O-Ring 19x5 NBR 70 ShA

O-Ring 19x5 NBR 70 ShA (100 pcs) is a package of 100 GRN elastomer sealing rings with a 19 mm inside diameter and 5 mm circular cross-section. The O-rings are manufactured from NBR nitrile rubber with a nominal hardness of 70 Shore A. For the 19x5 mm geometry, the resulting nominal outside diameter is 29 mm.

O-Ring 19x5 NBR 70 ShA - Product Characteristics

This product variant is defined by:

Size: 19x5 mm
Material: NBR
Hardness: 70 ShA / 70 Shore A
Brand: GRN
Quantity: 100 pcs

An O-ring is a closed elastomer sealing element with a circular cross-section. Its sealing function is generated by controlled deformation after installation in a correctly dimensioned groove.

For correct identification and replacement, the complete combination 19x5 mm + NBR + 70 ShA should be considered rather than dimensions alone.

O-Ring 19x5 mm Dimensions

The dimensional designation 19x5 mm means:

d1 - Inside Diameter: 19 mm
d2 - Cross-Section Diameter: 5 mm

The nominal outside diameter is calculated as:

19 mm + 2 x 5 mm = 29 mm

Therefore:

Inside Diameter d1: 19 mm
Cross-Section d2: 5 mm
Nominal Outside Diameter: 29 mm

For O-rings, the first value specifies the inside diameter, while the second specifies the diameter of the circular cross-section.

NBR - Nitrile Butadiene Rubber

NBR (Nitrile Butadiene Rubber) is one of the most widely used elastomers in technical sealing applications.

NBR is commonly selected for compatibility with many mineral oils, mineral greases and mineral-oil-based hydraulic fluids. These properties make nitrile rubber relevant to many mechanical, hydraulic and pneumatic sealing systems.

NBR should not, however, be considered universally resistant to every fluid or chemical.

For a specific application, compatibility should be evaluated against the actual operating medium, temperature, exposure duration and service conditions.

70 ShA Hardness

The designation 70 ShA specifies a nominal elastomer hardness of 70 Shore A.

Hardness influences how the O-ring deforms during installation and behaves under compression within the sealing groove.

The value 70 ShA is not a pressure rating. Permissible operating pressure depends on the complete sealing arrangement, including groove geometry, extrusion gap, temperature, medium and operating conditions.

How Does O-Ring 19x5 NBR Work?

The sealing function is generated through controlled compression of the circular elastomer cross-section.

For this O-ring, the nominal cross-section diameter is 5 mm.

When installed in a correctly designed groove, the elastomer is compressed between the mating surfaces. Its elastic deformation generates contact pressure against these surfaces, creating the sealing interface.

Effective sealing therefore depends on both the O-ring specification and the design of the complete sealing arrangement.

O-Ring NBR 19x5 and Oils

NBR is commonly used in sealing systems involving many mineral oils and mineral greases.

However, describing NBR as oil resistant does not mean that it is compatible with every lubricant, hydraulic fluid or fuel.

The exact fluid formulation, additives and operating temperature should be considered when selecting the sealing material.

For critical applications, compatibility should be verified against the specific operating medium.

Static and Dynamic Sealing

O-rings are widely used in static sealing arrangements and may also be used in appropriately engineered dynamic applications.

In static applications, there is no intended relative movement between the mating sealing surfaces.

Dynamic applications introduce additional factors including friction, lubrication, movement speed, surface finish and wear.

The 19x5 mm, NBR and 70 ShA specification alone therefore does not confirm suitability for every dynamic application.

Operating Temperature - Selection Note

A universal operating temperature range should not be assigned to this GRN O-ring based solely on the designation NBR 70 ShA.

Actual temperature capability depends on the exact NBR compound, operating medium, exposure duration and service conditions.

For critical installations, the permitted temperature range should therefore be verified for the specific elastomer compound.

100-Piece Package

This product page specifically covers:

O-Ring 19x5 NBR 70 ShA (100 pcs)

The package contains 100 O-rings with the same nominal dimensional and material specification.

This package format is suitable for repeated use in assembly, maintenance, service operations and technical inventory.

The product naming sequence for this variant remains:

O-Ring 19x5 NBR 70 ShA (100 pcs)

Selection and Interchangeability

When selecting an equivalent for O-Ring 19x5 NBR 70 ShA, compare:

Inside Diameter: d1 = 19 mm
Cross-Section: d2 = 5 mm
Material: NBR
Hardness: 70 ShA
Dimensional tolerances
Medium compatibility
Operating temperature
Groove geometry

Matching the nominal 19x5 mm dimensions alone is not sufficient to confirm full interchangeability.

An O-ring manufactured from FKM, EPDM or VMQ can have identical nominal dimensions but different chemical and thermal characteristics.

Technical Specification

Product Name: O-Ring 19x5 NBR 70 ShA (100 pcs)
Product Type: O-ring / elastomer sealing ring
Brand: GRN
Nominal Size: 19x5 mm
d1 - Inside Diameter: 19 mm
d2 - Cross-Section Diameter: 5 mm
Nominal Outside Diameter: 29 mm
Material: NBR
Material Name: Nitrile Butadiene Rubber
Hardness: 70 ShA / 70 Shore A
Cross-Section: Circular
Quantity: 100 pcs

FAQ

What are the dimensions of O-Ring 19x5 NBR 70 ShA?

The O-ring has a 19 mm inside diameter and 5 mm cross-section diameter. Its nominal outside diameter is 29 mm.

What does 19x5 mm mean for an O-ring?

19 mm is the inside diameter, while 5 mm is the diameter of the circular cross-section.

What is the outside diameter of a 19x5 mm O-ring?

The nominal outside diameter is 29 mm, calculated as 19 + 2 x 5 = 29 mm.

What does NBR mean?

NBR means Nitrile Butadiene Rubber, an elastomer widely used in technical sealing applications.

What does 70 ShA mean?

70 ShA specifies a nominal hardness of 70 on the Shore A scale. It describes elastomer hardness and is not a pressure rating.

Can O-Ring 19x5 NBR be used with oil?

NBR is compatible with many mineral oils and greases. Suitability should still be verified for the exact operating fluid, additives and temperature.

Is a 19x5 FKM O-ring interchangeable with this NBR version?

Not automatically. The dimensions may be identical, but FKM and NBR have different chemical and temperature resistance characteristics.

How many O-rings are included?

O-Ring 19x5 NBR 70 ShA (100 pcs) contains 100 sealing rings.

AI OVERVIEW

O-Ring 19x5 NBR 70 ShA (100 pcs) is a pack of 100 GRN nitrile rubber sealing rings with a nominal hardness of 70 Shore A. Each O-ring has a 19 mm inside diameter, 5 mm circular cross-section and 29 mm nominal outside diameter.