard, Waisted, Stepped, Shouldered
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What is a stud?
A piece of rod with thread at each end. Has no head.
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What is the most common stud?
Standard Stud
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What are the 3 methods of fitting studs?
Stud box, Stud insertion tool, and Lock nuts - (two spanners)
42 of 110
How do you remove a broken stud?
Using an ezi out extractor
43 of 110
What does a self tapping screw do?
Cuts its own thread
44 of 110
What are the 3 types of castle nut?
Shear castle nut, castle nut, slotted engine nut
45 of 110
Where is a slotted engine nut used?
In the engine
46 of 110
Characteristic of a wing nut?
Two protruding 'wings' - finger tightened, low torque applications.
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What do most locking nuts use to lock themselves?
Friction
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Characteristics of a Nyloc Stiffnut?
Nylon insert on end. Nylon is compressed when tightened, creating a friction lock.
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What temperature can Nyloc stiffnuts not exceed?
121C
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How does an Oddie stiff nut work?
It has 6 tongues, that, once inserted, push out, preventing it from being extracted.
51 of 110
What do Aerotight and Philidas stiffnuts rely on to self-lock?
Friction
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When is an anchor nut used?
When some play (movement) is required to allow bolt to locate hole.
53 of 110
When would a ***** anchor nut be used?
When a panel with lots of fasteners is used.
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What is the minimum temperature requirement for high temperature self locking nuts?
120C
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What must high temp self locking nuts be made from?
All metal, such as CRES, Steel.
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What is the maximum temperature for a low temperature self locking nut?
121C
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How would you know if a Nyloc Stiffnut is not to be reused?
If they can be run up finger tight.
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What is a helicoil?
A repair that can be used for expensive, damaged thread, or to protect soft material. It is available for all thread types, and has a driving tang.
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What does a helicoil assure?
Assures full load distribution.
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What are the two types of helicoil?
Standard and screw lock.
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What is the difference between Standard and Screw lock helicoils?
Standard has a free running thread, whereas screw lock has an internal locking thread.
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What do helicoils provide stronger than the original?
A stronger thread.
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What type of thread is helicoil used for?
Internal thread.
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What are Cotter (split) pins made from?
Low Carbon steel, CRES
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Where is a split pin measured to?
To the shortest prong
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Why would a CRES Split pin be used?
for non magnetic areas
67 of 110
What is the kind of fit desired when installing a split pin?
A good fit - not loose.
68 of 110
What are the preferred rules when installing split pins?
No overhang, Don't contact washers.
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What does a key do?
Transmits drive, locks shaft to head.
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What is a characteristic of Gib headed keys?
They are removeable.
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What is the taper ratio of a tapered key?
1:100 - for every 100mm along, the key tapers by 1mm
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What are keys made from?
A solid metal piece.
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What loosens fasteners?
Vibrations.
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What is safetying?
Securing Fasteners.
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What is safety wire (locking wire) measured in?
1000ths of an inch. (0.0001)
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What are some of the common methods for safetying?
Wire locking, split pinning, lock washers, lock plates, snap rings (circlips), Self locking nuts.
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How many times can a lock washer be reused?
None, they are a 1x use.
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What are the 2 methods of wirelocking?
Single & Double twist.
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What is the preferred method of wirelocking?
Double.
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Where would we use single twist wirelocking?
Small screws, electrical systems, hard to access areas.
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Where would we find the required twists per inch?
AMM Chapter 20
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What are 3 types of washers?
Spring washers, Tab washers, Shakeproof Washers.
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Characteristics of a spring washer?
Compressed, friction lock.
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Characteristics of a tab washer?
Tabs are bent - 1x use.
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When is a shakeproof washer reusable?
If it has retained it's springiness.
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What are the 2 types of Dzus fastener?
Light duty & Heavy duty.
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What are the characteristics of an 1100 aluminium rivet?
Soft, pure rivet. Low strength. No marking.
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What can be done to 2017, 2117, 7050 rivets?
They can be heat treated.
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What strength are 2017, 2117, and 7050 rivets?
Medium strength
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What is an advantage of Monel rivets?
Heat resistance
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What is an advantage of titanium rivets?
High heat resistance, High strength.
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What is a rivets minimum diameter, usually?
3x thickest sheet thickness.
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What is the standard countersink angle?
100 degrees
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If it is a thick piece of material, what can the countersink angle be?
82 degrees.
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If it is a thin piece of material what can the countersink angle be?
120 degrees.
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What is the marking on a 2017(D) rivet?
a raised dot
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What is the marking on a 2117(AD) rivet?
Small dimple
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What is the marking on a 2024 (DD) rivet?
Two raised dashes
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What is the marking on a 5056 (B) rivet?
A raised cross.
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What does a 5056 (B) rivet prevent?
Dissimilar metal corrosion
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What is the marking on a 7050 (E) rivet?
Corrugated head.
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What marking does a monel rivet (M) have?
2 dimples or a raised 'r'
103 of 110
What are the 2 parts of a Hi-Lok?
Threaded pin with a head, and a collar.
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What are the characteristics of a Hi-lite?
Similar to a Hi-Lok, less material, which saves weight. It is 15% lighter.
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What is the maximum out of parallel angle for CRES collars?
0.5 degrees.
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What is the maximum out of parallel angle for Aluminium alloy collars?
3 degrees.
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What is the taper ratio for a Taper-Lok?
1:48
108 of 110
What do Taper-Loks require?
Special lubricant, and approved operators.
109 of 110
Characteristics of a lock bolt?
Strong, light, two pieces: Pin, collar.
110 of 110
Other cards in this set
Card 2
Front
A clockwise thread direction means it is a what hand screw
Back
Right hand
Card 3
Front
What is the lead on a screw
Back
![Preview of the front of card 3](https://getrevising.co.uk/revision-tests/m6-day-2-1/2/b/preview.png)
Card 4
Front
The female thread is
Back
![Preview of the front of card 4](https://getrevising.co.uk/revision-tests/m6-day-2-1/3/b/preview.png)
Card 5
Front
An external thread is
Back
![Preview of the front of card 5](https://getrevising.co.uk/revision-tests/m6-day-2-1/4/b/preview.png)
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