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Question

Difficulty: EasyScrews and Threads

A mechanic has four different bolts. Arrange the bolts in order from the LEAST linear distance traveled per full revolution to the GREATEST linear distance traveled per full revolution.

  1. 1A bolt with 32 threads per inch (TPI)
  2. 2A bolt with 20 threads per inch (TPI)
  3. 3A bolt with 16 threads per inch (TPI)
  4. 4A bolt with 10 threads per inch (TPI)

Answer

The correct order from least to greatest linear travel is: 32 TPI, 20 TPI, 16 TPI, and 10 TPI.
The linear distance a screw travels in one full revolution is its pitch, which is calculated as 1 divided by the Threads Per Inch (TPI). A higher TPI means the threads are closer together, so the screw advances a shorter distance per turn. Therefore, to order them from least to greatest distance traveled, you must arrange them from highest TPI to lowest TPI: 32 TPI (1/32 inch), 20 TPI (1/20 inch), 16 TPI (1/16 inch), and 10 TPI (1/10 inch).

Step-by-Step Solution

1
Understand the relationship between threads per inch (TPI) and linear travel.
Linear travel per revolution, also known as pitch, is equal to 1 divided by the TPI.
Each full turn advances the screw by one thread pitch.
2
Determine the linear travel for each bolt.
32 TPI = 1/32 inch, 20 TPI = 1/20 inch, 16 TPI = 1/16 inch, and 10 TPI = 1/10 inch.
Applying the relationship pitch = 1 / TPI.
3
Order the calculated values from least to greatest.
1/32 < 1/20 < 1/16 < 1/10.
The question asks for the order starting with the least linear distance traveled.

Key Concept

The linear distance a screw travels in one revolution is its pitch. For standard screws, pitch is the reciprocal of the threads per inch (TPI). Therefore, a higher TPI results in a smaller linear travel per revolution.
Estimated Time:45s
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Topics

Screws and Threads

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