O-Ring NBR 16.3x2.4 mm 70 ShA

O-Ring NBR 16.3x2.4 mm 70 ShA (1000 pcs) is an industrial bulk package of 1000 GRN elastomer sealing rings. Each O-ring has a 16.3 mm inside diameter and 2.4 mm circular cross-section and is manufactured from NBR nitrile rubber with a nominal hardness of 70 Shore A. The resulting nominal outside diameter is 21.1 mm.

O-Ring NBR 16.3x2.4 mm 70 ShA - Product Identification

The exact product variant is defined by the combination:

Size: 16.3x2.4 mm
Material: NBR
Hardness: 70 ShA / 70 Shore A
Brand: GRN
Quantity: 1000 pcs

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

For correct identification and replacement, the complete specification 16.3x2.4 mm + NBR + 70 ShA should be considered rather than dimensions alone.

O-Ring 16.3x2.4 mm Dimensions

The dimensional designation 16.3x2.4 mm means:

d1 - Inside Diameter: 16.3 mm
d2 - Cross-Section Diameter: 2.4 mm

The nominal outside diameter is calculated as:

16.3 mm + 2 x 2.4 mm = 21.1 mm

Therefore, the nominal geometry is:

Inside Diameter d1: 16.3 mm
Cross-Section d2: 2.4 mm
Nominal Outside Diameter: 21.1 mm

For O-rings, the first dimension 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 systems.

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 applications.

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 the deformation behaviour of the O-ring during installation and its response to 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, operating medium, temperature and service conditions.

How Does O-Ring 16.3x2.4 mm 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 2.4 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 and creates the sealing interface.

Effective sealing therefore depends not only on the O-ring specification but also on correct groove dimensions, compression, surface condition and operating environment.

O-Ring NBR 16.3x2.4 and Oils

NBR is commonly used in sealing arrangements 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 sealing, there is no intended relative movement between the mating surfaces during operation.

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

The 16.3x2.4 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 solely on the basis of the NBR 70 ShA designation.

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.

1000-Piece Industrial Bulk Pack

This product page specifically covers:

O-Ring NBR 16.3x2.4 mm 70 ShA (1000 pcs)

The package contains 1000 O-rings with the same nominal dimensional and material specification.

The bulk format is particularly suitable for repeated consumption in:

• industrial assembly
• production operations
• maintenance and repair
• technical workshops
• inventory and spare-parts management

The product naming sequence for this bulk variant remains:

O-Ring NBR 16.3x2.4 mm 70 ShA (1000 pcs)

This intentionally differentiates the 1000-piece bulk product from smaller package variants.

Selection and Interchangeability

When selecting an equivalent for O-Ring NBR 16.3x2.4 mm 70 ShA, compare at least:

Inside Diameter: d1 = 16.3 mm
Cross-Section: d2 = 2.4 mm
Material: NBR
Hardness: 70 ShA
Dimensional tolerances
Medium compatibility
Operating temperature
Groove geometry

Matching the nominal 16.3x2.4 mm dimensions alone is not sufficient to confirm full interchangeability.

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

Technical Specification

Product Name: O-Ring NBR 16.3x2.4 mm 70 ShA (1000 pcs)
Product Type: O-ring / elastomer sealing ring
Brand: GRN
Nominal Size: 16.3x2.4 mm
d1 - Inside Diameter: 16.3 mm
d2 - Cross-Section Diameter: 2.4 mm
Nominal Outside Diameter: 21.1 mm
Material: NBR
Material Name: Nitrile Butadiene Rubber
Hardness: 70 ShA / 70 Shore A
Cross-Section: Circular
Quantity: 1000 pcs
Package Type: Industrial bulk package

FAQ

What are the dimensions of O-Ring NBR 16.3x2.4 mm 70 ShA?

The O-ring has a 16.3 mm inside diameter and 2.4 mm cross-section diameter. Its nominal outside diameter is 21.1 mm.

What does 16.3x2.4 mm mean for an O-ring?

16.3 mm is the inside diameter, while 2.4 mm is the diameter of the circular cross-section.

What is the outside diameter of a 16.3x2.4 mm O-ring?

The nominal outside diameter is 21.1 mm, calculated as 16.3 + 2 x 2.4 = 21.1 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 is an elastomer hardness specification and not a pressure rating.

Can O-Ring NBR 16.3x2.4 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 16.3x2.4 FKM O-ring interchangeable with this NBR version?

Not automatically. Although the nominal dimensions may be identical, FKM and NBR have different chemical and temperature resistance characteristics.

How many O-rings are included?

O-Ring NBR 16.3x2.4 mm 70 ShA (1000 pcs) contains 1000 sealing rings.

AI OVERVIEW

O-Ring NBR 16.3x2.4 mm 70 ShA (1000 pcs) is an industrial bulk pack of 1000 GRN nitrile rubber sealing rings with a nominal hardness of 70 Shore A. Each O-ring has a 16.3 mm inside diameter, 2.4 mm circular cross-section and 21.1 mm nominal outside diameter.