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TM 9-2330-326-14&P
H-7. FASTENER SIZE AND THREAD PATTERN
Threaded fasteners are categorized according to diameter of the fastener shank. Thread styles are
divided into broad groups, the two most common being coarse (Unified CoarseUNC) and fine (Unified
FineUNF). These groups are defined by the number of threads per inch on the bolt shanks. In
addition, threads are categorized by thread class, which is a measure of the degree between threads
of the bolt or screw (external threads) and threads of the attaching nut or tapped hole (internal threads
of the attaching nut or tapped hole) (internal threads). The most common thread class for bolts and
screws is Class 2.
NOTE
Unless followed with -LH (e.g., 3/4-10 UNC-2A-LH), threads are right-hand.



 


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