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

Self-Sealing and Self-Locking Bolts

Reusable, High-Pressure Self-Sealing Bolts

specifications & selection chart for
   self-sealing bolts

O-Ring materials & characteristics
   selection chart

APM self-sealing locking bolts

The APM SEELBOLT® is the original self-sealing bolt designed and patented by APM. The APM line of self-sealing bolts, screws, and nuts are designed to seal out air, water, lubricants and other liquid or gaseous contaminants. Our self-sealing bolts and screws are available in many standard thread sizes and with optional O-ring sealing materials. Self-sealing bolts and screws can also be supplied with either self-locking pellets, strips or patch, Black oxide, painted heads, or in a captivated (KAPTO-SKREW®) configuration. Sheet metal and other type fasteners available on special order.

APM's patented, pre-assembled self-sealing bolts and screws 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 bolts, screws 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).

SEELBOLT Self-Sealing Locking Bolts
Features and Benefits:

  • Positive sealing under vacuum or pressure
  • Install like a conventional bolt
  • Reusable & compatible with all surface finishes
  • 360° Metal-to-metal contact assures fastening integrity
  • Optional O-ring seal materials - silicone rubber, BUNA-N, *Viton®, others
  • Uniform, high-strength design
  • UL & CSA Recognized
  • UL Tested
  • Optional threadlocking add-ons
  • Type ST

*Viton® is a registered trademark of DuPont Performance Elastomers.

view FAQs
view threadlocking enhancements for self-sealing & self-locking   bolts

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


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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Switch & Circuit Breaker Boots

Switch & Potentiometer Boots

IQ Series Boots

Circuit Breaker Boots

Custom Elastomeric Molding

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

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