TM 9--2350--292--20--20720 00--4TORQUE LIMITS -- CONTINUED0720 00TIGHTENING METAL FASTENERS -- CONTINUEDTable 3. TORQUE RANGESSTATED RANGEMOST EFFECTIVE RANGE0--200 lb--ft0--600 lb--ft0--170 lb--ft15--75 lb--ft50--150 lb--ft150--450 lb--ft44--131 lb--ft30--60 lb--ftFASTENER SIZE AND THREAD PATTERNThreaded fasteners are categorized according to diameter of the fastener shank. Thread styles are divided into broadgroups, the two most common being coarse (Unified CoarsUNC) and fine (Unified FinUNF). These groups are de-fined by the number of threads per inch on the bolt shanks. In addition, threads are categorized by thread class(Table 4), which is a measure of the degree of fit between the threads of the bolt or screw (external threads) and thethreads of the attaching nut or tapped hole (internal threads). The most common thread class for bolts and screws isClass 2.Table 4. THREAD CLASSES AND DESCRIPTIONEXTERNALINTERNALFIT1A2A3A1B2B3BLOOSE FITMEDIUM FITCLOSE FITThread patterns are designed as follows:NOMINAL SIZENO. THREADS/INCHTHREAD SYMBOLTHREAD CLASS3/410 UNC 2ANOTE: Unless followed with --LH (e.g. 3/4--1 OUNC--2A--LH), threads are right hand.HIPH1511THICKNESSOR HEIGHTOF HEADLENGTH(BOLT SHANK)BODYLENGTHNOMINALDIAMETERTHREADRUNOUTLENGTHTHREADLENGTHGRIPLENGTHHEIGHTOF NUT
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