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APM HEXSEAL. Since 1947... The world's most hostile environments are our proving grounds.

Self-Sealing Locking Nuts

APM SEELNUT®
High Pressure Self-Sealing Locking Nuts

specifications & selection chart for
   self-sealing nuts

O-Ring materials & characteristics
   selection chart

APM self-sealing locking nuts

The APM SEELNUT® is the original self-sealing nut designed and patented by APM. Our self-sealing locking nuts are designed for use on all types of adjusting screws, threaded studs, and machine bolts in applications where leakage may occur due to extreme pressures.

Installed like an ordinary nut, our self-sealing locking nuts form a high-pressure seal along the thread section and contact surface when torqued. Their single-piece design eliminates the need for gaskets, sealing compounds and surface preparations. Fully-adjustable and reusable, these self-sealing locking nuts resist vibration, provide metal-to-metal contact, and seal under vacuum or internal/external high pressure.

APM self-sealing locking nuts are available in all standard thread sizes, and the integral seal can be formulated for compatibility with most gases or liquids. They can also be supplied with self-locking pellets.

APM's patented, pre-assembled self-sealing nuts, screws, bolts and rivets provide both fastening and sealing integrity in a single unit. Unique design features a resilient silicone O-ring held captive in a precision engineered groove under the head. Vibration-resistant and reusable screws, bolts and nuts withstand internal and external pressures/vacuum to 20,000 psig (137,895kPa). When vibration is an issue, APM offers a full line of self-locking add-ons (pellets, strips, patches).

SEELNUT Self-Sealing Locking Nuts
Features and Benefits:

  • Positive sealing under vacuum or pressure
  • Install like a conventional nut
  • Reusable & compatible with all surface finishes
  • 360° metal-to-metal contact assures fastening integrity
  • Optional O-ring seal materials - silicone rubber, BUNA-N, others
  • Uniform, high-strength design
  • UL & CSA Recognized
  • UL Tested
  • Optional threadlocking add-ons
  • Jam styles available
  • Made in USA

 view FAQs
view threadlocking enhancements for self-sealing locking nuts

To order self-sealing locking nuts
contact your local APM authorized distributor
or call APM Hexseal at 800.498.9034

SAFE. SECURED. SEALED.SM

About APM's Sealing Boots Division:
The Electronics Division of APM HEXSEAL develops and manufactures environmental protection sealing components for controls that are mounted on switches, potentiometers, encoders, and circuit breakers. Using advanced elastomer molding technology, a broad range of sealing boots are produced to match most controls manufactures’ standard part numbers. Most are IP66/68 ingress protection rated and UL Recognized as meeting applicable Canadian and USA enclosure protection standards.

About APM's Self-Sealing Fastener Division:
The APM line of high-pressure, reusable, self-sealing fasteners includes self-sealing screws, self-sealing nuts, self-sealing bolts, self-sealing rivets, and self-sealing washers, all designed to seal in/out air, water, lubricants and other liquid or gaseous contaminants. This sealing hardware is available in Imperial (inch) and metric sizes with various sealing material and thread-locking options, most of which are UL Recognized Components for Canada and the USA.


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Colorizing Lamp Filters

Self-Sealing Fasteners & Washers

SEELSKREW® Self-Sealing Screws

SEELBOLT® Self-Sealing Bolts

SEELNUT® Self-Sealing Nuts

SEELRIVET® Self-Sealing Rivets

SEELOC® WASHER Self-Sealing & Self-Locking Washers

Contact Us

Toll Free: 800.498.9034
eMail: info@apmhexseal.com

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  HEXSEAL®, SEELSKREW®. SEELBOLT®, SEELNUT®, SEELRIVET®, SEELOC® are registered trademarks of APM Corp.  
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