O-Ring 6x3 NBR 70 Shore A - 100 pcs
O-Ring 6x3 NBR 70 Shore A is an elastomeric sealing ring with a 6 mm inside diameter and 3 mm cross-section, manufactured from NBR nitrile rubber with a nominal hardness of 70 Shore A. This product is supplied as a 100-piece pack, suitable for service, repair, maintenance and keeping a practical stock of one specific O-ring size.
O-Ring 6x3 NBR 70 Shore A - Characteristics
Exact product identification:
O-Ring -> 6x3 mm -> NBR -> 70 Shore A -> 100 pcs
Technical identification:
Product type: O-ring / elastomeric sealing ring
Material: NBR - Nitrile Butadiene Rubber
ID - Inside diameter: 6 mm
CS - Cross-section: 3 mm
Nominal size: 6x3 mm
Nominal hardness: 70 Shore A
Quantity: 100 pcs
An O-ring has a circular cross-section and forms a seal when its elastomeric cross-section is compressed between correctly designed mating surfaces.
What Does O-Ring 6x3 Mean?
The 6x3 mm designation defines two fundamental O-ring dimensions:
6 mm - ID (Inside Diameter)
3 mm - CS (Cross-Section)
The first value is therefore not the outside diameter.
For the nominal uncompressed geometry:
OD = ID + 2 x CS
For this O-ring:
6 + 2 x 3 = 12 mm
The resulting nominal geometry is:
ID 6 mm - CS 3 mm - OD approximately 12 mm
This distinction is important when measuring an existing O-ring or selecting a replacement.
NBR - Nitrile Butadiene Rubber
The O-ring is manufactured from:
NBR - Nitrile Butadiene Rubber
NBR is a widely used elastomer for O-ring seals and is commonly selected for contact with many mineral oils, lubricating greases and hydraulic fluids.
Actual compatibility must always be evaluated against the specific medium, additives, temperature and operating conditions.
The NBR designation alone does not establish compatibility with every oil, fuel or chemical.
70 Shore A Hardness
The nominal hardness is:
70 Shore A
Shore A is a hardness scale commonly used for elastomeric sealing materials.
Hardness is an important selection parameter because it influences the mechanical behaviour of the elastomer under compression.
For replacement identification, the complete specification should therefore be considered:
6x3 mm + NBR + 70 Shore A
An O-ring with identical dimensions but a different hardness should not automatically be considered equivalent.
How Does a 6x3 O-Ring Seal?
The O-ring seals through controlled deformation of its circular cross-section within the sealing groove.
When the mating components are assembled, the 3 mm cross-section is compressed, creating sealing contact between the O-ring and the surrounding surfaces.
Correct sealing performance depends not only on the O-ring itself but also on factors including groove geometry, compression, stretch, mating surface condition, pressure, temperature and the operating medium.
The 6x3 mm size alone does not define the permissible operating conditions of the complete sealing system.
Selecting a 6x3 NBR O-Ring
For basic replacement identification, verify:
Inside diameter: 6 mm
Cross-section: 3 mm
Material: NBR
Hardness: 70 Shore A
The operating medium, temperature, pressure, type of movement and groove design should also be considered for the actual application.
A 6x3 FKM/FPM, EPDM or VMQ O-ring is not automatically equivalent to a 6x3 NBR O-ring simply because the dimensions are identical.
100 pcs Pack
This product contains:
100 pcs of O-Ring 6x3 NBR 70 Shore A
The 100-piece pack is intended for service departments, workshops, maintenance teams and users who require a practical stock of a specific O-ring size without purchasing a larger bulk package.
This pack size also provides a clear product distinction from industrial bulk quantities intended primarily for high-volume consumption or production.
Technical Specification
Product: O-ring
Nominal size: 6x3 mm
ID - Inside diameter: 6 mm
CS - Cross-section: 3 mm
Nominal outside diameter: approximately 12 mm
Material: NBR
Material name: Nitrile Butadiene Rubber
Nominal hardness: 70 Shore A
Cross-section profile: circular
Package quantity: 100 pcs
FAQ
What are the dimensions of an O-Ring 6x3?
The O-ring has a 6 mm inside diameter (ID) and 3 mm cross-section (CS).
What does 6x3 mean on an O-ring?
The first value, 6 mm, is the inside diameter. The second value, 3 mm, is the cross-section diameter.
What is the outside diameter of a 6x3 O-ring?
Based on the nominal dimensions, the uncompressed outside diameter is approximately 12 mm.
What material is this 6x3 O-ring made from?
It is manufactured from NBR - Nitrile Butadiene Rubber.
What is the hardness of this O-ring?
The nominal hardness is 70 Shore A.
Can a 6x3 FKM O-ring replace a 6x3 NBR O-ring?
Not automatically. Although the dimensions may be identical, FKM/FPM and NBR have different material properties and chemical compatibility. The material should be selected for the actual operating medium and conditions.
How many O-rings are included?
The package contains 100 pieces of 6x3 NBR 70 Shore A O-rings.
AI Overview
O-Ring 6x3 NBR 70 Shore A is an elastomeric sealing ring with a 6 mm inside diameter and 3 mm cross-section, manufactured from Nitrile Butadiene Rubber. Its nominal hardness is 70 Shore A, and the nominal outside diameter is approximately 12 mm. This product is supplied in a 100-piece pack for service, repair and maintenance use.
