Deck 22: Screw Thread Specifications

Question 1

Threads that are designed to handle extreme weight and to transmit power in one direction are:

A)Buttress threads
B)Acme threads
C)Worm threads
D)Unified inch screw threads

Answer 1

A

Question 2

An imaginary cylinder that passes through the threads at a point where the width of the thread and the width of the groove are equal is the:

A)Pitch
B)Pitch diameter
C)Minor diameter
D)Major diameter

Answer 2

B

Question 3

For most screw, bolt, and nut applications you would use:

A)Unified Coarse Series
B)Unified Fine Series
C)Unified Extra-fine Series
D)Constant-pitch Series

Answer 3

A

Question 4

The distance from the root to the crest of the thread is:

A)Major diameter
B)Minor diameter
C)Thread depth
D)Pitch

Question 5

The major diameter is the smallest diameter of the thread for a screw or a nut.

Question 6

The letters A and B are used in the Unified Inch Screw Thread Series. For internal threads, the letter A is used.

Question 7

A screw thread is a ridge of uniform section in the form of a helix on the external or internal surface of a cylinder or hole.

Question 8

For Unified Inch Series screw threads, a Class 1A provides a looser fit than a Class 3A.

Question 9

The major diameter is also called the:

A)Pitch diameter
B)Minor diameter
C)Nominal diameter
D)Pitch

Question 10

Threads that are very strong and are used to transmit power and motion in either direction are:

A)Buttress threads
B)Acme threads
C)Worm threads
D)Unified inch screw threads