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Sealing Performance

Under High Pressure

APM Hexseal invented and patented pre-assembled

self-sealing fasteners designed to provide both fastening

and sealing integrity in a single unit. Their design features

a resilient O-ring held captive in a precision engineered

groove under the fastener head. This combination of

precise groove geometry and O-ring characteristics

results in an absolute seal regardless of surface finish,

while still providing full metal-to-metal contact.

Vibration-resistant and re-usable, SEELSKREWS®,

SEELBOLTS®, and SEELNUTS® can withstand

internal/external pressures up to 6,000 psi/vacuum at

temperatures from –160°F to +500°F.

Made in the U.S.A., APM Hexseal self-sealing

fasteners are available in standard and metric thread

sizes. And the integral seal can be formulated for compatibility with a wide range of gases and liquids.

They represent a superior sealing alternative to

sealing compounds, tape, chemical coatings, and

deformable washers that attempt to seal the threadform

Custom Self-Sealing

Fasteners

Self-sealing SEELSKREWS®, SEELBOLTS®,

SEELRIVETS® and SEELNUTS® are available in other

sizes, lengths, materials, head styles (including tamperresistant) and finishes. These can be produced with an O-ring material (see Table I) best suited for your application. Also, other types

of fastening hardware like standoffs can be modified to become self-sealing. Should you not find what you need in this catalog, please

consult the factory. We would be pleased to work with you to satisfy your specific application requirements

Features and Benefits

• Positive sealing under pressure or vacuum.

• Easy-to-install … pre-assembled unit installs

like a conventional fastener.

• Metal-to-metal contact resists loosening due to

vibration, and assures fastening integrity.

• Re-usable … repeated installation and

removal does not affect sealing effectiveness.

• Compatible with all surface finishes.

• UL and CSA Recognized … tested and listed

to UL Standard 50, Types 1-13, and CSA

Standard C22.2 No. 40.

• Optional O-ring seal materials assure

performance with wide variety of gases

and liquids.

• Uniformity and high strength assure

repeatable performance.

• No adhesives, coatings or tape required.

Typical Applications

• Pressure Gauges

• Gear Boxes/Transmissions

• Valves

• Motor Housings

• Fuel Tanks

• Cylinders

• Pumps

• Equipment Housings/Cabinets

• Air Conditioning Equipment

• Hydraulic Systems

• Portable Instruments

• Engines

• Instrument Housings/Panels

• Military Equipment

• Portable Communications Equipment

• Food Processing Systems

• Or any application where leakage can

compromise reliability