Deck 13: Threads, Fasteners, and Springs

Question 1

The first standardize screw thread was accepted in 1841 and was called the:

A) American Standard thread
B) Unified Screw thread
C) Acme
D) Whitworth
E) Sharp V

Answer 1

Whitworth

Question 2

The diameter of an imaginary cylinder passing though the threads to make equal the widths of the threads and the widths of the spaces cut by the cylinder describes:

A) Angle of the thread
B) Major diameter
C) Pitch diameter
D) Minor diameter
E) Lead

Answer 2

Pitch diameter

Question 3

Which of the thread symbols are customarily used for threads under 1"?

A) Schematic, simplified, or detailed
B) Schematic or simplified
C) Schematic or detailed
D) Simplified or detailed
E) Only simplified

Answer 3

Schematic or simplified

Question 4

Which line type may be used to show a repetition of a series of identical features?

A) Object line
B) Hidden line
C) Center line
D) Phantom line
E) Broken line

Question 5

Which of the following is a general-purpose thread for holding purposes, designated NC?

A) Course thread
B) Fine thread
C) 8-pitch thread
D) 12-pitch thread
E) 16-pitch thread

Question 6

In the thread designation, .25-20 UNC-2B LH, what is the meaning of "20"?

A) Major diameter
B) Number of threads per inch
C) Class of fit
D) Internal thread
E) Type of thread

Question 7

Which of the following screw heads is placed flushed with the surface of the material?

A) Round head
B) Fillister head
C) Hexagon head
D) Oval head
E) Flat head

Question 8

The smallest diameter of a screw thread is called ____________________.

Question 9

The three basic applications of screw threads are __________, __________, and __________________.

Question 10

The standard screw thread agreed upon for international screw thread fasteners is the _____________.

Question 11

Which class of fit is recommended for only high-cost situations where continual checking is required? ___________________

Question 12

In the thread note .25-20UNC-2B-LH, what is the class of fit? ________________

Question 13

That part of a thread that is identified as the top surface where two sides join is called _____________.

Question 14

The thread with flattened roots and crests having a stronger thread describes ____________________.

Question 15

The series of threads typically used in automotive and aircraft construction are _________________.

Question 16

In structural work, the hole is approximately ___________ larger than the rivet.

Question 17

Springs are classified as helical or __________.

Question 18

A machine screw is a screw with a head that is screwed through one member and is forced against another member.

Question 19

On drawings of bolts of less than ½" diameter, the chamfer is omitted.

Question 20

Three types of compression springs are helical, extension, and torsion.

Question 21

A key is used to prevent relative movement between a shaft and wheel.

Question 22

The screw identified as .75x2.50 HEX CAP SCR is 2 ½ inches long.

Question 23

The jam nut is a special nut to allow easy unscrewing.

Question 24

The widths of keys are usually about one-third the shaft diameter.

Question 25

What is the tap drill size on an 8UN 1 ½" screw? __________

Question 26

What is the tap drill diameter on an M33x3.5? __________

Question 27

What is the drill diameter in mm of a $\varnothing$ .2835" ? __________

Question 28

What is the height H of a Hex (UNFIN) bolt having a $\varnothing$ 1-3/8" ? _________

Question 29

What is the bolt max thickness of a high strength structural bolt of a M16x2 ? ________

Question 30

What is the radius of the curved head of a pan head machine screw, having a nominal size of 8? _________