The advantages of using APM Hexseal Embedded O-Ring Self Sealing System:
Over-tightening can lead to damage/destruction of the o-ring or washer
Usually, this means that the o-ring or washer needs to be replaced when re-installing the fastener (after maintenance / repair). In reality, it usually results in re-use of the damaged o-ring or washer and likely loss of proper sealing.
APM Hexseal's design is a tested and proven system that guarantees a high pressure seal and full re-usability. Fasteners have been third-party tested by UL and have been given UL Recognition for enclosure protection levels of NEMA 4X and 6P (equal to IEC IP67/IP68) - hosedown and submersible ratings.
The tightening results in full metal-to-metal (No rubber mount) contact that gives a long and trouble-free life. In most cases, the fastener does not require additional thread locking features (of, course, for high vibration applications, Switches Plus Components offers nylon pellets or strips or patches to fully lock the fasteners).