Rotary Shaft Seal 330x370x18 NBR TC Oil Seal Double Lip GRN®

GRN® Rotary Shaft Seal 330x370x18 NBR TC - Double Lip Oil Seal

GRN® Rotary Shaft Seal 330x370x18 NBR TC is a large-diameter, double-lip radial shaft seal with dimensions 330x370x18 mm. Manufactured from NBR (Nitrile Butadiene Rubber), it features a spring-loaded primary sealing lip, an additional dust lip and a rubber-covered outside diameter. The TC double-lip design combines the primary sealing function with additional protection against external contamination.

Technical data

330x370x18 mm dimensions

The designation 330x370x18 mm defines:

330 mm - nominal shaft diameter
370 mm - nominal housing bore diameter
18 mm - seal width

This is a large-diameter rotary shaft seal. When selecting a replacement, the dimensions should be checked together with the NBR material, double-lip configuration and outside diameter construction.

What does NBR TC mean?

The designation identifies the material and construction of the seal.

NBR means Nitrile Butadiene Rubber, one of the most widely used elastomers in rotary shaft sealing technology.

TC identifies a double-lip construction incorporating:

• a spring-loaded primary sealing lip
• an additional secondary dust lip
• a rubber-covered outside diameter

For this product, the original AO construction functionally corresponds to the commonly used international TC configuration.

AO vs TC

Rotary shaft seal designation systems are not completely standardized between manufacturers.

For this product, AO describes a construction functionally corresponding to the commonly used TC design: a spring-loaded primary sealing lip, an additional dust lip and a rubber-covered outside diameter.

For international product presentation, the recommended designation is:

GRN® Rotary Shaft Seal 330x370x18 NBR TC - Double Lip Oil Seal

AO and TC should not be treated as universally identical manufacturer codes. When selecting an equivalent seal, the actual construction should always be verified.

Double-lip construction

The GRN® 330x370x18 NBR TC incorporates two lips with different functions.

The primary sealing lip operates directly against the rotating shaft surface. A garter spring helps maintain contact between the sealing edge and the shaft.

The additional dust lip is positioned towards the external environment and provides an extra barrier against dust and other contaminants approaching the primary sealing area.

NBR - Nitrile Butadiene Rubber

NBR (Nitrile Butadiene Rubber) is one of the most commonly used elastomers for rotary shaft seals.

It is widely used in sealing applications involving mineral oils and greases. Actual suitability depends on the specific medium and operating conditions.

The sealed medium, operating temperature, shaft surface speed and environmental conditions should therefore be considered when selecting an NBR oil seal.

TC vs SC rotary shaft seal

The key difference is the presence of an additional dust lip.

TC - double-lip construction with a spring-loaded primary sealing lip and an additional dust lip.

SC - single-lip construction with a spring-loaded primary sealing lip and no additional dust lip.

A 330x370x18 TC seal and a 330x370x18 SC seal can have identical basic dimensions but different sealing constructions. They should not automatically be considered interchangeable.

Function of the 330x370x18 NBR TC seal

A rotary shaft seal operates between a rotating shaft and a stationary housing.

The primary sealing lip helps retain a compatible lubricant or other medium within the operating area. The additional dust lip helps reduce the ingress of external contaminants towards the primary sealing zone.

With dimensions of 330x370x18 mm, this is a large-diameter rotary shaft seal. The exact application should be confirmed using machine documentation or the dimensions and construction of the original seal.

Alternative designations and search references

This product may also be encountered under the following descriptions:

• GRN Rotary Shaft Seal 330x370x18 NBR TC
• Rotary Shaft Seal 330x370x18 NBR TC GRN
• GRN Oil Seal 330x370x18 NBR TC
• Oil Seal 330x370x18 NBR TC
• 330x370x18 NBR AO
• 330x370x18 NBR TC
• NBR Oil Seal 330x370x18
• Double Lip Oil Seal 330x370x18
• Shaft Seal 330x370x18 NBR TC

These alternative descriptions are useful for product identification and search. Replacement selection should always be based on the actual dimensions and construction.

Selecting a GRN® 330x370x18 NBR TC seal

Before ordering, verify:

• shaft diameter 330 mm
• housing bore diameter 370 mm
• width 18 mm
• NBR elastomer
• AO/TC double-lip construction
• spring-loaded primary sealing lip
• additional dust lip
• rubber-covered outside diameter
• sealed medium
• operating temperature
• shaft surface speed
• shaft sealing surface condition
• requirements of the specific sealing arrangement

Matching the 330x370x18 mm dimensions alone does not guarantee full interchangeability.

Installation

Before installation, thoroughly clean the shaft and housing bore. The shaft surface in contact with the primary sealing lip should be free from sharp edges, burrs and damage.

The seal should be pressed evenly into the housing around its entire circumference without tilting or deformation. Uniform installation is particularly important for large-diameter rotary shaft seals.

The spring-loaded primary sealing lip should normally face the medium to be retained.

FAQ - GRN® Rotary Shaft Seal 330x370x18 NBR TC

What are the dimensions of this GRN® oil seal?

The dimensions are 330x370x18 mm: 330 mm shaft diameter, 370 mm outside diameter and 18 mm width.

Is the 330x370x18 TC a double-lip oil seal?

Yes. The TC construction features a spring-loaded primary sealing lip and an additional dust lip.

What material is the seal made from?

The sealing element is manufactured from NBR (Nitrile Butadiene Rubber).

What does TC mean?

For this product, TC identifies a double-lip construction with a spring-loaded primary sealing lip, an additional dust lip and a rubber-covered outside diameter.

What is the purpose of the additional dust lip?

It provides an additional barrier that helps reduce the ingress of dust and other external contaminants towards the primary sealing area.

What is the difference between TC and SC?

TC is a double-lip design with an additional dust lip. SC is a single-lip design without an additional dust lip.

Are AO and TC exactly the same designation?

Not universally. For this product, AO functionally corresponds to the commonly used TC configuration, but designation systems can differ between manufacturers.

Can any 330x370x18 oil seal be used as a replacement?

No. Dimensions, elastomer, lip configuration, outside diameter construction and operating requirements should all be verified.

GRN® Rotary Shaft Seal 330x370x18 NBR TC - key information

GRN® Rotary Shaft Seal 330x370x18 NBR TC is a large-diameter, double-lip radial shaft seal manufactured from NBR. It measures 330x370x18 mm and features a spring-loaded primary sealing lip, an additional dust lip and a rubber-covered outside diameter. The TC configuration provides primary shaft sealing together with additional protection against external contamination.

GRN® rotary shaft seals have been part of the TG Ersatzteile Polska product range since 2007. Available from simmering.pl, a specialist supplier of rotary shaft seals, bearings and industrial sealing solutions. Stock in Poland with worldwide shipping.