Figure 3.1. Examples of screw locking of threaded connections of American RKT [expansion unknown], a. threaded bushing (lining) with three-sided compression; b. installation of threaded bushing in hull; c. nut with compression of upper part on two sides; d. examples of use; 1. part expanded in the hull for screw locking of bushing; 2. instrument to rotate bushing; 3. instrument to expand upper part; 4. regulating screw (used without screw locking nut); 5. groove under momentum screwdriver; 6. marking of screw. American constructions, a normalized method of manufacturing fasteners (bolts, screws, nuts, screw locking bushing-linings) is used, as well as a procedure for assembly and control. This means of screw locking is used for nuts and linings with deformed threads (Figure 3.1). This preliminary deformation creates the necessary clearance in the thread between the bolt and the nut. Tightening of the threaded parts is done only by with instrument which allows measurement or monitoring of the applied momentum (momentum switches, screwdrivers, etc). The momentum is monitored during fastening to verify the clearance in the thread and during tightening for the creation of the required strength in the threaded connection. For reliable screw locking of the bushing in the hull, which is usually inaccessible for monitoring after assembly, the upper “weakening” of its parts is broken down with a a special instrument. After tightening, the parts of the connection are
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