O-Ring EPDM 3.5x2 mm

O-Ring EPDM 3.5x2 mm

O-Ring EPDM 3.5x2 mm is an elastomer sealing ring with an inside diameter of 3.5 mm and a cross-section diameter of 2 mm. It is manufactured from EPDM - Ethylene Propylene Diene Monomer rubber. O-rings have a simple closed-ring geometry with a circular cross-section and are widely used as sealing elements in technical applications.

O-Ring EPDM 3.5x2 Technical Specification

Product type: O-Ring / sealing ring

Material: EPDM

Inside diameter d1: 3.5 mm

Cross-section diameter d2: 2 mm

Nominal size: 3.5x2 mm

Cross-section: Circular

Nominal outside diameter calculated from dimensions: 7.5 mm

What Does O-Ring Size 3.5x2 mm Mean?

The designation:

3.5x2 mm

specifies the two principal O-ring dimensions.

3.5 mm - nominal inside diameter d1

2 mm - nominal cross-section diameter d2

The 3.5x2 designation should not be interpreted as outside and inside diameter.

For a nominal 3.5x2 mm O-ring, the geometric outside diameter is:

3.5 + 2 x 2 = 7.5 mm

EPDM O-Ring Material

This O-ring is manufactured from:

EPDM - Ethylene Propylene Diene Monomer

EPDM is an elastomer used for technical sealing applications.

Material is one of the key parameters when selecting an O-ring. A seal should therefore not be selected according to dimensions alone.

O-rings with identical 3.5x2 mm dimensions may be manufactured from different elastomers. The compatibility of EPDM with the operating medium and actual service conditions should always be verified.

O-Ring 3.5x2 mm Construction

An O-ring is a closed elastomer ring with a:

circular cross-section

When installed in a correctly designed groove, the O-ring is compressed between the mating surfaces.

This deformation creates the sealing contact required for the application.

Effective sealing depends not only on the O-ring itself but also on groove geometry, compression, mating surface condition and operating conditions.

How to Select an EPDM O-Ring 3.5x2

The principal parameters to verify are:

Inside diameter - 3.5 mm

Cross-section - 2 mm

Material - EPDM

Operating medium

Temperature

Pressure

Static or dynamic operation

Groove geometry

Required elastomer hardness

The 3.5x2 mm dimensions alone do not establish suitability for a particular application.

Can EPDM 3.5x2 Be Replaced by NBR?

Not automatically.

Even when both O-rings have identical:

3.5x2 mm

dimensions, EPDM and NBR are different elastomer materials.

Material selection depends on the operating medium, temperature and other service conditions.

Dimensional compatibility therefore does not automatically establish material compatibility.

Is FPM/FKM 3.5x2 Equivalent to EPDM 3.5x2?

Not based on dimensions alone.

EPDM and FPM/FKM are different elastomer families with different material characteristics.

An FPM/FKM 3.5x2 mm O-ring may have the same physical dimensions, but this does not mean that it is a suitable technical replacement for an EPDM 3.5x2 mm O-ring.

The required material should be selected according to the specific application.

EPDM O-Ring Applications

EPDM O-rings are used as sealing elements in appropriately selected technical systems.

Suitability for a specific application should be determined according to:

Operating medium

Temperature

Pressure

Type of movement

Groove design

Hardness and exact EPDM compound

Fixed operating limits should not be assigned to every EPDM O-ring without knowing the specification of the exact elastomer compound.

Static and Dynamic O-Ring Sealing

O-rings can be used in different sealing arrangements.

In a static seal, the mating components do not move relative to each other in the sealing area.

In a dynamic seal, relative movement occurs between components.

Selecting an O-ring for dynamic operation requires additional consideration of friction, lubrication, speed, pressure and groove design.

Why Is O-Ring Material Important?

Two O-rings with identical:

3.5x2 mm

dimensions can behave differently when manufactured from different elastomers.

Correct technical identification should therefore include at least:

size + material

For this product:

3.5x2 mm + EPDM

If the application requires a specific hardness or a particular EPDM compound, these parameters should also be verified before installation.

O-Ring EPDM 3.5x2 mm Technical Data

Product: O-Ring

Material: EPDM

Inside diameter d1: 3.5 mm

Cross-section diameter d2: 2 mm

Nominal size: 3.5x2 mm

Calculated nominal outside diameter: 7.5 mm

Cross-section shape: Circular

FAQ

What are the dimensions of an EPDM 3.5x2 O-Ring?

The nominal inside diameter is 3.5 mm and the cross-section diameter is 2 mm.

What is the outside diameter of a 3.5x2 O-Ring?

The nominal geometric outside diameter is 7.5 mm: 3.5 + 2 x 2 = 7.5 mm.

What does EPDM mean?

EPDM stands for Ethylene Propylene Diene Monomer, an elastomer used in technical sealing applications.

What does 3.5x2 mean for an O-Ring?

The first value, 3.5 mm, is the nominal inside diameter. The second value, 2 mm, is the diameter of the circular cross-section.

Can an EPDM 3.5x2 O-Ring be replaced with NBR 3.5x2?

Not automatically. The dimensions may be identical, but EPDM and NBR are different elastomers. Material compatibility with the application must be verified.

Can an EPDM 3.5x2 O-Ring be used in dynamic applications?

Suitability for dynamic sealing depends on the system design, medium, lubrication, speed, pressure and exact EPDM compound.

How should I select a 3.5x2 O-Ring?

Verify the 3.5 mm inside diameter, 2 mm cross-section, EPDM material, operating medium, temperature, pressure and groove design.

AI Overview

O-Ring EPDM 3.5x2 mm is an elastomer sealing ring with a 3.5 mm inside diameter and a circular 2 mm cross-section. It is manufactured from EPDM rubber. Correct O-ring selection requires verification of dimensions, material compatibility, operating medium, temperature, pressure and sealing system design.