EC 32x5 NBR – Rubber-Coated Metal End Cap Seal

EC 32x5 NBR – Rubber-Coated Metal End Cap Seal for Housings

EC 32x5 NBR is a rubber-coated metal end cap seal, also known as an EC/VK sealing cap, designed for static sealing of openings in gearboxes, motors, bearing housings and industrial machinery. It has a nominal outside diameter of 32 mm and an axial width of 5 mm. Its metal-reinforced construction with an NBR (nitrile butadiene rubber) coating provides a sealing interface when correctly installed in a suitable housing bore.

Unlike conventional rotary shaft oil seals, the EC 32x5 NBR end cap has no central opening and is not designed to seal a rotating shaft.

Product Characteristics

The EC 32x5 NBR sealing cap is used where a housing opening must be closed and no rotating shaft passes through it.

Its construction combines a metal reinforcing element with an elastomeric sealing surface.

Key features:

• Product designation: EC 32x5 NBR.

• Profile: EC.

• Alternative profile designation: VK.

• Product type: End cap seal.

• Outside diameter: 32 mm.

• Axial width: 5 mm.

• Sealing material: NBR nitrile rubber.

• Construction: Rubber-coated metal.

• Sealing function: Static.

• Installation: Press-fit into a suitable housing bore.

• Designed to close openings in mechanical housings.

• Helps prevent lubricant leakage and contamination ingress.

Technical Specifications

The exact NBR compound hardness, permissible pressure and operating temperature range depend on the manufacturer and specific product design.

What Does EC 32x5 NBR Mean?

Each part of the designation identifies an important product characteristic.

EC – the sealing end cap profile, designed to close openings in mechanical housings.

32 – nominal outside diameter of 32 mm.

5 – nominal axial width of 5 mm.

NBR – nitrile butadiene rubber, a widely used elastomer in industrial sealing applications.

Important: The 32 mm dimension refers to the outside diameter of the end cap, not the shaft diameter.

Construction of the EC End Cap Seal

EC-type sealing end caps typically feature a metal-reinforced, rubber-coated construction.

The metal component provides structural rigidity, while the NBR elastomer forms the sealing interface between the end cap and the housing bore.

This design offers several functional advantages:

• Stable positioning in a correctly dimensioned housing.

• Accommodation of minor surface irregularities.

• Reduced lubricant leakage through the closed opening.

• Protection against dirt and other contaminants.

• Reliable static sealing under suitable operating conditions.

The EC end cap is not a rolling bearing, retaining ring, O-ring or conventional rotary shaft oil seal.

NBR Material – Properties and Benefits

NBR stands for nitrile butadiene rubber, an elastomer commonly used in mechanical sealing applications.

Its typical properties include:

• Good resistance to many mineral oils.

• Compatibility with numerous industrial greases.

• Elasticity suitable for static sealing.

• Good performance in appropriately selected industrial applications.

• Resistance to many common lubricants.

However, NBR is not universally compatible with every fluid.

Its resistance to fuels, hydraulic fluids, solvents and chemicals depends on the particular compound, operating temperature, concentration and exposure conditions.

What Is an EC 32x5 End Cap Used For?

The EC 32x5 end cap is designed to close a housing opening through which no shaft passes.

Typical applications include:

• Industrial gearboxes.

• Geared motors.

• Electric motors.

• Bearing housings.

• Mechanical drive assemblies.

• Industrial machinery.

• Oil- or grease-lubricated mechanisms.

• Technical openings requiring static sealing.

These are general applications of EC-type sealing end caps. Suitability for a particular machine must be verified using its housing dimensions and operating requirements.

EC End Cap vs Rotary Shaft Oil Seal – What Is the Difference?

An EC sealing cap should not be replaced with a conventional rotary shaft oil seal solely because the outside diameters are similar.

EC 32x5 vs VK 32x5

Technical sealing catalogues may use the designations EC and VK for this family of sealing end caps.

Both terms are associated with components designed to close housing openings.

Before selecting an alternative product, compare:

1. Outside diameter.

2. Axial width.

3. Metal reinforcement geometry.

4. Elastomer coating design.

5. Housing bore dimensions.

6. Sealing material.

7. Operating conditions.

8. Manufacturer-specific tolerances.

Similar profile designations do not automatically guarantee complete interchangeability.

How Does an EC End Cap Provide a Seal?

An EC sealing cap operates through static contact between its outer sealing surface and the housing bore.

When correctly installed, the elastomer coating creates a sealing interface that helps prevent lubricant from escaping through the opening.

The metal reinforcement provides the structural support required to maintain the cap's shape during installation and operation.

Unlike a rotary shaft seal, there is no dynamic sealing lip in contact with a rotating shaft.

This makes the EC end cap suitable for closing unused shaft openings and other appropriately designed housing bores.

Installation Guidelines for EC 32x5 NBR

Correct installation is essential for reliable sealing performance.

Recommended procedure:

1. Clean the housing bore thoroughly.

2. Remove dirt, burrs and foreign particles.

3. Verify the housing bore diameter and installation depth.

4. Inspect the bore for scratches, corrosion or damage.

5. Position the end cap concentrically with the opening.

6. Use a suitable installation tool to apply even pressing force.

7. Avoid striking or damaging the elastomer surface.

8. Check that the end cap is correctly seated after installation.

Installation must follow the equipment manufacturer's requirements.

An incorrectly installed cap may allow lubricant leakage or contamination ingress.

Common Selection Mistakes

When selecting an EC 32x5 NBR sealing cap, avoid the following mistakes:

• Confusing an EC end cap with a rotary shaft oil seal.

• Treating 32 mm as a shaft diameter.

• Ignoring the 5 mm axial width.

• Assuming that all EC and VK caps have identical construction.

• Selecting a replacement based only on nominal outside diameter.

• Assuming that NBR is compatible with every chemical.

• Installing the cap in a damaged or incorrectly sized housing bore.

• Assuming that the end cap is suitable for high-pressure operation without technical confirmation.

Correct identification and dimensional compatibility are essential.

Frequently Asked Questions

What is EC 32x5 NBR?

EC 32x5 NBR is a rubber-coated metal sealing end cap used to close openings in mechanical housings.

What are the dimensions of EC 32x5?

The nominal outside diameter is 32 mm and the axial width is 5 mm.

Is EC 32x5 a rotary shaft oil seal?

No. It is a static sealing end cap, not a conventional rotary shaft oil seal.

Is EC 32x5 an O-ring?

No. An EC end cap has a different construction and sealing function from an O-ring.

What does the EC profile mean?

EC identifies a sealing end cap profile designed to close openings in mechanical housings.

Are EC and VK similar sealing profiles?

Yes. EC and VK are designations used in technical sealing catalogues for families of sealing end caps.

Does the EC end cap have metal reinforcement?

Typical EC end caps feature a metal reinforcing element covered with an elastomeric sealing layer.

What is the purpose of NBR?

NBR provides the elastomeric sealing surface and offers resistance to many oils and greases.

Can EC 32x5 NBR be used in a gearbox?

Yes, provided the housing dimensions, lubricant and operating conditions are compatible with the end cap.

Does the end cap seal a rotating shaft?

No. Its function is to close an opening through which no shaft passes.

Is NBR suitable for contact with oil?

NBR is generally compatible with many mineral oils, but resistance to a specific lubricant must be confirmed.

Can an EC end cap operate under pressure?

Permissible pressure depends on the particular product design and installation conditions. High-pressure suitability should not be assumed without manufacturer documentation.

Can EC 32x5 be replaced with EC 32x7?

Not automatically. The difference in axial width may prevent correct installation.

Does EC 32x5 NBR have a central hole?

No. It is a closed sealing cap designed to cover a housing opening.

What is the difference between a sealing end cap and a bearing cover?

A sealing end cap is specifically designed to provide a sealing function in a housing opening. A bearing cover may have additional structural or mounting functions depending on its design.

Is EC 32x5 NBR suitable for industrial machinery?

It may be used in appropriately designed industrial machinery, provided its dimensions, material and operating conditions match the equipment requirements.

EC 32x5 NBR – Key Technical Information

EC 32x5 NBR is a static sealing end cap with a nominal outside diameter of 32 mm and an axial width of 5 mm. Its rubber-coated metal construction uses NBR elastomer to seal openings in gearboxes, motors and bearing housings. It has no central opening and is not designed for contact with rotating shafts.

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