What are the different size threads used for?
A B C D
I have some of each size.
Thanks.

They are used for wrapping guides.

Previous convention had that as the power of the rod went up, the size of the thread used on the rod went up.
But in todays world many rods are all built with size A. When one compares the total number of wraps per inch for each of the different sized threds, there is not that much difference in overall strength of each of the rods for a given inch of wrap.
i.e. thread A is less strong than the other thicker threads, but one gets more wraps per inch with the thinnner threads.

Sometimes folks will use a smaller thread for underwraps on heavy rods and then use heavier wraps on the overwraps.

For folks that are just starting with wrapping, it is generally much easier to use the heavier threads. i.e. fewer wraps required, easier to pack closely.

After one has been wrapping a while most folks prefer the smoother look of the thinner and resultatnt smoother surface of the thinner wraps in a finished look.

Good luck
Roger

I am fairly new to rod building. I began by using D thread.
My most recent build I used A thread. I like the A thread a lot more then D. The wraps look so much better then the ones I did with D.
I will not use D again to wrap guides.

On your stronger powered rods start with A and work you way up in size. This way you don't get gaps in your thread when you wrap over a previous wraps. A lot of people use the larger diameter threads for decorative wraps but A works just as well, takes more time and effort though.

Tight wraps and lines,
Wylie