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Thread fit is a measure of looseness or tightness. For unified inch threads, there are 3 thread classes. Learn about each and how they function.
Resources
Thread Tolerance
KATOpedia Pitch Diameter and Class of Fit
What Are the Different Types of Screw?
Fastener Thread Classes Explained
Thread Pitch - an overview
Thread Tolerancing
What's the thread all about?
Thread Dimensions: A Complete Guide - EngineerExcel
Screw Thread Basics - Roy Mech
The Difference Between 2A & 3A Threads Part 2 - Wilson-Garner
Screw Thread Terminology Explained