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TM 9-2350-287-34 C-4.  TIGHTENING  METAL  FASTENERS  (continued). Table C-3. Torque Ranges STATED RANGE MOST EFFECTIVE RANGE 0-  200  in-lb 4  -  13  ft-lb 0-  600  ft-lb 50 - 450 ft-lb 0 - 170 ft-lb 44 - 131 ft-lb 15 - 75 ft-lb 30  -  60  ft-lb C-5.  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 Coarse-UNC) and fine (Unified Fine-UNF). These groups are defined by the number of threads per inch on the bolt shanks. In addition, threads are categorized by thread class (Table C-4), which is a measure of the degree between threads of 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. Table C-4. Thread Classes and Description EXTERNAL INTERNAL INTERNAL 1A 1B LOOSE  FIT 2A 2B MEDIUM FIT 3A 3B CLOSE  FIT C-4

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