DIY Electric Car Forums banner
1 - 1 of 1 Posts

·
Registered
Joined
·
10 Posts
UNC stands for UNified Coarse thread, there is also UNF for UNified Fine thread, among other more arcane thread sizes. 1/4 is the nominal hole size in inches of course and 20 is the number of threads per inch implied by the course name. I've attached a .pdf file of my wHOLE Chart that gives all the decimal equivalents, thread sizes and the drill sizes for them. Also has metric sizes for you. Personally, after using both systems for years, metric is nice for doing calculations, but when doing the hands on work I find the fractional system more convenient.
 

Attachments

1 - 1 of 1 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top