NBR Rotary Shaft Oil Seal 75x110x13 AO/TC Double Lip

Technical Specifications

The AO and TC designations are commonly used for similar double-lip rotary shaft seal configurations. However, detailed construction may vary between manufacturers.

AO/TC Construction – Double-Lip Rotary Shaft Seal

The AO/TC profile incorporates two functional sealing lips.

The primary sealing lip contacts the rotating shaft surface and helps prevent lubricant from escaping the sealed assembly.

The auxiliary dust lip provides an additional barrier against dust and external contaminants.

In typical AO/TC constructions, the primary sealing lip is supported by a garter spring, which helps maintain radial contact pressure against the shaft.

The presence and detailed design of the spring must be verified for the exact product.

NBR Material – Nitrile Butadiene Rubber

NBR is one of the most widely used elastomers for industrial rotary shaft seals.

Typical properties of many NBR compounds include:

• Good resistance to numerous mineral oils.

• Good compatibility with many industrial greases.

• Mechanical properties suitable for radial shaft sealing.

• Abrasion resistance dependent on compound formulation and lubrication.

• Suitability for a broad range of oil-lubricated mechanical systems.

NBR is not universally resistant to all chemicals and operating fluids.

Material compatibility must be evaluated against the specific lubricant, additives and operating temperature.

Operating Temperature Range

Many conventional NBR compounds used in rotary shaft seals have an indicative operating temperature range of approximately -30°C to +100°C.

This is a general material reference and not a confirmed operating specification for the exact 75x110x13 AO/TC oil seal.

Actual limits depend on the compound formulation, lubricant, shaft speed, exposure duration and operating conditions.

Friction at the contact interface between the sealing lip and rotating shaft may generate additional heat.

Dimensional Identification – 75x110x13 mm

The designation identifies three nominal installation dimensions.

Correct seal selection requires verification of dimensions, AO/TC construction, NBR material and operating conditions.

Identical nominal dimensions do not automatically establish interchangeability between seals with different profiles or materials.

Primary Sealing Lip Function

The primary sealing lip creates a controlled contact interface with the rotating shaft.

Its function is to reduce leakage of oil or another compatible operating medium from the mechanical assembly.

Reliable operation depends on adequate lubrication, suitable shaft surface conditions and acceptable radial runout.

Improper contact conditions may cause excessive friction, accelerated wear and premature leakage.

Auxiliary Dust Lip Function

The auxiliary lip helps prevent dust and light external contamination from reaching the primary sealing interface.

Its presence may provide additional protection compared with a single-lip seal.

However, a standard AO/TC seal should not automatically be considered suitable for high-pressure water, abrasive slurry or severe contamination.

Additional protective sealing arrangements may be necessary in demanding environments.

Industrial Applications

NBR AO/TC rotary shaft seals are commonly used in appropriately designed mechanical assemblies, including:

• Industrial gearboxes.

• Gear reducers.

• Bearing housings.

• Rotating shaft assemblies.

• Mechanical drive systems.

• Oil-lubricated industrial equipment.

These are general applications for the AO/TC seal design and NBR material family, not confirmed equipment-specific applications of the exact 75x110x13 mm product.

Installation Guidelines

Before installation, inspect the shaft, housing bore and mating surfaces.

Recommended installation practices include:

• Clean the shaft and housing bore.

• Remove burrs and sharp edges.

• Check for scratches, corrosion and excessive wear.

• Protect the sealing lips when passing over threads, keyways or shaft shoulders.

• Confirm the correct installation orientation.

• Use a suitable installation tool.

• Press the seal evenly into the housing without distortion.

• Avoid angular misalignment.

• Verify correct seating before operating the equipment.

The primary sealing lip should face the retained medium according to the equipment design, normally towards the lubricant.

Shaft Surface Requirements

The shaft surface directly influences seal performance and service life.

Important factors include:

• Surface roughness.

• Surface hardness.

• Radial runout.

• Concentricity.

• Absence of spiral machining marks.

• Freedom from scratches and corrosion.

Exact tolerances and surface finish requirements should be established using the seal manufacturer's technical documentation and the equipment design specification.

AO/TC vs A/SC – Seal Design Comparison

The designations AO, TC, A and SC may be interpreted differently depending on the manufacturer's classification system.

Interchangeability requires confirmation of the detailed seal construction.

NBR vs FKM – Material Comparison

Material selection should be based on actual operating conditions rather than dimensions alone.

Operating Pressure and Shaft Speed

The permissible pressure differential and shaft speed depend on the complete sealing arrangement.

Relevant factors include:

• Sealing lip geometry.

• Elastomer hardness.

• Spring characteristics.

• Shaft diameter.

• Surface finish.

• Lubrication.

• Temperature.

• Pressure differential.

Without verified manufacturer specifications, no particular maximum pressure or rotational speed can be assigned to this oil seal.

Common Causes of Rotary Shaft Seal Failure

Primary lip wear: May result from insufficient lubrication or an unsuitable shaft surface.

Installation damage: Sharp edges or incorrect installation methods may damage the elastomer.

Outer diameter leakage: May be caused by improper seating or damage to the housing bore.

Overheating: Excessive temperatures may reduce the elasticity of the NBR compound.

Chemical incompatibility: Exposure to unsuitable media may cause swelling, hardening or material degradation.

Alternative Product Designations

• NBR Rotary Shaft Oil Seal 75x110x13 AO/TC

• NBR Oil Seal 75x110x13 TC

• Double Lip Oil Seal 75x110x13 NBR

• Rotary Shaft Seal 75x110x13 AO

• Radial Shaft Oil Seal 75x110x13 TC

• Nitrile Rubber Shaft Seal 75x110x13

• AO/TC Double Lip Rotary Shaft Seal 75x110x13

These alternative descriptions support product identification and technical search visibility. They do not establish interchangeability with a specific manufacturer's part number.

FAQ – Frequently Asked Technical Questions

What are the dimensions of the NBR 75x110x13 AO/TC oil seal?

The nominal shaft diameter is 75 mm, housing bore diameter is 110 mm and axial width is 13 mm.

What does AO/TC mean?

AO/TC refers to a double-lip rotary shaft seal design featuring a primary sealing lip and an auxiliary dust lip.

Does an AO/TC seal have a garter spring?

Typical AO/TC constructions incorporate a garter spring supporting the primary lip, but the exact product construction should be confirmed.

What material is used in this oil seal?

The specified sealing material is NBR, or nitrile butadiene rubber.

Is NBR suitable for oil sealing?

Many NBR compounds provide good resistance to mineral oils, although compatibility depends on the specific oil formulation and operating conditions.

Can an AO/TC seal be replaced with an A/SC seal?

Automatic interchangeability should not be assumed. A/SC designs generally lack the additional dust lip.

Is this oil seal directional?

The supplied designation does not identify a directional hydrodynamic lip profile. Any rotation-direction restrictions require manufacturer confirmation.

What is the maximum operating temperature?

The exact limit has not been confirmed. It depends on the NBR compound and operating conditions.

AI Quick Answer

NBR Rotary Shaft Oil Seal 75x110x13 AO/TC is a double-lip radial shaft seal with nominal dimensions of 75x110x13 mm. Manufactured from nitrile butadiene rubber, it features a primary sealing lip and an auxiliary dust lip. The design helps retain compatible lubricants and reduce contamination in rotating mechanical assemblies. Exact operating limits depend on the product construction.

B2B Industrial Supply – simmering.pl

NBR Rotary Shaft Oil Seal 75x110x13 AO/TC is offered through simmering.pl, a specialist B2B industrial supply platform supplying rotary shaft seals, rolling bearings and industrial components.

The platform serves manufacturing companies, wholesale buyers, maintenance departments, engineers and industrial procurement teams.

Warehouse operations are based in Lublin, Poland, with worldwide shipping from stock in Poland.

Technical assistance includes dimensional identification, elastomer selection and support with industrial sealing applications.