One of APM Hexseal’s earliest innovations is the Seelnut®, a hexagonal nut that includes a fully integrated rubber seal with molded rubber threads. Designed and patented by APM Hexseal, these self-sealing nuts can be used with all types of conventional screws, bolts and threaded studs, in applications where there is a need to withstand internal or external pressures.
You can install APM Hexseal’s Seelnuts® just like an ordinary hexagonal nut, but, when torqued, Seelnuts® form a positive seal along the thread section as well as with the contact surface. APM’s Seelnuts® are available in all standard thread sizes as well as a variety of different elastomers to suit your application needs and are also compatible with most surface finishes.
Unlike conventional hexagonal nuts which require an additional o-ring to form a seal, the APM Hexseal Seelnut® is a single piece design that seals without the need for an o-ring. The elastomer is molded into a cavity in the nut itself, specially bonded to the metal. This design reduces the number of parts to be managed and applied, increasing the reliability of the seal, and contributing to overall performance efficiency.
Seelnuts® eliminate the need for gaskets, sealing compounds or surface preparation, resulting in a significant savings of both time and expense. APM Hexseal’s Seelnuts® are also reusable, meaning that they can be easily removed during maintenance, and then simply replaced with the seal being re-established when torqued.
In applications where vibration is a factor, APM Hexseal Seelnuts® are available with an additional factory applied self-locking pellet. In conjunction with the Seelnut® threads, the pellets eliminate the need for castellated nuts. The pellets allow a close fit without the added expense and potential safety concerns associated with other types of thread locking techniques. The integrated self-locking pellets themselves save assembly and maintenance time, further reduce the risk of system failure, and help contribute to workplace safety. Ultimately, the APM Hexseal Seelnut® with the self-locking pellet gives you the ability to set a new standard in equipment performance, sealing and maintenance.