O-Ring NBR 18x4 mm

Applications

Key Benefits

Technical Data & Specifications

Main Description

Our O-Ring 18x4 NBR 70 ShA is a high-performance nitrile (NBR) rubber sealing ring designed for a variety of industrial, hydraulic, and pneumatic sealing applications. Supplied in a bulk pack of 1000 pieces, this O-ring provides excellent value and consistency for large-scale maintenance, production, or OEM usage.

Applications

This nitrile O-ring is ideally suited for static and low-dynamic sealing environments such as hydraulic and pneumatic systems, valve assemblies, pumps, fluid connectors, and industrial machinery. Thanks to its 70 Shore A hardness, it offers a reliable seal without sacrificing flexibility — making it well-suited for oil or fuel systems, lubricated environments, and general industrial fluid handling.

Key Benefits

• Oil and Chemical Resistance: Made from NBR (nitrile butadiene rubber), this O-ring exhibits strong resistance to mineral oils, greases, fuels, and many industrial fluids.

• Balanced Hardness: At 70 ShA, provides optimal flexibility, compression set resistance, and long-term durability.

• Cost Efficiency: Sold in a bulk pack of 1,000 units — ideal for procurement departments, OEMs, service shops, or maintenance teams.

• Consistent Quality: Uniform material properties ensure each sealing ring meets rigorous industrial standards.

• High Compatibility: With an 18 mm inner diameter and 4 mm cross-section, it fits common metric grooves used in flange, cover, or static sealing.

Technical Data & Specifications

• Material: NBR (nitrile butadiene rubber)

• Hardness: 70 Shore A

• Dimensions: Inner Diameter 18 mm x Cross-Section 4 mm

• Operating Temperature Range: Typically - 30 °C to +100 °C (depending on media and conditions)

• Resistance: Oils, fuels, greases, hydraulic fluids

• Pack Size: 1000 pcs for bulk purchasing

• Package Origin: Shipped from our warehouse at Lublin, ul. Smoluchowskiego 1, building 4

• Delivery: 24 h dispatch for fast order fulfillment

This sealing ring is engineered for industrial-grade performance: its toroidal geometry conforms to standard grooves, achieving high-quality static sealing with minimal leakage. In design systems, the correct groove dimensions and compression (squeeze) are critical: typical static applications call for 15-25% compression to maintain long-term sealing reliability.

FAQ

Q1: What does “70 ShA” mean, and why is it important?
A1: “70 ShA” refers to the hardness of the rubber measured on the Shore A scale. At 70, the material offers a good balance between elasticity and mechanical strength — ideal for durable, oil-resistant sealing.

Q2: Is this O-Ring suitable for dynamic (moving) applications?
A2: While primarily designed for static and low-movement sealing tasks (e.g., flange or cover seals), with appropriate groove design and lubrication, it may be used in low-speed reciprocating systems. For high-speed rotary motion, consider more specialized elastomers or designs.

Q3: Can these O-rings handle high pressures?
A3: Yes, when used in proper gland design with correct compression and back-up rings if needed, NBR O-rings are effective in many hydraulic and pneumatic systems. Wikipedia

Q4: What temperature range can this sealing ring tolerate?
A4: The NBR 70 ShA material typically supports service between approximately -30 °C and +100 °C, depending on fluid media and operating conditions.

Q5: Why should I buy in a pack of 1,000?
A5: Bulk purchasing reduces the per-unit cost, ensures inventory consistency for maintenance or production teams, and simplifies procurement for large-scale operations.