JB982-77 Metric Combination Metal-Bonded Sealing Washers | Industrial Pipe & Flange Seals

JB982-77 Metric Combination Metal-Bonded Sealing Washers: Materials, Applications, and Advantages

JB982-77 combination metal-bonded sealing washers are widely used in industrial piping and flange connections to provide a reliable, high-pressure, leak-proof seal. These washers consist of two or three components: a metal washer, a soft rubber washer, and an optional center washer. The combination of metal and rubber ensures superior sealing performance and prevents oil and gas leakage, reducing industrial losses.

Structure and Material

1. Metal-rubber bonding: These washers are made of metal and rubber vulcanized together. The metal ring offers rigidity and corrosion resistance, while the rubber ring ensures elasticity and sealing performance.

2. Materials:

• Metal: Carbon steel, stainless steel, copper, zinc-plated steel, aluminum, or alloy steel.

• Rubber: Oil-resistant nitrile (Buna-N), fluorine rubber (FPM/Viton), EPDM, neoprene, or Fluoroprene  fluoroelastomer for sanitary applications.

3. Sizes: Available in metric and imperial sizes, meeting JB982-77 standard specifications.

4. Types:

• A-type and B-type washers, based on structural form.

• Full or half rubber coatings,  depending on application requirements.

Key Technical Specifications

• Working pressure: ≤ 40 MPA

• Operating temperature: -25°C to  +100°C

• Medium: Hydraulic oil or compatible fluids

• Cross-section: O-type or other standards per JB982-77

• Dimensions: Inner diameter: 6–60 mm, Outer diameter: 11.8–74.8 mm, Thickness: 2 mm

• Reusability: Washers can be reused depending on condition

Classification of JB982-77 Combination Washers

1. Metric High-Pressure-Rated Washers:

• Pressure: > 7,000 psi

• Zinc-plated steel for corrosion resistance

• Buna-N rubber seal, abrasion-resistant, reusable

2. Thread-Sealing Washers:

• Under nuts or washers

• Pressure-rated ≥ 2,000 psi

• Robust metal-to-rubber seal

3. Sanitary Washers:

• EPDM seals: FDA-compliant, 3-A certified, NSF/ANSI standards

• Fluoroprene seals: High chemical resistance, suitable for steam sterilization

4. General Metal-Bonded Washers:

• Neoprene or other elastomers for oil and abrasion resistance

• Stainless steel 18-8: Good chemical resistance

• Galvanized steel: Corrosion-resistant

• Aluminum: Lightweight and corrosion-resistant

Advantages of JB982-77 Metal-Bonded Sealing Washers

1. High load capacity: Can withstand extreme pressures and torque.

2. Elasticity & resilience:  Tolerates vibration, thermal expansion, and contraction.

3. Long service life: Resistant to wear, aging, and material degradation.

4. Material compatibility: Suitable for a variety of piping and flange materials.

5. Easy installation: Simple, low-maintenance, cost-effective.

6. Reliable sealing: The metal-rubber combination increases sealing efficiency.

Installation and Usage Guidelines

1. Material selection: Choose metal and rubber types based on environment, pressure, temperature, and media.

2. Uniform force: Apply evenly during installation to avoid deformation or damage.

3. Periodic inspection: Check sealing performance and replace washers if worn or damaged.

Selection principle:

• Room temperature, low pressure: soft rubber washers

• Medium/high pressure, high temperature: metal-rubber combination

• Fluctuating pressure or temperature: elastic or self-tightening washers

• Cryogenic, corrosive, or vacuum: specialized washers with unique properties

Industrial Applications

• Hydraulic valves, cylinders, and pumps

• Pneumatic systems and gear pumps

• Oil line and solenoid valves

• Automotive engines, radiators, and braking systems

• Food machinery, dyeing and finishing machinery

• Aerospace, electronics, air conditioning, and refrigeration systems

• Boilers, pressure drums, diaphragm and vacuum pumps

JB982-77 combination washers are essential for industrial safety, reducing leaks, and maintaining productivity.

Contact Information

For high-quality JB982-77 combination metal-bonded sealing washers, fastener screws, washers, or structural design support, contact:

Email: adelajonly@gmail.com
Website: www.juxinfasteners.com

We provide OEM manufacturing, global supply, and technical support for industrial sealing solutions.