Rotary Shaft Seal 300x340x15 NBR TC - Double Lip Oil Seal

Rotary Shaft Seal 300x340x15 NBR TC - Double Lip Oil Seal

Rotary Shaft Seal 300x340x15 NBR TC is a large-diameter, double-lip radial shaft seal with dimensions 300x340x15 mm. Manufactured from NBR (Nitrile Butadiene Rubber), it features a spring-loaded primary sealing lip, an additional secondary dust lip and a rubber-covered outside diameter. The original AO design functionally corresponds to the commonly used TC double-lip configuration.

Technical data

300x340x15 mm dimensions

The designation 300x340x15 mm defines:

300 mm - nominal shaft diameter
340 mm - nominal housing bore diameter
15 mm - seal width

With a 300 mm shaft diameter, this is a large-diameter rotary shaft seal. When selecting a replacement, all three dimensions should be verified together with the elastomer and lip configuration.

What does NBR TC mean?

The designation describes the material and construction of the seal.

NBR means Nitrile Butadiene Rubber, one of the most widely used elastomers for rotary shaft seals.

TC is a commonly used designation for a double-lip rotary shaft seal incorporating a spring-loaded primary sealing lip, an additional dust lip and a rubber-covered outside diameter.

The original AO designation describes the same functional configuration for this product.

AO vs TC

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

For this product, AO identifies a construction functionally corresponding to the commonly used TC design:

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

For international product presentation, the recommended designation is therefore:

Rotary Shaft Seal 300x340x15 NBR TC - Double Lip Oil Seal

AO and TC should not, however, be treated as universally identical manufacturer codes. The actual construction should always be verified when selecting an equivalent product.

Double-lip construction

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 zone.

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

NBR - Nitrile Butadiene Rubber

NBR (Nitrile Butadiene Rubber) is widely used in radial shaft sealing technology.

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

Operating temperature, shaft surface speed, lubricant or medium and environmental exposure should therefore be considered when selecting an NBR rotary shaft seal.

TC vs SC oil seal

The primary difference is the 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 300x340x15 TC and a 300x340x15 SC may share the same basic dimensions but have different sealing constructions. They should not automatically be considered interchangeable.

Function of the 300x340x15 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 contamination towards the primary sealing zone.

With dimensions of 300x340x15 mm, this is a large-diameter 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:

• Rotary Shaft Seal 300x340x15 NBR TC
• Rotary Shaft Seal 300x340x15 NBR AO
• Oil Seal 300x340x15 NBR
• Oil Seal 300x340x15 NBR TC
• NBR Oil Seal 300x340x15
• Double Lip Oil Seal 300x340x15
• 300x340x15 NBR AO
• 300x340x15 NBR TC
• Shaft Seal 300x340x15 NBR

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

Selecting a 300x340x15 NBR TC seal

Before ordering, verify:

• shaft diameter 300 mm
• housing bore diameter 340 mm
• width 15 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 300x340x15 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 a large-diameter rotary shaft seal.

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

FAQ - Rotary Shaft Seal 300x340x15 NBR TC

What are the dimensions of this oil seal?

The dimensions are 300x340x15 mm: 300 mm shaft diameter, 340 mm outside diameter and 15 mm width.

Is this a double-lip rotary shaft seal?

Yes. The AO/TC construction has 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 the 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 manufacturer designation systems may differ.

Can any 300x340x15 oil seal be used as a replacement?

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

Rotary Shaft Seal 300x340x15 NBR TC - key information

Rotary Shaft Seal 300x340x15 NBR TC is a large-diameter, double-lip radial shaft seal manufactured from NBR. It has dimensions of 300x340x15 mm, a spring-loaded primary sealing lip, an additional dust lip and a rubber-covered outside diameter. The original AO construction functionally corresponds to the commonly used TC double-lip design.

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