How to Modify the Bolt-Locking Element in an MIL-F-18240

The MIL-F-18240 is a military-grade bolt that contains a self-locking material. The purpose of this design is to keep the nut secured tightly, even in harsh environments. To achieve the military specification, Kel-F is used as the locking agent. It is chosen due to its wide operating temperature range of -400 to 400 degrees Fahrenheit. This material is imbedded in a groove that is milled lengthwise through the bolt's threads.

Instructions

1

Wrap both sides of the bolt's threads with a cloth while keeping the locking mechanism exposed on top.

2

Place the bolt's threads in the vise with the cloth between the two jaws. Close the vise by turning its handle clockwise. Tighten the vice until it holds the bolt firmly without damaging the threads.

3

Cut along the outside, leading edges of the Kel-F locking material with the utility knife.

4

Place the tip of the utility knife horizontally to the bolt and push under the locking material, lifting it.

5

Scrap away any remaining locking material with the utility knife's tip.