High Performance Bonded Seal Series for Hydraulic and Pneumatic Systems

In applications that require high pressure sealing—especially in bolted and
threaded connections and pipe joints—failure rarely gives a second chance.
Mechanical engineering teams, hydraulic and pneumatic systems, and the oil and
gas industry rely on the bonded seal series to create a dependable face seal
simply by tightening the joint.

What it is and why it works

A bonded seal is a washer: a hard outer ring, typically steel, and an inner
elastomeric ring that acts as a gasket. The elastomer—often nitrile rubber
(NBR)—is bonded by heat and pressure to the metal, so it stays in place under
load.

Tightening compresses the elastomer between mating faces while the metal ring
limits lateral flow, boosting burst resistance and pressure rating.

Because the metal ring itself retains the gasket, parts don’t need grooves to
capture an O‑ring. That simplifies machining and raises assembly tolerance.

Two styles exist: self‑centring designs add an inner rubber lip to locate the
seal at the hole’s centre; non‑self‑centring variants suit broader
geometries.

Materials, pressure, temperature

· Metals: zinc‑plated/phosphated carbon steel, or stainless 304/316 where
corrosion matters.

· Elastomers: NBR for general oil service; FKM for elevated temperature and
chemicals.

· Pressure: well suited to mid‑to‑high static pressures in hydraulic duty;
actual limits depend on size, compound, surface finish, and preload—validate
against your duty cycle.

Temperature (typical): NBR about −40 to 125°C; FKM −20 to 250°C.

Where the bonded seal series adds the most value

· Connection types: bolt/stud face sealing, BSP/NPT/Metric/SAE shoulders,
auxiliary flange sealing, plugs and sensor ports.

· Industries and equipment: pumps, motors, gearboxes, engines and lube
systems; hydraulic and pneumatic manifolds; construction and agricultural
machinery; oil and gas production/transfer; chemical and metallurgical lines;
water treatment skids; marine/offshore packages; wind turbine yaw/pitch
hydraulics; commercial vehicles and passenger cars; industrial machinery and
hydraulic actuators.

Work with DEDE for a smoother path

Services:

· Fast shipment of standard parts—broad coverage of O‑rings, oil seals and
more to meet urgent needs.

· End‑to‑end customization—from compound selection and geometry to
production testing—for non‑standard seals matched to your media, load, and
temperature.

· Technical enablement—30+ years of sealing experience to refine your stack,
cut maintenance, and lift reliability.

Highlights:

· In‑house intelligent manufacturing;

· Wide model coverage with stock on hand;

· Shipped to 80+ countries;

· Trusted by well‑known global brands;

· Provincial technology innovation centre credentials;

· Recognized as a specialized and innovative enterprise, and as a high‑tech
enterprise;

· A leading player within a featured industrial cluster.

Practical selection and assembly tips

· Choose elastomer by medium and temperature first; match metal ring corrosion
resistance to the environment.

· Size ID/OD to the fastener and shoulder; pick self‑centring types when
speed and concentricity matter.

· Keep faces flat and clean (aim for Ra ≤ 1.6 μm); torque per fastener grade
and lubrication to avoid over‑crushing. Pressure‑ramp on commissioning,
leak‑check, and re‑torque after early thermal cycles for long‑term
stability.

For joints where leakage is not an option, the bonded seal series converts risk
into routine: locate, tighten, pressurize. If you’re weighing standard versus
custom, DEDE can align materials and geometry to your pressure window and media
so the seal performs from day one.

Minimum Order: 500 pieces

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