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Stat - O - Seals

Most fluid systems have fasteners that must be sealed. Parker’s fastener seal designs found in the Stat-O-Seals and thread seals feature an elastomeric sealing element molded in place within a metal retainer or washer.

 Although resembling a simple o ring groove concept, the mold in place fastener seal offers numerous advantages. Ideal for sealing small and miniature sizes, the lock seal is a two piece combination seal comprising a separately molded o ring fitted within a surrounding metal washer. Other speciality fastener seals are also available in the market.


Aluminum Stat-O-Seals are much more reliable than the more common steel version. Even if the rubber portion fails to make contact all around the port, the aluminum acts as a crush washer, providing a reliable metal on metal seal. Each Stat-O-Seal has a Buna N inner seal bonded to the center of the aluminum washer. The rubber is resistant to water, oil, and petroleum fuels (not for use in brake systems). Use them to seal screws, bolts, or plumbing fittings. The rubber insert is molded to be slightly thicker than the washer, though not quite as thick as a standard rubber O ring. Stat-O-Seals should not be used to replace O rings on chamfered ports.

Stat-O-Seal sealing rings consist of a synthetic rubber O ring which is capable of withstanding -85° to +450° F, mechanically locked to the inside diameter of an aluminum washer. When tightened, the rubber at the center of the washer is compressed. This forces the sealing surfaces around the bolt shank to provide the advantages of an O ring seal without machining grooves into the part.

These Stat-O-Seals are one piece, molded-in-place seals with the rubber sealing element mechanically and/or chemically bonded to the metal retainer. Parker’s “Splined and Coined” mechanically bonding feature is used on many 600, NAS1523 and 610 series sizes. This feature ensures a positive attachment of the rubber to the retainer, eliminating missing or loose seal elements associated with bonded seals. A Stat-O-Seal is designed to seal beneath the head of the fastener as shown for both internal and external pressure and vacuum systems. A Stat-O-Seal offers users long and reliable service, a high degree of reusability and easy assembly.

There are many advantages of using these seals. Some of the advantages are that no machined O-ring grooves are required in the mating flange. They are precisely controlled optimum percent squeeze eliminates over compression. The retainer edge is visible after installation allowing for easy visual inspection and reducing failures caused by missing seals. The ridged self centering design provides easy and accurate placement of the seal. The solid metal to metal contact improves joint stability and eliminates re-torquing. Long reliable service and a high level of reusability. Another advantage is that the rubber or bolt interference provides for easy assembly.

Owing to the unique features, the seal is widely used in a lot of industries, such as machine tool, boat, automobile, metallurgical machinery, chemical machinery, engineering machinery, building machinery, plastics, agriculture and different instruments. Darcoid Nor-Cal Seal provides O rings which are highly cost effective, have high production rate sourcing to the highest technologies of perfluoronated elastomers like Parofluor, Parofluor ULTRA, Kalrez, Chemraz, Simriz and Perlast. A stat-o-seal can play an important role in two directions' seal and is applicable for different seal media such as oil, water, gasComputer Technology Articles, chemical medium and other mixed media. The uniqueness of these O-rings from the house of Darcoid Nor-Cal Seals makes the product reliable and sustainable.

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Darcoid's vast experience in managing seal supply chains uniquely qualifies the company as the choice for all your sealing needs. Our value added programs are designed to integrate into your processes based on your company goals and suppliers requirements. Darcoid Nor-Cal Seal is the worlds leading diversified manufacturer of motion and control technologies and systems, providing precision-engineered solutions for a wide variety of commercial, mobile, industrial and aerospace markets.

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