Rotary Shaft Seal 600x640x20 NBR TC Oil Seal Double Lip

Rotary Shaft Seal 600x640x20 NBR TC - Double Lip Oil Seal

Rotary Shaft Seal 600x640x20 NBR TC is a large-diameter radial shaft seal manufactured from NBR (Nitrile Butadiene Rubber). It has dimensions of 600x640x20 mm and a double-lip design consisting of a spring-loaded primary sealing lip and an additional dust lip. The TC design features a rubber-covered outside diameter.

Technical data

Dimensions of the 600x640x20 oil seal

The designation 600x640x20 mm defines:

600 mm - shaft diameter
640 mm - housing bore diameter
20 mm - seal width

This is a very large-diameter rotary shaft seal. When selecting a replacement, all three dimensions and the sealing-lip configuration should be verified.

What does TC mean?

TC is a commonly used designation for a double-lip rotary shaft seal with a rubber-covered outside diameter.

This design incorporates:

• a primary sealing lip
• a garter spring acting on the primary lip
• an additional dust lip
• a rubber-covered outside diameter

The primary lip provides the main sealing function, while the secondary lip provides an additional barrier against external contamination.

Double-lip design

The 600x640x20 NBR TC has a spring-loaded primary sealing lip that operates directly against the rotating shaft surface.

The garter spring helps maintain contact between the sealing edge and shaft. The additional secondary lip is positioned on the external side and helps reduce the ingress of dust and other contaminants towards the primary sealing lip.

This distinguishes the TC double-lip design from a conventional SC single-lip design.

NBR - Nitrile Butadiene Rubber

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

It is commonly used in sealing applications involving mineral oils and greases.

Actual material compatibility should always be checked against the specific medium, operating temperature and application conditions. Selection should not be based solely on the fact that the seal is manufactured from NBR.

TC vs SC rotary shaft seal

The principal difference is the sealing-lip configuration.

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.

Both versions may be available in identical nominal dimensions, but this does not automatically make them technically interchangeable.

Alternative designations and search references

This product may also be encountered under several natural descriptions:

• Rotary Shaft Seal 600x640x20 NBR TC
• Oil Seal 600x640x20 TC
• NBR Oil Seal 600x640x20
• Shaft Seal 600x640x20 NBR
• Double Lip Oil Seal 600x640x20
• 600x640x20 TC
• 600x640x20 NBR

When selecting a replacement, the actual seal construction should always be verified rather than relying solely on terminology used by an individual supplier.

Function of the 600x640x20 rotary shaft seal

A rotary shaft seal is used at the point where a rotating shaft passes through a housing.

Its primary function is to help retain lubricant or another compatible medium within the operating area. The additional dust lip provides an extra barrier against contaminants approaching the primary sealing lip from the external environment.

Because 600x640x20 mm is a very large seal size, the specific application should be identified from machine documentation or from the dimensions and construction of the original seal.

Selecting a 600x640x20 NBR TC seal

Before ordering, verify:

• shaft diameter 600 mm
• housing bore diameter 640 mm
• width 20 mm
• TC double-lip design
• NBR material
• mounting orientation
• shaft sealing surface condition
• sealed medium
• operating temperature
• shaft surface speed
• requirements of the specific application

Matching the 600x640x20 mm dimensions alone does not guarantee full interchangeability between two rotary shaft seals.

Installation

Before installation, thoroughly clean the shaft and seal housing. The shaft surface in contact with the primary sealing lip should be free from sharp edges and damage that could cut or prematurely wear the elastomer.

The seal should be pressed into the housing evenly to avoid deformation. The primary sealing lip should normally face the medium that is to be retained.

Care should be taken to avoid damaging the sealing lips during installation over shaft edges, splines or keyways.

FAQ - Rotary Shaft Seal 600x640x20 NBR TC

What are the dimensions of this rotary shaft seal?

The seal measures 600x640x20 mm: 600 mm shaft diameter, 640 mm housing bore diameter and 20 mm width.

What material is the seal made from?

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

Is the 600x640x20 TC a double-lip oil seal?

Yes. The TC design has a spring-loaded primary sealing lip and an additional dust lip.

What does TC mean on an oil seal?

TC is commonly used to identify a double-lip rotary shaft seal with a rubber-covered outside diameter, a spring-loaded primary lip and an additional dust lip.

What is the purpose of the second lip?

The additional lip helps reduce the ingress of dust and other external contaminants towards the primary sealing lip.

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.

Is every 600x640x20 oil seal interchangeable?

No. In addition to dimensions, the material, lip configuration, outside diameter design and operating requirements must be checked.

Rotary Shaft Seal 600x640x20 NBR TC - key information

Rotary Shaft Seal 600x640x20 NBR TC is a double-lip radial shaft seal with a spring-loaded primary sealing lip and an additional dust lip. It has a 600 mm shaft diameter, 640 mm outside diameter and 20 mm width. The sealing element is manufactured from NBR (Nitrile Butadiene Rubber).

Available from simmering.pl, a specialist supplier of rotary shaft seals, bearings and industrial sealing solutions. Stock in Poland with worldwide shipping.