Question

Specify (8) 1/4-20 UNC threads in aluminum/ (8) 4-40 UNC threads in aluminum/ either

A) (8) 1/4-20 UNC threads in aluminum
B) (8) 4-40 UNC threads in aluminum
C) Either

Answer 1

This question is about specifying threaded holes in aluminum using the 1/4-20 UNC and 4-40 UNC thread sizes.

Step-by-step explanation:

The question is asking about specifying threads in aluminum using the 1/4-20 UNC and 4-40 UNC thread sizes. The terms 1/4-20 UNC and 4-40 UNC represent the thread size and thread pitch. The UNC stands for Unified National Coarse threads, which are common in the United States.

For the first part of the question, (8) 1/4-20 UNC threads in aluminum refers to eight threaded holes with a 1/4-20 UNC thread size in aluminum material. Similarly, (8) 4-40 UNC threads in aluminum means eight threaded holes with a 4-40 UNC thread size in aluminum material.

Option C, either (8) 1/4-20 UNC threads in aluminum or (8) 4-40 UNC threads in aluminum is a choice between having 8 of one thread size or 8 of the other in aluminum material.