The Stat-O-Seal® fastener is designed with a pre-calculated interference factor built into the teardrop shaped elastomeric seal. The cross-section free height of the rubber is greater than the metal retainer, providing the proper compression without squeezing the seal beyond its elastic limit.

Stat-O-Seal fasteners 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” mechanical 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. Stat-O-Seal fasteners are designed to seal beneath the head of the fastener for both internal and external pressure and vacuum systems.

Stat-O-Seal fastener features and benefits include:

     • No machined O-ring grooves are required in the mating flange
     • Precisely controlled optimum percent squeeze eliminates over compression
     • Easy assembly. The self centering design ensures accurate placement of the seal.
     • The retainer edge is visible after installation allowing for easy visual inspection and reducing failures caused by missing seals
     • The solid metal to metal contact improves joint stability and eliminates re-torquing
     • Long reliable service and a high level of reusability
     • Rubber/bolt interference provides for easy assembly

As the fastener is installed into the mating hardware, the elastomer is compressed down to the retainer thickness. The retainer provides a positive alternate load path for fastener torque and forms a protective gland area for the confinement of the seal in a controlled state. Since the elastomer seal cannot move outward, the mass of the seal is forced inward against the shank of the fastener and against the mating surfaces, creating a positive seal. This principle is known as controlled confinement sealing. The diameter of the fastener head should always exceed that of the maximum "E diameter" in order to preserve this principle. (See Related Support Documents for details)

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