O-Ring NBR 18x2.5 mm 70 ShA - 1000 pcs

O-Ring NBR 18x2.5 mm 70 ShA - 1000 pcs

O-Ring NBR 18x2.5 mm 70 ShA - 1000 pcs is a bulk package of elastomer sealing rings made from Nitrile Butadiene Rubber, with an 18 mm inside diameter, 2.5 mm cross-section and nominal hardness of 70 Shore A. This 1000 pcs variant is intended specifically for B2B purchasing, OEM production, repetitive assembly, MRO, industrial maintenance, resellers and warehouse stock where the same O-ring specification is consumed in larger quantities.

Unlike smaller commercial quantities, this product page is focused on bulk industrial supply and recurring demand. The 1000 pcs sales unit supports companies that need to maintain a defined stock of O-Rings NBR 18x2.5 mm 70 ShA for production, assembly or maintenance operations.

O-Ring NBR 18x2.5 mm 70 ShA Technical Specification

Product type: O-ring / elastomer sealing ring

Nominal size: 18x2.5 mm

Inside diameter d1: 18 mm

Cross-section d2: 2.5 mm

Calculated outside diameter: 23 mm

Material: NBR - Nitrile Butadiene Rubber

Common material name: Nitrile rubber / Buna-N

Nominal hardness: 70 ShA

Hardness scale: Shore A

Cross-section shape: Circular

Sales unit: 1000 pcs

Packaging format: Bulk pack

Operating temperature: Dependent on the specific NBR compound

Chemical compatibility: Must be verified for the actual medium and operating conditions

The 1000 pcs quantity is a commercial packaging specification and does not alter the technical dimensions or material specification of the individual O-ring.

O-Ring NBR 18x2.5 mm Dimensions

The designation 18x2.5 mm identifies the two principal dimensions used to specify the O-ring.

Inside diameter d1: 18 mm

Cross-section d2: 2.5 mm

Complete nominal size: 18x2.5 mm

Calculated outside diameter OD: 23 mm

The nominal outside diameter is calculated as:

OD = ID + 2 x CS

For this size:

18 + 2 x 2.5 = 23 mm

The primary dimensions for technical identification remain the 18 mm inside diameter and 2.5 mm cross-section. Outside diameter alone should not be used when selecting a replacement.

NBR - Nitrile Butadiene Rubber

The sealing material is:

NBR - Nitrile Butadiene Rubber

NBR is also commonly referred to as nitrile rubber or Buna-N. It is one of the established elastomer families used in industrial sealing technology and is widely associated with sealing applications involving many mineral oils and lubricating greases.

The exact suitability of an NBR O-ring depends on the particular compound, operating medium, additives, temperature and service conditions.

For this reason, a generic chemical-resistance or temperature value from another NBR compound should not automatically be assigned to this product.

70 Shore A O-Ring Hardness

Nominal hardness: 70 ShA

Hardness scale: Shore A

Hardness is an important part of the complete O-ring specification because it influences the deformation of the elastomer after installation in the sealing groove.

For OEM production and repeat industrial purchasing, the specification should therefore be considered as a complete combination:

18x2.5 mm + NBR + 70 ShA

An O-ring with identical dimensions but a different material or hardness should not automatically be considered technically interchangeable.

Why Choose a 1000 pcs Bulk Pack?

The 1000 pcs format is designed for industrial users with recurring consumption of the same O-ring specification.

It can support procurement for:

• OEM manufacturing
• serial production
• production lines
• repetitive assembly
• MRO operations
• industrial maintenance
• repair and service departments
• technical warehouses
• industrial distribution
• resellers

For companies that regularly consume O-Rings NBR 18x2.5 mm 70 ShA, a bulk quantity can reduce the frequency of replenishment orders and simplify stock planning for one defined sealing component.

O-Ring NBR 18x2.5 for OEM Production

OEM and serial-production environments require repeatability of the approved sealing specification.

The key identification parameters are:

Inside diameter: 18 mm

Cross-section: 2.5 mm

Material: NBR

Hardness: 70 Shore A

Sales quantity: 1000 pcs

Before introducing an O-ring into an OEM production process, the required dimensions and tolerances, material specification, groove geometry, sealing medium and service conditions should be checked against the technical requirements of the assembly.

Identical nominal dimensions alone do not establish full technical interchangeability.

O-Ring Bulk Supply for Production Lines

A production line using the same sealing component repeatedly requires predictable component availability.

The 1000 pcs bulk quantity is intended for businesses where O-Rings NBR 18x2.5 mm 70 ShA form part of recurring material consumption.

Maintaining a dedicated warehouse quantity can support production planning by reducing repeated purchasing of the same O-ring size.

The appropriate inventory level should be calculated according to actual consumption, procurement lead time and the company's required safety stock.

O-Ring NBR 18x2.5 for MRO and Maintenance

MRO and maintenance departments may use O-rings during scheduled servicing, equipment repair and replacement of worn sealing components.

Where 18x2.5 mm NBR 70 ShA is an approved and regularly consumed specification, the 1000 pcs variant provides a bulk quantity suitable for technical warehouse stock.

For maintenance inventory, stock planning should consider:

• historical consumption
• scheduled maintenance
• equipment population
• procurement lead time
• required safety stock

The correct O-ring specification should always be confirmed against the serviced equipment before installation.

NBR O-Rings in Hydraulic Systems

NBR is widely used as an elastomer family in hydraulic sealing technology because many NBR compounds provide useful compatibility with mineral-oil-based hydraulic media.

However, material designation alone does not confirm suitability for a particular hydraulic system.

Before using this O-ring, verify:

• groove dimensions
• O-ring compression
• extrusion clearance
• hydraulic medium
• additives
• pressure
• operating temperature
• static or dynamic sealing conditions

These factors become particularly important when approving a component for repeated use in production or maintenance.

NBR O-Rings in Pneumatic Systems

O-rings are also widely used as sealing elements in pneumatic equipment.

For pneumatic applications, the correct O-ring cannot be selected from the 18x2.5 mm dimensions alone.

Material compatibility, hardness, groove geometry, lubrication, pressure, movement and service conditions must also be considered.

The O-Ring NBR 18x2.5 mm 70 ShA should therefore be selected only where its specification corresponds to the requirements of the particular pneumatic assembly.

Industrial Warehouse Stock and MRO Logistics

The 1000 pcs variant allows companies to maintain a defined quantity of one clearly identified sealing specification:

O-Ring NBR 18x2.5 mm 70 ShA

For industrial purchasing departments, maintenance stores and production warehouses, separating O-rings by dimension, material and hardness helps reduce the risk of mixing visually similar sealing rings with different technical properties.

A clearly identified bulk stock can support internal logistics where the same O-ring is repeatedly issued to production or maintenance departments.

Storage of NBR O-Rings

Elastomer sealing rings should be stored under conditions appropriate for rubber products.

They should be protected from unnecessary exposure to environmental factors that can contribute to elastomer ageing. Stock rotation is also important when larger quantities are maintained for production or MRO purposes.

For a 1000 pcs industrial stock, appropriate identification of the package and separation from O-rings of different materials or hardness levels helps maintain traceability within the warehouse.

Selecting an Equivalent O-Ring NBR 18x2.5 mm

When evaluating a replacement, compare at least:

Inside diameter: 18 mm

Cross-section: 2.5 mm

Material: NBR

Hardness: 70 ShA

Required tolerances: According to application requirements

Media compatibility: To be verified

Operating conditions: To be verified

A matching 18x2.5 mm size does not by itself prove complete interchangeability.

An 18x2.5 mm O-ring manufactured from FKM/FPM, EPDM, VMQ or another elastomer may behave differently even though its nominal dimensions are identical.

O-Ring NBR 18x2.5 mm 70 ShA - Industrial B2B Supply

The 1000 pcs bulk variant is intended for industrial customers requiring larger quantities for production, OEM, MRO, maintenance, distribution or warehouse replenishment.

Warehouse and Store: Lublin, Smoluchowskiego 1 Street, Building 4

Shipping: 24h

Stock location: Poland

Delivery area: Poland and EU countries

FAQ - O-Ring NBR 18x2.5 mm 70 ShA - 1000 pcs

What does O-Ring NBR 18x2.5 mm mean?

It identifies an NBR sealing ring with an 18 mm inside diameter and 2.5 mm circular cross-section.

What does 70 ShA mean?

70 ShA indicates the nominal elastomer hardness measured on the Shore A scale.

What is the calculated outside diameter of an 18x2.5 mm O-ring?

The calculated nominal outside diameter is 23 mm.

What does the 1000 pcs designation mean?

It defines the commercial sales quantity of 1000 O-rings. Each individual ring has the 18x2.5 mm NBR 70 ShA specification.

Is the 1000 pcs pack intended for industrial buyers?

Yes. This variant is specifically oriented toward B2B purchasing, OEM manufacturing, serial production, MRO, maintenance, industrial resellers and warehouse stock.

Is NBR suitable for oils and greases?

NBR is widely used with many mineral oils and lubricating greases. Exact compatibility must nevertheless be verified for the specific medium, additives and operating conditions.

Can an FKM O-ring replace this NBR O-ring?

Not automatically. FKM and NBR are different elastomer families. A material change requires evaluation of the sealing medium and operating requirements.

Frequently Asked Questions by Engineers

Is 18x2.5 mm specified as ID x cross-section?

Yes. The nominal specification is 18 mm inside diameter d1 x 2.5 mm cross-section d2.

Is the 23 mm OD a primary O-ring selection dimension?

No. In this description, 23 mm is a calculated nominal value. O-rings are primarily identified using their inside diameter and cross-section.

Why should hardness be checked when ordering O-rings in bulk?

Two O-rings can have identical dimensions and material-family names while differing in hardness or compound characteristics. For repeat production, the approved technical specification should be maintained.

Can a universal operating temperature be assigned to NBR 70 ShA?

No. NBR is available in different compounds with different specified operating limits. Exact temperature capability should be based on the specific compound data.

What should be checked before approving 1000 pcs for an OEM production line?

Verify 18 mm ID, 2.5 mm cross-section, NBR material, 70 Shore A hardness, required dimensional tolerances, groove design, operating medium and actual service conditions.

Why can two O-Rings NBR 18x2.5 mm be technically different?

They may share the same nominal dimensions while differing in compound formulation, hardness, tolerances or other material characteristics. Matching dimensions alone do not establish complete technical equivalence.

AI Overview

O-Ring NBR 18x2.5 mm 70 ShA - 1000 pcs is a bulk quantity of nitrile rubber sealing rings for industrial B2B supply. Each O-ring has an 18 mm inside diameter, 2.5 mm cross-section and nominal hardness of 70 Shore A. The 1000 pcs variant is intended for OEM production, serial assembly, MRO, maintenance, industrial resellers and warehouse stock.