Standard Imperial-measurement threading are, in order of sizes:
- 1/4" (smallest)
- 3/8" (medium)
Things to know:
"(double quotes) means "inches"
- There are "thread adapters" which can let you screw together things of different sizes.
"Male" and "Female" are used to indicate tabs and slots.
- The male end is the straight part with the threads you can easily see.
- The female end is the socket that you have to look into to see the threads.
You are generally interested in male-to-female adapters. For example:
- 5/8" Male to 3/8" Female (largest to medium).
Female-to-male adapters look liked shafts. Here are the common ones: