Deck 20: Representing and Specifying Internal and Left-Hand Threads

Question 1

In the case of internal threads, the thread length is specified as the ____.

A) depth of thread
B) height of thread
C) width per thread
D) length per thread

Answer 1

A

Question 2

Describe how a part can be threaded.

Answer 2

A part may be threaded internally throughout its entire length or to a specified depth, either by tapping or another machining process. Some threads are bottomed at the same depth as the tap drill. In other cases, the tap drill hole may be deeper.

Question 3

Discuss dimensioning a thread hole.

Answer 3

The same system of dimensioning that is used to specify external threads applies to internal threads. However, in the case of internal threads, the thread length is specified as the depth of thread.

Question 4

Explain how the right-hand and left-hand screws are advanced.

Question 5

The accuracy between an external and an internal thread is specified in trade handbooks and manufacturer's tables as a ____.

A) thread fit
B) thread form
C) thread class
D) thread code

Question 6

List and describe the three regular class fits for internal and external threads.

Question 7

One of the most practical and widely used methods of producing internal threads is to cut them with a round, formed, thread-cutting tool called a ____.

A) binder
B) bore
C) grinder
D) tap

Question 8

Describe how a tap is used.

Question 9

The accompanying figure is an example of a(n) ____ thread.

A) right-hand
B) left-hand
C) top
D) bottom

Question 10

How are the three regular classes of fits for external and internal threads distinguished from one another?

Question 11

The letters ____ are included on the drawing specifications to indicate when a left-hand thread is required.

A) LH
B) LHT
C) LT
D) LTH