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6.5. Bolt Installation American Institute of Steel

In such cases, an additional jamb-nut or second nut may be provided. Alternatively, the threads can be spiked or marred or the nut can be tack-welded to the base metal to prevent it from turning. Note that the latter two solutions are permanent actions. There also exist proprietary nut devices with locking features to prevent the nut from Aircraft Threaded Fasteners- Monroe AerospaceA Class 4 fit requires a wrench to turn the nut onto a bolt, whereas a Class 1 fit can easily be turned with the fingers. Generally, aircraft screws are manufactured with a Class 2 thread fit for ease of assembly. Bolts and nuts are also produced with right-hand and left-hand threads. A right-hand thread tightens when turned clockwise; a left


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  • Development of Torque TablesAlternative Torque FormulaTorque-Measuring MethodsThe coefficient of frictioncan vary from 0.04 to 1.10, depending on the materials and the lubricants being used between mating materials. (Table IV from ref. 2 gives a variety of friction coefficients.) Since calculated torque values are a function of the friction coefficients between mating threads and between the bolthead or nut and its mating surface, it is vitally important that the torque table values used are adjusted to reflect any differences in friction coefficients between those used to calculate the table and tClamping, Star and Knurled knobs, Wing Nuts and Wing Our selection of industrial knobs for clamping provides every possible option to suit any application. We have textured nylon knobs, knobs with three to nine lobes (including four-pronged star knobs), triangular knobs, wing nuts and wing screws, and many styles of knurled knobs. Mounting options include threaded stud, tapped, tapped insert

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