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Millwright Level 1 > Threads > Flashcards

Threads Flashcards

1
Q

(OD)=(size# x .013)+.060

A

machine screw thread designation

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2
Q

TDS=MD-pitch

A

tap drill size formula

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3
Q

find pitch of imperial thread

A

1/tpi=pitch for imperial thread

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4
Q

nut used when appearances are important

A

acorn nut

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5
Q

nut kept in position using a cotter pin or wire

A

castellated nut

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6
Q

nut used to spread the clamping pressures over a greater area of the workpiece

A

hex flange nut

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7
Q

nut used with machine screw

A

square nuts

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8
Q

nut have a deformed or crimped thread at the top of the crown that provides the locking force against the mating thread

A

prevailing torque lock nuts

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9
Q

nut used in application requiring frequent removal and retightening

A

wing nut

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10
Q

nut used in light application, the spring action of the two ridges provides a modest locking force

A

speed nut

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11
Q

nut thinner than hex nut, paired with hex nut to lock into place

A

jam nut

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12
Q

nut has a nylon or plastic to keep it tight

A

nylon lock nut

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13
Q

nut used when high preloads are required and where dialation of the nut must be prevented

A

hex thick nut

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14
Q

nut has a built in external lock washer

A

flange lock nut

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15
Q

nut, very thin used on electrical panel and breaker boxes

A

panel nut

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16
Q

the letter A in regards to unified threads stands for

A

external threads - bolts

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17
Q

the letter B in regards to unified threads stands for

A

internal threads - nuts

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18
Q

class of threads used for general and commercial bolts

A

2

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19
Q

class of threads used for aerospace and precision tools

A

3

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20
Q

class of threads used for there high tolerance for fast assembly

A

1

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21
Q

E-H vs e-h

A

bolts vs nuts

22
Q

which letter has a larger allowance for nuts and bolts

e or h

A

E

23
Q

the largest diameter of a screw thread

A

major diameter

24
Q

the smallest diameter of a screw thread

A

minor diameter

25
Q

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

A

pitch diameter

26
Q

at the top of the helical ridge known as the major diameter

A

crest

27
Q

at the bottom of the space between the threads known as the minor diameter

A

root

28
Q

the distance from one point on one thread to the same point on the next thread

A

pitch

29
Q

the angled side of a thread connecting the crest and the root

A

flank

30
Q

the axial distance a nut advances on a screw thread after one complete turn

A

lead

31
Q

the included angle between the flanks of a thread

A

thread angle

32
Q

the thickness of a thread measured at the pitch diameter

A

thread thickness

33
Q

commercial fasteners all use what thread form angle

A

60 degrees

34
Q

thread form used for precise measuring tools such as micrometers

A

special 60 fine

35
Q

thread form is standard use for transmitting power and motion in machinery, has a 29 degree thread angle and root and crest are flat

A

american national acme thread

36
Q

thread form used as a driver for gears to transmit angular motion, has a 29 degree thread angle, has a narrow root and crest

A

brown and worm thread

37
Q

thread form used in applications involving exceptionally high stresses in one direction, has a pressure flank at 90 degree to the thread axis and a 45 degree clearance flank

A

buttress thread

38
Q

pipe threads angle is

A

60 degree

39
Q

nut used for stability in high temperature applications and with high strength structural bolts

A

2H nut

40
Q

nuts used for shackles, u bolts, these nuts are furnished only with fine threads and hardened

A

high nuts

41
Q

the maximum tension that an object can sustain and still return to its original shape and be fully fuctional

A

elastic limit

42
Q

the highest recommended tensile load for that fastener

A

proof load

43
Q

the point which a fastener suffers permanent deformation when a tensile load is applied

A

yield point

44
Q

the amount of continuous shear force that a fastener can withstand before breaking

A

shear strength

45
Q

resistance to fracture or the amount of energy a substance absorbs before it breaks

A

toughness

46
Q

the ability of a material to resist penetration

A

hardness

47
Q

the characteristic of a material to be shaped or moulded easily

A

malleability

48
Q

how much a material can be deformed or drawn before it breaks

A

ductility

49
Q

if a material has the ability to be stretch without deformation

A

elasticity

50
Q

lubricating a fasteners increases the amount of _____ when torquing to the same settings

A

preload

51
Q

Lubricating a nut before installation can reduce tension by how much

A

7%

Millwright Level 1 (17 decks)

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