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Imperial Socket Countersunk Sealing Screws.

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Imperial Socket Countersunk Sealing Screws

What are Imperial Socket Countersunk Sealing Screws?

Configured with a uniquely engineered grooved on the underside of the screw head, the built-in O-ring of this Imperial Countersunk Sealing Screw is designed to create a permanent hermetic seal when fastened. As a result, this prevents contaminants or toxins seeping into the environment whilst stopping internal and external leakages.

This type of Sealing Screw is intended to be used to protect and fortify the most sensitive equipment, even under extreme temperatures and atmospheres, acting as a total deterrent against contamination from liquids, gases and other substances.

Manufactured with pressure resistance to 1500 psi, these Imperial Socket Countersunk Sealing Screws are produced in the USA by ZAGO to meet Military Standard NASM 82496.

To create a permanent 360° airtight seal that also permits metal-to-metal contact for optimum performance, it is recommended to use a clearance hole. Doing so allows the O-Ring to squeeze and reshape itself within this additional space, ensuring that the O Ring will not break when the screw is torqued.

Fitted with a standard Hexagon (Socket) Drive for simple installation, this range of Socket Sealing Screws is compatible with our Imperial Hexagon Socket Key Wrenches.

Accu also stocks Imperial Torx Countersunk Sealing Screws, ideal for applications requiring a high torque transmission and increased resistance to cam-out during installation.


Manufactured from 304 (A2) Stainless Steel as standard, alternative screw materials for this range are available on request.

Accu lists several material options for the built-in O Ring of these Sealing Screws with Buna, Fluorosilicone and Viton (Fluorocarbon) all offered as standard. For alternative O Ring materials, please speak to a member of the Accu team.

AccuLock, our specialist thread locking patch, can also be pre-applied to this Self Sealing Screw range, designed to help prevent fasteners from self loosening as a result of vibrations.


Manufactured to ANSI B18.3, Accu’s range of Imperial Socket Countersunk Sealing Screws are available from No. 4 up to ¼” thread sizes, with lengths ranging between 3/16” to 1.½”.

In our standard range, we are also able to supply Metric Sealing Socket Countersunk Screws.

Bespoke Imperial Socket Countersunk Sealing Screws Manufacture.

High precision, bespoke manufacture of Imperial Socket Countersunk Sealing Screws to customer specification. State of the art facilities specialising in both small batch prototyping and large scale manufacture.

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