Threads

Question 1

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

Answer 1

machine screw thread designation

Question 2

TDS=MD-pitch

Answer 2

tap drill size formula

Question 3

find pitch of imperial thread

Answer 3

1/tpi=pitch for imperial thread

Question 4

nut used when appearances are important

Answer 4

acorn nut

Question 5

nut kept in position using a cotter pin or wire

Answer 5

castellated nut

Question 6

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

Answer 6

hex flange nut

Question 7

nut used with machine screw

Answer 7

square nuts

Question 8

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

Answer 8

prevailing torque lock nuts

Question 9

nut used in application requiring frequent removal and retightening

Answer 9

wing nut

Question 10

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

Answer 10

speed nut

Question 11

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

Answer 11

jam nut

Question 12

nut has a nylon or plastic to keep it tight

Answer 12

nylon lock nut

Question 13

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

Answer 13

hex thick nut

Question 14

nut has a built in external lock washer

Answer 14

flange lock nut

Question 15

nut, very thin used on electrical panel and breaker boxes

Answer 15

panel nut

Question 16

the letter A in regards to unified threads stands for

Answer 16

external threads - bolts

Question 17

the letter B in regards to unified threads stands for

Answer 17

internal threads - nuts

Question 18

class of threads used for general and commercial bolts

Answer 18

2

Question 19

class of threads used for aerospace and precision tools

Answer 19

3

Question 20

class of threads used for there high tolerance for fast assembly

Answer 20

1

Question 21

E-H vs e-h

Answer 21

bolts vs nuts

Question 22

which letter has a larger allowance for nuts and bolts

e or h

Answer 22

E

Question 23

the largest diameter of a screw thread

Answer 23

major diameter

Question 24

the smallest diameter of a screw thread

Answer 24

minor diameter

Question 25

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

Answer 25

pitch diameter

Question 26

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

Answer 26

crest

Question 27

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

Answer 27

root

Question 28

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

Answer 28

pitch

Question 29

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

Answer 29

flank

Question 30

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

Answer 30

lead

Question 31

the included angle between the flanks of a thread

Answer 31

thread angle

Question 32

the thickness of a thread measured at the pitch diameter

Answer 32

thread thickness

Question 33

commercial fasteners all use what thread form angle

Answer 33

60 degrees

Question 34

thread form used for precise measuring tools such as micrometers

Answer 34

special 60 fine

Question 35

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

Answer 35

american national acme thread

Question 36

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

Answer 36

brown and worm thread

Question 37

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

Answer 37

buttress thread

Question 38

pipe threads angle is

Answer 38

60 degree

Question 39

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

Answer 39

2H nut

Question 40

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

Answer 40

high nuts

Question 41

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

Answer 41

elastic limit

Question 42

the highest recommended tensile load for that fastener

Answer 42

proof load

Question 43

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

Answer 43

yield point

Question 44

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

Answer 44

shear strength

Question 45

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

Answer 45

toughness

Question 46

the ability of a material to resist penetration

Answer 46

hardness

Question 47

the characteristic of a material to be shaped or moulded easily

Answer 47

malleability

Question 48

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

Answer 48

ductility

Question 49

if a material has the ability to be stretch without deformation

Answer 49

elasticity

Question 50

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

Answer 50

preload

Question 51

Lubricating a nut before installation can reduce tension by how much

Answer 51

7%