When just fastening

isn’t enough.™

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 com-

patibility 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.

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.

2

Typical Applications

Sealing Performance

Under High Pressure

Custom Self-Sealing

Fasteners

Self-sealing SEELSKREWS®, SEELBOLTS®,

SEELRIVETS® and SEELNUTS® are available in other

sizes, lengths, materials, head styles (including tamper-

resistant) 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.

Pre-assembled

O-Ring Seals in

Geometric Groove

• 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

Fully compressed

metal-to-metal

contact

®

Recognized

Visit our website

for downloadable

CAD drawings:

www.apmhexseal.com

Visit our website

for downloadable

CAD drawings:

www.apmhexseal.com