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Why Elastomeric Insert Instead of O-Ring?

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APM Hexseal
44 Honeck St.
Englewood, NJ, 07631

Press release date: March 1, 2014

Why does the APM SEELNUT® use a sophisticated, molded-in elastomeric seal instead of a simple, pressed-in O-Ring?

After patenting the original line of self-sealing fasteners (screws, bolts and rivets) in 1949, which features an embedded O-Ring in a proprietary, asymmetrical groove located in the underside of the fastener's head, our designers looked at designing a sealing nut using a similar approach, but instead determined, because of a totally different dynamic, that the idea of installing an O-Ring on a sealing-nut would NOT be the optimal solution. In order to install an O-Ring onto a sealing nut, the first/second thread of the nut must be removed, weakening the gripping power and clamp load of a torqued nut. Simply installing a conventional O-Ring into the newly made groove does not compensate for the lost holding  strength. In addition, there is a critical secondary problem of O-Ring damage due to the cutting effect from the mating part's sharp thread edges. As the O-Ring is degraded each time it is tightened, the uncertainty of sealing increases. Our engineers developed a superior design, employing a molded-in elastomeric seal (typically silicone rubber) with integral sealing rib and threads that distort slightly when tightened, providing 100% gripping and sealing. There is also no cutting or other damage to the sealing material, maximizing reusability. Given this, we find it strange that any competitor would continue to market a sealing nut that utilizes an O-Ring. APM Hexseal's superior sealing design allows the SEELNUT® to achieve a 6,000psi internal/vacuum rating - a feat that could not be accomplished with a simple pressed O-Ring. 

UL Recognized, APM Hexseal SEELNUTSĀ® are reusable and fully adjustable; they resist vibration and are available with the additional thread locking options of a nylon pellet or nylon patch. Nuts are available in plated steel, stainless steel and a wide range of thread sizes (Imperial and Metric) and types (hex, jam, acorn, etc.).

Stainless-Steel Pushbutton Switch Boot Passed Additional Tough Tests with Flying Colors
The APM Hexseal armored pushbutton was tested to the tough IP69K standard with a high-powered pressure washer. A competitor was tested and the rubber was cut by the jets, but the stainless steel pushbutton wasn't affected.

The fact that the boot's exterior is constructed of No.300 stainless steel providing an armor plate thick enough to resist high-pressure wash downs and high temperatures utilized in food, beverage, dairy, pharmaceutical, petrochemical processing industries, and marine, medical, construction, mining and transportation equipment. Designed to meet MIL-DTL-5423 specification rugged conditions, resistant to salt spray, sunlight, ozone weather, fungus, and most acids, detergents and lubricating oils. UL recognized and features an operational life of 100,000 actuations.

Toll Free: 800-498-9034
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