APM Fasteners News
AIR & WATER-TIGHT SELF-SEALING WASHERS
APM HEXSEAL is pleased to announce the addition of SEELOC® self-sealing washers to its growing
family of reusable, self-sealing fastener assembly hardware.
These standard self-sealing washers feature a silicone rubber section bonded to a specially-formed
stainless-steel washer. SEELOC pressure range exceeds 100 psi internal/external and is UL
Recognized for NEMA 4x Type 6 Ratings with an IP 66/68 Rating. Other sealing materials and sizes,
including metric, are available for specific applications. Temperature range of -160°F to +500°F.
Each is designed for use with standard screws, bolts and lock-nuts to seal panels, casings, housings and other
electrical and non-electrical assembled enclosures, including large fastener clearance holes/slots. Upon
tightening, they provide a 360° seal under the head of a standard screw, bolt or nut, as well as sealing
around the periphery of the washer face preventing leakage. In addition, their rubber surface serves to
increase the fasteners’ ability to prevent loosening due to vibration. Typical air and water-tight
applications include food and other processing systems, instrumentation, communications, military, heavy-duty
vehicles, medical and various industrial types of equipment. NEMA and other electrical enclosures are
also protected.
SEELOC washers are available with outside diameters of 1/2", 1" and 1 1/2" for screws/bolts having
thread sizes from #6 through 1/2". Lock-nuts can also be used to secure SEELOC washers.
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About APM HEXSEAL Fastener Division
For more than half a century APM has specialized in developing self-sealing fasteners that conform to their original patent featuring an under-the-head, asymmetrical groove with an embedded O-Ring. Other divisions produce seals for electro-mechanical switches and circuit breakers that protect against the impact of hostile environments.
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