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threaded and non threaded fasteners > threaded fasteners and locking devices > Flashcards

threaded fasteners and locking devices Flashcards

1
Q

what is a bolt

A

is a fastener used with a nut

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2
Q

what is a screw

A

threads into a mating part

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3
Q

the term threaded fasteners include

A

bolts
nuts
screws
studs
threaded inserts

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4
Q

machine bolts are what diameter

A

1/4 inch to 1 1/2 inch

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5
Q

machine bolt shanks are usually slightly larger than what

A

the nominal size of the bolt

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6
Q

what are cap screws made of

A

high tensile steel

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7
Q

what are the markings on the top of a hex head used for

A

indicate tensile strength

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8
Q

nuts are sized according to what

A

bolt thread size

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9
Q

two properties of nuts

A

nut height
wall thickness

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10
Q

lock nuts with radially cut notches are used for what

A

bearing assembly with tab washers and tapered sleeves to locate bearings on shafts

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11
Q

what kind of screws are less than 1/4 inch in diameter and never larger than 3/4 inch

A

machine screw

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12
Q

most machine screw heads are what styles

A

round
flat
oval

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13
Q

standard counter sink angle on a machine screw

A

82 degrees

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14
Q

set screws are commonly used to retain what

A

hub
collar
gear
sleeve

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14
Q

what are studs

A

cylindrical shafts that are threaded on both ends

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15
Q

thread cutting screws are used for what

A

assemble sheet metal
plastics
and soft metals such as brass and aluminum

16
Q

what are the ends call on a stud

A

metal end (threads on workpiece)
nut end (goes through clearance hole in a mating part)

17
Q

two families of self threading screws

A

thread forming screw
thread cutting screw

18
Q

thread forming screws are used for what

A

cut threads in the parent material
aluminum
zinc
steel sheets
cast iron
brass or plastic

19
Q

when using 2 set screws to hold a hub onto a shaft without a keyway they should be at what angle from each other

A

90 degree

20
Q

why are thread forming screws used

A

they are convenient in sheet metal assemblies

21
Q

name two tapered thread forms.

A

national pipe taper
dry seal national pipe taper fuel
American petroleum institute

22
Q

thread comparison gauges use the what as a basis for thread size

A

pitch diameter

22
Q

thread angle from an American national acme thread is what

A

29 degrees

23
Q

classes 2A and 2B are used for what

A

general purpose

24
Q

what is pitch diameter

A

is diameter at which the thread thickness equals the thickness of the space between threads

25
Q

classes 3A and 3B are used for what

A

aerospace and precision tool application

26
Q

classes 1A and 1B are used what what

A

where thread parts must be assembled quick and easy

27
Q

the fit of a screw refers to what

A

how much play between mating nuts and bolts.

28
Q
A

threaded and non threaded fasteners (3 decks)

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