Rotary Shaft Seal 380x420x20 NBR TC Oil Seal Double Lip GRN®

Rotary Shaft Seal 380x420x20 NBR TC GRN® - Double Lip Oil Seal

GRN® Rotary Shaft Seal 380x420x20 NBR TC is a large-diameter, double-lip radial shaft seal with dimensions 380x420x20 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 design provides the primary sealing function together with an additional barrier against external contamination.

Technical data

380x420x20 mm dimensions

The designation 380x420x20 mm defines:

380 mm - nominal shaft diameter
420 mm - nominal housing bore diameter
20 mm - seal width

As this is a large-diameter rotary shaft seal, all three dimensions should be carefully verified together with the elastomer material and sealing-lip configuration when selecting a replacement.

What does NBR TC mean?

The designation identifies both the material and construction of the seal.

NBR means Nitrile Butadiene Rubber, an elastomer widely used for rotary shaft seals.

TC identifies a double-lip construction incorporating a spring-loaded primary sealing lip and an additional dust lip. The design also features a rubber-covered outside diameter.

TC double-lip design

The GRN® 380x420x20 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.

The outside diameter is rubber-covered.

NBR - Nitrile Butadiene Rubber

NBR is one of the most widely used elastomers in rotary shaft sealing technology.

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

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

TC vs SC rotary shaft seal

The main difference between TC and SC designs is the presence of an additional dust lip.

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

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

Seals with identical nominal dimensions but different lip configurations should not automatically be considered interchangeable.

Function of the 380x420x20 rotary shaft seal

A rotary shaft seal is installed 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 380x420x20 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 380x420x20 NBR TC
• Rotary Shaft Seal 380x420x20 NBR TC GRN
• GRN Oil Seal 380x420x20 NBR TC
• Oil Seal 380x420x20 NBR TC
• NBR Oil Seal 380x420x20 TC
• Double Lip Oil Seal 380x420x20
• 380x420x20 NBR TC
• Shaft Seal 380x420x20 NBR

The recommended English product name is:

Rotary Shaft Seal 380x420x20 NBR TC GRN® - Double Lip Oil Seal

Selecting a GRN® 380x420x20 NBR TC seal

Before ordering, verify:

• shaft diameter 380 mm
• housing bore diameter 420 mm
• width 20 mm
• NBR elastomer
• TC double-lip construction
• presence of the additional dust lip
• sealed medium
• operating temperature
• shaft surface speed
• condition of the shaft sealing surface
• requirements of the specific sealing arrangement

Matching the 380x420x20 mm dimensions alone does not guarantee full interchangeability with every other rotary shaft seal of the same size.

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 that could cut or prematurely wear the elastomer.

The seal should be pressed evenly into the housing around its entire circumference without tilting or deformation. With a 380 mm shaft diameter, uniform installation is particularly important.

The spring-loaded primary sealing lip should normally face the medium to be retained. When passing the seal over sharp edges, grooves or other potentially damaging surfaces, the sealing lip should be protected.

FAQ - GRN® Rotary Shaft Seal 380x420x20 NBR TC

What are the dimensions of this GRN® oil seal?

The seal measures 380x420x20 mm: 380 mm shaft diameter, 420 mm outside diameter and 20 mm width.

Is the 380x420x20 TC a double-lip oil seal?

Yes. The TC design incorporates 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 rotary shaft seal 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?

The secondary lip 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 the additional dust lip.

Can any 380x420x20 oil seal be used as a replacement?

No. In addition to dimensions, the elastomer, lip configuration, outside diameter construction and operating requirements should be verified.

GRN® Rotary Shaft Seal 380x420x20 NBR TC - key information

GRN® Rotary Shaft Seal 380x420x20 NBR TC is a large-diameter, double-lip radial shaft seal manufactured from NBR. It has a spring-loaded primary sealing lip, an additional dust lip and a rubber-covered outside diameter. Its dimensions are 380x420x20 mm: 380 mm shaft diameter, 420 mm outside diameter and 20 mm width.

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.