FASTENER SIZE AND THREAD PATTERN
Unless followed with "LH" (e.g.,3/4-10 UNC-2A-LH), threads are right-hand.
Threaded fasteners are categorized according to diameter of fastener shank. Thread styles are divided into
broad groups, two most common being coarse (Unified Coarse-UNC) and fine (Unified Fine-UNF). These
groups are defined by the number of threads per inch in the bolt shanks. In addition, threads are categorized
by thread class, which is a measure of degree between threads of the bolt or screws (external threads) and
threads of attaching nut or tapped hole (internal threads). The most common thread class for bolts and
screws is Class 2.
Table H-4. Thread Classes and Description.
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