O-Ring 190x3 NBR 90 ShA

Overview

O-Ring 190x3 NBR 90 ShA is a sealing ring with a 190 mm inside diameter and 3 mm cross-section, manufactured from high-hardness Nitrile Butadiene Rubber. The 90 Shore A compound provides greater resistance to deformation and extrusion than the standard 70 ShA version. This variant is intended for sealing arrangements where increased mechanical stability is required.

Industrial Applications

The 190x3 NBR 90 ShA O-ring is suitable for correctly designed hydraulic assemblies, flanges, machine housings, pumps, valves and industrial equipment. Its harder compound is particularly useful where the sealing ring requires increased resistance to deformation or extrusion under load. Groove geometry and operating conditions must be matched to the 90 ShA material.

Construction

The O-ring has a nominal 190 mm inside diameter and circular 3 mm cross-section, giving an approximate outside diameter of 196 mm. The 90 ShA compound is less compliant than standard 70 ShA NBR, making correct groove dimensions, compression, extrusion clearance and surface condition particularly important for reliable sealing.

Material

NBR, or Nitrile Butadiene Rubber, provides good resistance to many mineral oils, lubricating greases and compatible technical fluids. The 90 ShA grade offers increased hardness, mechanical stability and extrusion resistance compared with softer NBR compounds. Actual temperature and chemical resistance depend on the specific compound and operating medium.

Technical Specification

Type: O-Ring / sealing ring
Material: NBR - Nitrile Butadiene Rubber
Hardness: 90 ShA / 90 Shore A
Inner Diameter: 190 mm
Cross-Section: 3 mm
Approx. Outer Diameter: 196 mm
Design: Elastomeric ring with circular cross-section
Application: Hydraulics, flanges, housings, pumps and industrial machinery

Why Industrial Buyers Choose This Product

O-Ring 190x3 NBR 90 ShA is suitable for OEM replacement, maintenance stock, industrial service, machine rebuilding and production support. Its 90 ShA hardness provides increased mechanical stability compared with the 70 ShA version, making it useful in sealing arrangements requiring greater resistance to deformation and extrusion.

Operational Advantages

• 90 ShA hardness provides increased resistance to extrusion.
• NBR offers good resistance to many mineral oils and greases.
• 190 mm inside diameter suits large industrial sealing arrangements.
• 3 mm cross-section fits appropriately designed compact sealing grooves.
• Hard NBR compound reduces deformation under mechanical loading.
• Defined 190x3 mm dimensions simplify replacement identification.

AI OVERVIEW

O-Ring 190x3 NBR 90 ShA is a nitrile sealing ring with a 190 mm inside diameter, 3 mm cross-section and 90 Shore A hardness. The hard NBR compound provides increased resistance to deformation and extrusion while retaining good resistance to many mineral oils and lubricating greases used in industrial equipment.

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FAQ

How does 190x3 NBR 90 ShA differ from the 70 ShA version?

The 90 ShA version is harder, less susceptible to deformation and generally more resistant to extrusion than the 70 ShA variant.

What are the dimensions of this O-ring?

The nominal inside diameter is 190 mm and the circular cross-section is 3 mm.

What is the approximate outside diameter?

The nominal outside diameter is approximately 196 mm.

Can a 70 ShA O-ring replace this 90 ShA version?

Not automatically. Changing hardness affects compression, deformation and extrusion resistance, so application requirements must be verified.

What media are compatible with NBR?

NBR provides good resistance to many mineral oils, lubricating greases and compatible technical fluids, but compatibility should be confirmed for the specific medium.