JB982-77 Combined Seal Washer

JB982-77 Combined Seal Washer

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

 4 year year

Product details

JB982‑77 Composite Sealing Gasket

Product Overview

JB982‑77 Composite Sealing Gasket is a standard metal‑rubber bonded static sealing component for industrial hydraulic system, Power Pack Unit and hydraulic‑driven Machine. It is made of galvanized steel outer ring vulcanized with oil‑resistant rubber inner ring, widely used for threaded pipe joints, plug screws and flange connections of hydraulic circuits.

This composite gasket delivers both high‑pressure rigidity from metal ring and elastic sealing performance from rubber. It prevents hydraulic oil leakage at threaded interfaces, maintains tightness of the hydraulic system, avoids oil contamination, and reduces fault risk of the Power Pack Unit and host Machine.

Technical Specifications

‑ Model: JB982‑77 Composite Sealing Gasket

‑ Product Type: Metal‑rubber bonded composite sealing gasket (Bonded Seal)

‑ Application: Static sealing for threaded joints of hydraulic system, Power Pack Unit and industrial Machine

‑ Material: Galvanized carbon steel outer ring, NBR oil‑resistant rubber inner ring (FKM optional)

‑ Max working pressure: Up to 40 MPa

‑ Working medium: Anti‑wear hydraulic mineral oil, ISO‑VG32 / VG46 recommended

‑ Operating temperature: -25℃ ~ +80℃

‑ Size range: M6‑M60 metric thread matching sizes, full standard series

‑ Installation: Directly mounted between thread joint and nut, no special groove required

‑ Key Features: High‑pressure resistance, good oil‑resistance, easy assembly, reliable static sealing for hydraulic system and Power Pack Unit

Working Principle

Installed at threaded connection points inside the hydraulic system of Power Pack Unit, JB982‑77 composite sealing gasket is compressed when tightening nuts. The elastic rubber inner ring deforms under pressure to fill micro‑gaps between joint surfaces, while the steel outer ring bears mechanical compression force.

It blocks hydraulic oil from leaking out of threaded ports, keeps internal pressure stable of the hydraulic system. Even under vibration and pressure fluctuation from running Machine, the bonded metal‑rubber structure keeps stable sealing performance, preventing oil leakage that may cause failure of the Power Pack Unit.

Core Advantages

1. Combined metal rigidity and rubber elasticity, withstand high‑pressure working conditions of the hydraulic system, effectively stop oil leakage for Power Pack Unit and Machine.

2. Standard JB982‑77 dimension, compatible with most metric hydraulic threaded connectors, easy for new assembly or equipment retrofitting.

3. Vulcanized integrated structure, rubber will not fall off during assembly, stable sealing performance under vibration of working Machine.

4. Wide size range for M6‑M60 threads, suitable for various ports on hydraulic valves, pumps and tank fittings of hydraulic system.

5. Cost‑effective standard spare part, widely used in hydraulic maintenance and manufacturing of Power Pack Unit.

Application Range

JB982‑77 Composite Sealing Gasket is widely applied to the hydraulic system of hydraulic Power Pack Unit, injection molding machines, hydraulic presses, machine tools and other hydraulic‑driven Machine. It is popular among hydraulic system manufacturers, maintenance workshops and global spare‑parts distributors.

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

 Audited supplier

4 year

Address: Ningbo, China

Main Product: hydraulic motor , gear box, hydraulic pump, hydraulic valve , hydraulic winch, hydraulic system

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