Examples apply to all types of bolts, fillister-head  screws, square-head plugs, and other similar parts  which are wired so that the loosening tendency of  either part is counteracted by tightening of the other  part. The direction of twist from the second to the  third unit is counterclockwise in examples to keep the  loop in position against the head of the bolt. The wire  entering the hole in the third unit is the lower  wire, and by making a counterclockwise twist after it  leaves the hole, the loop is secured in place  around the head of that bolt. Example shows methods for wiring various standard items. NOTE: Wire may be wrapped over the unit rather than around it when wiring  castellated nuts or on other items when there is clearance problem. Coupling nuts on a tee shall be wired, as shown above, so that tension is always in the tightening direction. Coupling nuts attached to straight connectors shall be wired as shown when hex is an integral part of the connector. Correct application of  single wire to closely spaced multiple group. Fittings incorporating wire lugs shall be wired as shown in 7 and 8. Where no lock-wire lug is  provided, wire should be applied as shown in 9 and 10 with caution being exerted to ensure that  wire is wrapped tightly around the fitting. Example 3 Example 1 Example 2 Example 8 Example 4 Example 9 Example 5 Example 10 Example 10 Example 6 Example 6 Example 7 Figure 2-93.  Examples of various fasteners and methods of safetying. 2-56