IP68 O-Ring Sealing Nut

IP68 sealing nut with an O-ring in the face: the ring is compressed against the mating surface as the nut is tightened.

Key specifications

Installationthreaded in, compressing the O-ring
StandardGB/T 3452.1 (O-rings), GB/T 197
Typical substratehydraulic, coolant and pneumatic circuits
Key inspectionsleak/pressure hold, O-ring hardness, groove dimensions
Drive TypeTorx Plus

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Product overviewOverview

O-ring sealing is compression sealing. An O-ring seals by controlled compression in a groove, so groove depth and the surface it bears on decide the result. A face that is scored or not square loads the ring unevenly, and the leak appears on the side with less compression.

installed by threaded in, compressing the O-ring.

Key featuresFeatures

Groove depth and face squareness set the seal.
Integrated O-ring seals as the joint is tightened, with no extra sealant step.
Groove volume and compression matched to avoid extrusion or shear.
Elastomer selected to the medium: NBR for oils, FKM for heat and chemicals.

Typical applicationsApplications

Hydraulic manifold and line ports
EV motor cooling circuits
Pneumatic cylinders and valve end caps

Selection notesSelection

Specify the mating face finish and squareness with the nut; a ring that is compressed on one side only will leak even at the correct torque.

Frequently asked questionsFAQ

Why does an O-ring nut leak at the correct torque?

Because torque does not guarantee even compression. If the mating face is out of square or scored, the ring is compressed on one side and relieved on the other.

What matters during installation of the IP68 O-Ring Sealing Nut?

Do not reuse a compressed O-ring — it takes a permanent set and will not seal again at the same groove depth Groove depth and face squareness set the seal.

Specifications

Drive Type	Torx Plus
Standard	GB/T 3452.1 (O-rings), GB/T 197
Installation	threaded in, compressing the O-ring
Typical substrate	hydraulic, coolant and pneumatic circuits
Key inspections	leak/pressure hold, O-ring hardness, groove dimensions

Manufacturing and inspection

O-ring hardness (Shore A) and compression set are sampled to the GB/T 3452.1 series.We recommend a pilot assembly at the actual torque and mating part before locking the process parameters for volume.