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

Air & Liquid-Tight Bonded Self-Sealing Washers

Reusable and vibration-resistant

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APM self-sealing washers

The APM line of self-sealing washers and fasteners are designed to seal out air, water, lubricants and other liquid or gaseous contaminants.

SEELOC® self-sealing washers are vibration-resistant, each having a silicone rubber section, molded and bonded to a stainless steel formed washer. These self-sealing washers are designed for use with regular screws, bolts or studs for sealing panels and enclosures having large or irregular clearance holes or slots, and can also be used to seal openings of protruded mounting holes. Upon tightening, a seal is formed within the shank and threaded surface of the fastener as well as around the periphery of the washer face.

Features and Benefits:

  • UL & CSA Recognized for NEMA 4x Type 6 Rating
  • UL Tested
  • IP 66/68 Rated
  • Positive sealing under vacuum or pressure
  • Install like a conventional washer
  • Reusable & compatible with all surface finishes
  • Metal-to-metal contact assures fastening and sealing integrity
  • Optional seal materials - silicone rubber, BUNA-N, *Viton®, others
  • Optional black oxide finish with black silicone rubber
  • Uniform, high-strength design - exceeds 100psi internal & external
  • Temperature range of -160°F to +500°F (-106°C to +260°C)
  • Metric sizes available
  • Made in USA

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

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To order vibration-resistant self-sealing washers
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

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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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