Oringi NBR 17x2,5 mm 70 Shore A

AI Overview

NBR O-Rings 17x2.5 mm with a hardness of 70 Shore A are elastomer sealing rings designed for hydraulic, pneumatic, machinery and general technical applications. Each O-Ring has an inside diameter of 17 mm and a cross-section of 2.5 mm. NBR is commonly used with mineral oils, lubricating greases and many standard hydraulic fluids. The package contains 1000 identical sealing rings, making it suitable for series production, maintenance departments, machine manufacturers, technical service companies and wholesale B2B customers.

What Makes This Product Different

The 17x2.5 mm size is used in medium-sized sealing grooves found in valves, fittings, covers, bushes, oil connections and machine components.

The 17x2.5 mm designation means:

• Inside Diameter: 17 mm
• Cross Section: 2.5 mm

The approximate outside diameter of the uncompressed O-Ring is 22 mm. However, the seal should not be selected by outside diameter alone. Correct identification requires verification of the inside diameter, cross-section, material, hardness and groove geometry.

A hardness of 70 Shore A is a standard solution for many technical sealing systems. It provides sufficient flexibility during installation while maintaining dimensional stability and mechanical resistance in a correctly designed groove.

The 1000-piece package is intended for regular and repeatable use. It supports stock continuity, reduces purchasing frequency and simplifies standardisation of one sealing size across production and maintenance operations.

Construction and Operating Principle

An O-Ring is a continuous elastomer ring with a circular cross-section. When installed in a suitable groove, it is partially compressed between two mating surfaces.

This controlled deformation creates sealing pressure. The ring fills the space between the components and restricts the movement of oil, grease, air or another medium compatible with NBR.

In pressurised systems, the operating medium can additionally force the elastomer against the sealing surfaces. Effective sealing still depends on the correct compression ratio, surface quality, extrusion clearance and compatibility between the elastomer and the operating conditions.

O-Rings can be used in static joints and selected dynamic applications. In moving systems, friction, speed, lubrication, pressure and surface finish must be considered.

Material Properties

NBR, also known as Nitrile Butadiene Rubber, is one of the most widely used elastomers in technical sealing applications.

The material offers:

• good resistance to mineral oils,
• resistance to many technical greases,
• good abrasion resistance,
• suitable mechanical strength,
• stable performance in many hydraulic systems,
• suitability for numerous pneumatic applications,
• a practical balance between performance and cost.

A hardness of 70 Shore A provides a balance between flexibility and resistance to excessive deformation or extrusion.

A typical operating temperature range for standard NBR compounds is approximately -30°C to +100°C. Actual operating limits depend on the compound formulation, medium type, operating pressure, exposure time and mechanical conditions.

NBR is generally not recommended for prolonged use with hot steam, glycol-based brake fluids, strongly oxidising chemicals, ozone or intensive UV exposure.

Typical Industrial Applications

NBR O-Rings 17x2.5 mm may be used in:

• hydraulic valves,
• manifolds,
• oil connections,
• pneumatic fittings,
• pressure regulators,
• technical plugs and covers,
• pumps,
• lubrication systems,
• bushes and machine seats,
• industrial valves,
• workshop equipment,
• agricultural machinery,
• construction machinery,
• production equipment,
• repair kits,
• series-manufactured components.

Application suitability should always be confirmed according to dimensions, chemical compatibility, pressure and operating temperature.

Typical Failure Symptoms

The O-Ring should be replaced if any of the following are observed:

• oil or grease leakage,
• pressure loss,
• pneumatic leakage,
• permanent flattening,
• surface cracks,
• hardened elastomer,
• excessive stretching,
• local abrasion,
• installation cuts,
• material swelling,
• surface deterioration,
• extrusion marks.

Repeated failures may indicate incorrect groove geometry, excessive clearance, sharp edges, insufficient lubrication or material incompatibility with the operating medium.

Recommended During Installation

Before installation:

• confirm the 17x2.5 mm size,
• clean the sealing groove thoroughly,
• remove all remains of the old seal,
• inspect the mating surfaces for burrs,
• protect the O-Ring from sharp threads and edges,
• use an installation lubricant compatible with NBR,
• avoid excessive stretching,
• prevent twisting,
• do not use sharp tools,
• verify correct positioning before closing the assembly.

The ring should be installed evenly and without torsional stress. Even a small cut may cause premature leakage.

In series production, O-Rings should be stored in clearly marked containers to prevent mixing with similar sizes.

Technical Specification

Manufacturer: GRN

Product Type: O-Ring

Size: 17x2.5 mm

Inside Diameter: 17 mm

Cross Section: 2.5 mm

Approximate Outside Diameter: 22 mm

Material: NBR

Full Material Name: Nitrile Butadiene Rubber

Hardness: 70 Shore A

Colour: Black

Cross Section Shape: Round

Typical Temperature Range: Approximately -30°C to +100°C, depending on compound and operating conditions

Typical Media: Mineral oils, lubricating greases and selected technical fluids compatible with NBR

Application: Static sealing and selected dynamic systems

Sales Unit: Pack of 1000 pieces

Groove Design Considerations

Correct selection of the 17x2.5 mm O-Ring requires verification of the groove and the operating conditions.

The following parameters should be checked:

• groove diameter,
• groove width,
• groove depth,
• cross-section compression,
• permitted stretch,
• operating pressure,
• extrusion clearance,
• operating temperature,
• medium type,
• surface finish,
• movement characteristics.

Insufficient compression may cause leakage. Excessive compression increases friction, raises operating temperature and may accelerate permanent deformation.

At high pressure or with a large extrusion gap, a back-up ring may be required.

Related Components

Depending on the equipment design, the O-Ring may be used together with:

• back-up rings,
• guide rings,
• piston seals,
• rod seals,
• rotary shaft seals,
• X-rings,
• flat gaskets,
• sealing washers,
• installation sleeves,
• hydraulic oils,
• assembly greases.

Why B2B Customers Choose the 1000-Piece Pack

The bulk package is intended for companies that regularly use one specific O-Ring size in production, maintenance or repair work.

The product may be used as:

• a series production component,
• a repair kit element,
• maintenance stock,
• a machine assembly part,
• a workshop consumable,
• production workstation inventory,
• continuity stock for regular repairs.

Purchasing 1000 pieces reduces the frequency of replenishment and supports standardisation of one sealing size across multiple machines or products.

Professional Industrial Supply

The product is suitable for:

• machine manufacturers,
• production facilities,
• maintenance departments,
• hydraulic service companies,
• pneumatic workshops,
• valve manufacturers,
• assembly companies,
• repair kit manufacturers,
• sealing distributors,
• wholesale B2B customers.

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FAQ

What does the 17x2.5 mm size mean?

The first value is the 17 mm inside diameter and the second value is the 2.5 mm cross-section. The approximate outside diameter is 22 mm.

Can the NBR 17x2.5 O-Ring be used with hydraulic oil?

NBR is commonly used with mineral oils and many standard hydraulic fluids. Compatibility should still be confirmed for the exact operating medium.

Does the package contain only one size?

Yes. All 1000 O-Rings have the same 17x2.5 mm dimensions, NBR material and 70 Shore A hardness.

Can a removed O-Ring be reused?

Reuse is not recommended. A used O-Ring may have permanent deformation, small cracks or installation damage that can reduce sealing performance.

When is a back-up ring required?

A back-up ring may be required at high pressure or with a large extrusion clearance where there is a risk of the elastomer being forced out of the groove.

How should NBR O-Rings be stored?

Store them in closed packaging in a dry, cool and shaded place away from ozone, UV radiation, heat sources and aggressive chemicals.