- 1). Push the locking washer or spring washer onto the screw before screwing your pieces together. Locking or spring washers are very effective for locking screws into wood and some metal applications. Low to medium vibration environments, such as a washing machine, are appropriate for this method. Low pressure wood constructions (tables, book shelves) are also good places to apply this method.
- 2). Drill a hole for a threaded insert for your screw. Tap the insert into the hole with a hammer (using very gentle force) then insert your screw. This method (sometimes referred to as lagging) is excellent for high pressure and unstable materials (such as dry wall). The threaded insert provides resistance to the screw and will not allow it to cut into the material, widen the hole and fall out.
- 3). Start the screw into the hole and with the top five threads still showing beneath the head, add a drop or two of Loctite. Seat the screw. Loctite will form a seal between the threads of the screw and the threads of the hole much like glue. This method is highly recommended for metal applications subject to heat, vibration and pressure (such as any type of motor).
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