Simrit Rotary Shaft Seal 90x120x13 COMBI NBR Oil Seal

Simrit Rotary Shaft Seal 90x120x13 COMBI NBR Oil Seal

The Simrit 90x120x13 COMBI NBR is a rotary shaft seal with an inside diameter of 90 mm, outside diameter of 120 mm and width of 13 mm. It combines an oil-retaining sealing function with additional protection against external contamination. The seal is manufactured from NBR (nitrile rubber) and is intended for rotating shaft applications requiring both lubricant retention and contamination protection. The dimensions, COMBI type and NBR material are confirmed for the product listed by simmering.pl.

Technical specification

The product record confirms Simrit as the brand and 90x120x13 mm as the principal dimensions.

What does 90x120x13 COMBI NBR mean?

90x120x13 defines the nominal seal dimensions:

90 mm - shaft diameter / inside diameter.

120 mm - housing bore / outside diameter.

13 mm - seal width.

COMBI identifies a combined sealing design intended not only to retain lubricant on the media side but also to provide increased protection against contamination entering from the external side.

NBR means nitrile butadiene rubber, an elastomer widely used for rotary shaft seals because of its compatibility with many mineral oils and greases and its useful wear characteristics.

COMBI seal design

A COMBI seal is designed for applications where a conventional rotary shaft sealing function must be supplemented by protection against external contaminants.

The construction provides a sealing barrier between the rotating shaft and stationary housing while helping retain oil or grease inside the assembly. The additional protective sealing function helps reduce the ingress of dust, dirt and other contaminants.

This makes the COMBI concept particularly relevant to rotating assemblies exposed to more demanding environmental conditions than a standard protected industrial enclosure.

NBR sealing material

NBR, or nitrile butadiene rubber, is one of the most established elastomers used in industrial rotary shaft sealing.

Its principal advantage in this application is its compatibility with many mineral oils and greases. NBR also provides useful mechanical properties and wear resistance for conventional oil-sealing applications.

Fluid compatibility and operating temperature should nevertheless always be checked for the actual medium and operating conditions. The material designation alone should not be used to determine suitability for every lubricant or chemical.

Simrit 90x120x13 COMBI vs standard rotary shaft seal

The important distinction is the COMBI construction.

A conventional radial shaft seal primarily separates the lubricant side from the external environment. A COMBI design adds an enhanced external protection function, making it particularly useful where the sealing position can be exposed to contamination.

The choice between a standard oil seal and a COMBI seal should therefore not be based solely on the dimensions.

Two seals measuring 90x120x13 mm are not necessarily interchangeable if their profiles, sealing lip arrangements, materials or installation requirements differ.

Alternative designations and search references

This product may naturally be identified or searched for using references such as:

• Simrit 90x120x13 COMBI NBR
• Simrit COMBI 90x120x13
• 90x120x13 COMBI NBR
• COMBI 90x120x13
• 90x120x13 Simrit
• 90x120x13 oil seal
• 90x120x13 rotary shaft seal
• NBR oil seal 90x120x13
• COMBI oil seal 90x120x13
• rotary shaft seal 90x120x13 COMBI

These search forms should not be treated as separate Simrit manufacturer designations.

Selection and interchangeability

Before replacing the Simrit 90x120x13 COMBI NBR seal, verify more than the three principal dimensions.

The 90 mm shaft diameter, 120 mm housing diameter and 13 mm width must match, but the seal profile and COMBI construction are also technically important.

Check the original seal designation, elastomer, lip configuration, shaft condition, housing geometry, rotational speed, operating temperature, lubricant and external contamination level.

A standard 90x120x13 oil seal should therefore not automatically be considered a complete replacement for a 90x120x13 COMBI seal.

Typical application characteristics

The COMBI design is particularly relevant to rotating equipment where lubricant must be retained while the sealing position is exposed to dirt or other environmental contamination.

For this reason, this type of seal can be associated with demanding rotating assemblies such as gearboxes, drive systems, hubs and machinery operating in contaminated environments. The exact suitability for a particular machine should always be confirmed from its technical documentation rather than inferred from dimensions alone.

A 90x120x13 COMBI seal of the same dimensions is also documented in the market for wheel hub and drivetrain-related applications, illustrating the type of environment in which this sealing concept is used.

Installation

Before installation, inspect the shaft sealing surface and housing bore. Both should be clean and free from burrs, corrosion and damage that could affect the sealing lips.

The seal should be installed square to the shaft and pressed into the housing using a suitable installation tool. Avoid direct impacts or deformation of the seal body.

The sealing lip and shaft surface should be handled carefully during assembly. Lubrication and installation conditions should correspond to the requirements of the specific application and sealing material.

FAQ

What are the dimensions of the Simrit COMBI seal?

The seal dimensions are 90x120x13 mm: 90 mm inside diameter, 120 mm outside diameter and 13 mm width.

What material is the Simrit 90x120x13 COMBI made from?

This version is manufactured from NBR (nitrile butadiene rubber).

What does COMBI mean in this rotary shaft seal?

COMBI describes a sealing configuration that combines lubricant retention with additional protection against contamination from the external environment.

Is Simrit 90x120x13 COMBI an oil seal?

Yes. It is a rotary shaft sealing product intended to separate the lubricant side from the external environment. "Oil seal" and "rotary shaft seal" are common technical search terms used for this product category.

Is NBR suitable for mineral oil?

NBR is commonly used with many mineral oils and greases. However, compatibility should always be checked against the exact lubricant, temperature and operating conditions.

Can I replace it with any 90x120x13 oil seal?

Not automatically. Matching 90x120x13 mm dimensions are only part of the selection process. The COMBI profile, material, sealing arrangement and application requirements must also be considered.

What should be checked before ordering?

Verify the dimensions, COMBI construction, NBR material, original seal markings, shaft condition, housing dimensions, lubricant, operating temperature, rotational speed and environmental conditions.

Simrit 90x120x13 COMBI NBR - key information

The Simrit 90x120x13 COMBI NBR is a rotary shaft oil seal with 90 mm inside diameter, 120 mm outside diameter and 13 mm width. Its COMBI construction combines lubricant retention with additional external contamination protection, while the NBR elastomer is suitable for many conventional mineral-oil and grease applications.

Available from simmering.pl, with stock in Poland and worldwide shipping. The current simmering.pl product record identifies the item as Simrit reference 90X120X13 SIMRIT.