FASTENER SIZE AND THREAD PATTERN

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Table H-1. Torque Limits for Dry Fasteners.

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TM-9-2330-326-14-P Semitrailer Tactical Drop Deck BreakBulk/Container Transporter 22-1/2 TON M871A3NSN 2330-01-458-6865 Manual

FASTENER GRADE

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.