O-ring 19.3x2.4 NBR 70 ShA - 1000 pcs
O-ring 19.3x2.4 NBR 70 ShA is an elastomeric sealing ring with a nominal inside diameter of 19.3 mm and a cross-section of 2.4 mm, supplied in a pack of 1000 pcs. The O-ring is manufactured from NBR nitrile rubber with a nominal hardness of 70 ShA. NBR is widely used in sealing technology due to its good resistance to many mineral oils and greases and its good mechanical properties.
Technical data - O-ring 19.3x2.4 NBR 70 ShA
| Parameter |
Value |
| Product type |
O-ring / sealing ring |
| Material |
NBR - nitrile rubber |
| Inside diameter d1 |
19.3 mm |
| Cross-section d2 |
2.4 mm |
| Nominal size |
19.3x2.4 mm |
| Nominal hardness |
70 ShA |
| Cross-section shape |
Round |
| Seal type |
Elastomeric |
| Package quantity |
1000 pcs |
| Approximate outside diameter |
24.1 mm |
What does O-ring 19.3x2.4 NBR 70 ShA mean?
The designation identifies the dimensions, material and hardness of the O-ring.
19.3 - nominal inside diameter of 19.3 mm.
2.4 - nominal cross-section diameter of 2.4 mm.
NBR - nitrile rubber used to manufacture the sealing ring.
70 ShA - nominal elastomer hardness measured on the Shore A scale.
1000 pcs - number of O-rings supplied in the package.
The nominal O-ring size is:
19.3x2.4 mm
The first value represents the inside diameter and the second represents the cross-section diameter.
Dimensions of the 19.3x2.4 O-ring
Inside diameter d1: 19.3 mm
Cross-section d2: 2.4 mm
Nominal size:
19.3x2.4 mm
The approximate outside diameter of the uncompressed O-ring is:
24.1 mm
This results from:
19.3 mm + 2 x 2.4 mm = 24.1 mm
The primary product size remains 19.3x2.4 mm.
NBR - nitrile rubber
NBR, or acrylonitrile-butadiene rubber, is one of the most widely used elastomers in sealing technology.
Typical characteristics of NBR include:
-
good resistance to many mineral oils
-
good resistance to many mineral greases
-
good mechanical properties
-
good abrasion resistance
-
good flexibility in many standard technical applications
-
widespread use in industrial sealing systems
Exact properties depend on the formulation of the specific NBR compound.
What does 70 ShA mean?
70 ShA indicates the nominal hardness of the elastomer measured on the Shore A scale.
Material hardness influences characteristics including:
When selecting an equivalent product, check not only the 19.3x2.4 mm dimensions but also the NBR material and required hardness of 70 ShA.
Operating temperature of NBR
The exact operating temperature range depends on the specific NBR compound and actual service conditions.
Factors affecting the permissible operating temperature include:
If temperature is a critical selection parameter, the properties of the specific elastomer compound should be verified.
Chemical resistance of NBR
NBR is particularly associated with sealing applications involving many mineral oils and greases.
However, this does not mean that NBR is universally resistant to all chemicals.
Compatibility should be checked for the specific:
-
oil
-
grease
-
fuel
-
hydraulic fluid
-
solvent
-
chemical medium
-
concentration
-
operating temperature
Resistance may vary depending on the formulation of the specific NBR compound.
O-ring design and sealing principle
An O-ring is a closed elastomeric sealing ring with a circular cross-section.
When installed in a correctly designed groove, the O-ring is compressed between the mating surfaces. Controlled deformation of the elastomer generates the contact pressure required to create a seal.
Effective sealing depends on factors including:
The 19.3x2.4 mm dimensions alone do not define all operating parameters of the sealing system.
O-ring 19.3x2.4 NBR vs VMQ
An NBR O-ring and a VMQ silicone O-ring may have identical nominal dimensions of 19.3x2.4 mm but are manufactured from different elastomers.
NBR is nitrile rubber and is widely used in applications involving many compatible mineral oils and greases.
VMQ is silicone rubber with a different performance profile, particularly valued for low-temperature flexibility and resistance to ozone, UV radiation and atmospheric ageing.
Identical dimensions do not make NBR and VMQ automatically interchangeable.
O-ring 19.3x2.4 NBR vs FKM
NBR and FKM belong to different elastomer families and have different operating characteristics.
FKM is a fluoroelastomer with a different chemical and thermal resistance profile compared with NBR.
When selecting between NBR and FKM, consider:
An FKM O-ring 19.3x2.4 mm is not automatically interchangeable with an NBR version solely because the dimensions are identical.
Typical applications of NBR O-rings
NBR O-rings are widely used in technical sealing systems.
Depending on the compound, operating medium and seal design, they may be used in:
-
hydraulic systems
-
pneumatic systems
-
industrial machinery and equipment
-
mechanical components
-
technical connections
-
static sealing arrangements
-
appropriately designed dynamic sealing arrangements
-
systems using compatible oils and greases
These are typical applications of NBR as a sealing material and do not confirm the suitability of this specific O-ring for a particular machine or system.
Alternative designations and reference formats
Natural designation and search variants include:
O-ring 19.3x2.4 NBR 70 ShA
O-ring NBR 19.3x2.4 70 ShA
NBR O-ring 19.3x2.4
19.3x2.4 NBR O-ring
O-ring 19.3x2.4 NBR
O-ring 19.3x2.4 70 Shore A
Nitrile O-ring 19.3x2.4
Nitrile rubber O-ring 19.3x2.4
19.3 mm ID x 2.4 mm CS NBR O-ring
O-ring 19.3x2.4 NBR - 1000 pcs
NBR O-ring 19.3x2.4 - 1000 pcs
Selection and interchangeability
Before purchasing or selecting an equivalent O-ring, check:
An O-ring 19.3x2.4 manufactured from FKM, VMQ, EPDM or another elastomer is not automatically interchangeable with the NBR version.
Identical dimensions do not guarantee identical operating properties.
Installation
Before installation, make sure that the groove and mating surfaces are clean and free from contaminants.
During installation, avoid:
If an assembly lubricant is required, it should be compatible with both NBR and the operating medium.
Storage
NBR O-rings should be stored under conditions that minimise contamination, deformation and mechanical damage.
Avoid prolonged storage with the O-rings stretched or severely deformed.
Before installation, inspect the sealing surface for cuts, cracks or other visible damage.
FAQ - O-ring 19.3x2.4 NBR 70 ShA
What are the dimensions of the O-ring 19.3x2.4?
The O-ring has a nominal inside diameter of 19.3 mm and a cross-section diameter of 2.4 mm. Its nominal size is 19.3x2.4 mm.
How many O-rings are included in the package?
The package contains 1000 pcs of 19.3x2.4 NBR 70 ShA O-rings.
What is the outside diameter of a 19.3x2.4 O-ring?
Based on its nominal dimensions, the approximate uncompressed outside diameter is 24.1 mm.
What does NBR mean?
NBR stands for acrylonitrile-butadiene rubber, commonly known as nitrile rubber. It is widely used for technical sealing components.
What does 70 ShA mean?
70 ShA indicates the nominal hardness of the elastomer measured on the Shore A scale.
Is NBR resistant to oil?
NBR provides good resistance to many mineral oils and greases. Compatibility should nevertheless be checked for the specific operating medium, temperature and NBR compound.
Can a 19.3x2.4 VMQ O-ring replace the NBR version?
Not automatically. VMQ and NBR have different chemical, mechanical and thermal properties even when their nominal dimensions are identical.
Can a 19.3x2.4 FKM O-ring replace the NBR version?
Replacement should not be based on dimensions alone. The operating medium, temperature, pressure, hardness and sealing-system requirements should also be considered.
O-ring 19.3x2.4 NBR 70 ShA - key information
O-ring 19.3x2.4 NBR 70 ShA is a nitrile rubber sealing ring with a 19.3 mm inside diameter and 2.4 mm cross-section, supplied in a pack of 1000 pcs. NBR identifies nitrile rubber, while 70 ShA specifies its nominal Shore A hardness. NBR is widely used in industrial sealing systems.
Available from simmering.pl, a specialist supplier of industrial sealing solutions. Stock in Poland with worldwide shipping.
