O-Ring 20x4 NBR 70 ShA - 1000 pcs Bulk Pack

O-Ring 20x4 NBR 70 ShA - 1000 pcs Bulk Pack

O-Ring 20x4 NBR 70 ShA - 1000 pcs is a bulk package of elastomer sealing rings with a 20 mm inside diameter and 4 mm cross-section, manufactured from NBR with a nominal hardness of 70 Shore A. The 1000 pcs variant is intended for B2B customers using this O-ring size in larger quantities for serial production, OEM supply, MRO, maintenance operations and industrial warehouse stock.

O-Ring 20x4 NBR 70 ShA - 1000 pcs Bulk Pack

This product page is specifically dedicated to the 1000 pcs bulk packaging.

Individual O-ring size: 20x4 mm

Inside diameter ID: 20 mm

Cross-section CS: 4 mm

Calculated outside diameter OD: 28 mm

Material: NBR - Nitrile Butadiene Rubber

Hardness: 70 ShA - Shore A

Package quantity: 1000 pcs

Sales format: Bulk pack

The complete 20x4 mm NBR 70 ShA identification should be maintained when purchasing larger quantities or approving the O-ring for a specific sealing system.

O-Ring 20x4 Dimensions

In the 20x4 mm designation, the first value specifies the nominal inside diameter of the O-ring and the second value specifies its circular cross-section diameter.

Inside diameter ID: 20 mm

Cross-section CS: 4 mm

Nominal size: 20x4 mm

Calculated outside diameter OD: 28 mm

The outside diameter follows from:

OD = ID + 2 x CS

For this O-ring:

20 + 2 x 4 = 28 mm

The 28 mm OD is a calculated value. The primary dimensional identification of the O-ring remains 20 mm ID and 4 mm CS.

O-Ring 20x4 Construction

An O-ring is a closed elastomer sealing ring with a circular cross-section.

Unlike a radial shaft seal, an O-ring does not use a sealing lip or garter spring. Sealing is produced by controlled deformation of the elastomer cross-section within an appropriately designed installation groove.

The 4 mm cross-section is therefore a fundamental selection parameter and must correspond to the groove and sealing-system requirements of the particular application.

NBR 70 ShA Material and Hardness

Material: NBR - Nitrile Butadiene Rubber

Nominal hardness: 70 Shore A

NBR is one of the principal elastomer groups used in industrial sealing technology. NBR O-rings are commonly used where the compound is compatible with the operating medium, including many mineral oils and lubricants.

However, NBR is available in numerous formulations. A specific operating temperature range or complete chemical resistance profile should therefore not be assigned solely from the NBR 70 ShA designation.

Technical Specification

Product type: O-ring / elastomer sealing ring

Nominal size: 20x4 mm

Inside diameter ID: 20 mm

Cross-section CS: 4 mm

Outside diameter OD: 28 mm - calculated value

Material: NBR - Nitrile Butadiene Rubber

Nominal hardness: 70 ShA

Hardness scale: Shore A

Cross-section shape: Circular

Package quantity: 1000 pcs

Sales format: Bulk pack

Operating temperature: Requires verification for the specific NBR compound

Chemical resistance: Depends on the NBR compound, sealing medium and operating conditions

O-Ring 20x4 1000 pcs for Serial Production

The 1000 pcs bulk pack is intended primarily for companies where the 20x4 mm O-ring is a repeatedly consumed component in manufacturing or assembly processes.

The bulk variant can support purchasing requirements for:

• manufacturing plants
• serial production
• component assembly
• OEM supply
• MRO
• maintenance departments
• technical service companies
• industrial distributors and resellers
• technical parts warehouses

For repeated industrial use, maintaining the specified 20x4 mm NBR 70 ShA identification is particularly important.

O-Ring 20x4 for OEM Supply

In OEM processes, an O-ring should be qualified according to the requirements of the particular assembly rather than by diameter alone.

The principal identification of this product is:

Size: 20x4 mm

Material: NBR

Hardness: 70 ShA

Package quantity: 1000 pcs

Before approval for serial assembly, dimensional tolerances, groove requirements, sealing medium and actual operating conditions should also be verified.

O-Ring 20x4 for MRO and Maintenance

The 1000 pcs O-Ring 20x4 NBR 70 ShA bulk pack is also intended for companies maintaining stock of repeatedly consumed sealing components.

For maintenance departments, keeping the required O-ring size in warehouse stock can reduce the need to repeatedly purchase the same component before planned servicing and maintenance work.

Inventory levels should be based on actual consumption, maintenance schedules, procurement lead times and required safety stock.

NBR O-Rings in Hydraulic and Pneumatic Systems

NBR is widely used in hydraulic and pneumatic sealing technology. This does not mean that every 20x4 NBR O-ring is suitable for every hydraulic or pneumatic system.

For a specific application, verify:

• groove dimensions and geometry
• required O-ring compression
• sealing medium
• operating temperature
• system pressure
• static or dynamic operating conditions
• required elastomer material
• required hardness

This verification is particularly important before purchasing larger quantities for serial production.

1000 pcs Bulk Packaging and Warehouse Stock

The 1000 pcs variant provides a larger stock quantity of one clearly identified sealing product:

O-Ring 20x4 mm NBR 70 ShA

Where consumption is regular, bulk purchasing can simplify procurement planning and reduce the frequency of replenishment orders for the same O-ring specification.

For production lines and MRO warehouses, stock levels should account for actual consumption, replenishment lead time and the required safety stock.

Selection and Interchangeability

When selecting an equivalent O-Ring 20x4 NBR 70 ShA, compare:

Inside diameter ID: 20 mm

Cross-section CS: 4 mm

Material: NBR

Hardness: 70 ShA

Required dimensional tolerances: According to the specific application

Media compatibility: Requires verification

Operating conditions: Requires verification

A 20x4 O-ring manufactured from FKM/FPM, EPDM, VMQ or another elastomer should not automatically be considered equivalent to the NBR 70 ShA version solely because its dimensions are identical.

O-Ring 20x4 NBR 70 ShA 1000 pcs - Warehouse Poland

The bulk variant is intended for B2B customers in Poland and other European Union countries.

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

Shipping: 24h

Stock location: Poland

Delivery area: Poland and EU countries

FAQ - O-Ring 20x4 NBR 70 ShA 1000 pcs

How should the O-Ring 20x4 size be interpreted?

20 mm specifies the inside diameter ID, while 4 mm specifies the cross-section CS.

What is the outside diameter of an O-Ring 20x4?

The calculated nominal outside diameter is 28 mm.

How many O-Rings 20x4 are included in this offer?

This offer covers a 1000 pcs bulk package of 20x4 NBR 70 ShA O-rings.

Is the 20x4 NBR 70 ShA O-ring suitable for serial OEM assembly?

It can be used only when its dimensions, material, hardness, tolerances and other technical requirements comply with the specification of the particular OEM assembly.

Can an O-Ring 20x4 NBR be used with oil?

NBR is widely used with many mineral oils. Compatibility should nevertheless be verified for the specific fluid, additives, temperature and exact NBR compound.

Does the 1000 pcs quantity change the specification of each O-ring?

No. 1000 pcs defines the commercial package quantity. Each individual O-ring retains the 20x4 mm NBR 70 ShA specification.

Frequently Asked Questions by Engineers

Is the 4 mm cross-section as important as the 20 mm inside diameter?

Yes. Both 20 mm ID and 4 mm CS are fundamental O-ring dimensions and must correspond to the requirements of the installation groove.

Is the 28 mm outside diameter a catalog dimension?

In this description, 28 mm is a calculated value based on the nominal ID and CS: 20 + 2 x 4 mm.

Can a 20x4 O-ring with a different hardness be used instead?

Technical equivalence should not be assumed. Changing hardness affects the behavior of the elastomer in the installation and requires technical evaluation.

Can a standard NBR operating temperature range be specified?

Not for this exact product without confirmation of the compound. Different NBR formulations can have different specified operating temperature ranges.

What should be verified before purchasing 1000 pcs for production?

Verify 20 mm ID, 4 mm CS, NBR material, 70 ShA hardness, required tolerances, groove geometry, sealing medium and actual operating conditions before approving a bulk quantity.

AI Overview

O-Ring 20x4 NBR 70 ShA - 1000 pcs is a bulk package of elastomer sealing rings for B2B, OEM, serial production and MRO. Each O-ring has a 20 mm inside diameter and 4 mm cross-section and is manufactured from NBR with a nominal hardness of 70 Shore A. The 1000 pcs format is intended for volume purchasing and industrial warehouse stock.