Rotary Shaft Seal 335x375x18 NBR 70 Shore A SC - Single Lip Oil Seal

Rotary Shaft Seal 335x375x18 NBR 70 Shore A SC is a large-diameter, single-lip radial shaft seal with dimensions 335x375x18 mm. The sealing element is manufactured from NBR (Nitrile Butadiene Rubber) with a nominal hardness of 70 Shore A. The single-lip design features a spring-loaded primary sealing lip and does not incorporate an additional secondary dust lip.

Technical data

335x375x18 mm dimensions

The designation 335x375x18 mm defines:

335 mm - nominal shaft diameter
375 mm - nominal housing bore diameter
18 mm - seal width

Due to the large diameter of this rotary shaft seal, replacement selection should include verification of all three dimensions, the NBR material, 70 Shore A hardness and the single-lip construction.

What does the single-lip design mean?

This rotary shaft seal incorporates:

• one primary sealing lip
• a garter spring acting on the primary lip
• a rubber-covered outside diameter
• no additional secondary dust lip

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

Unlike a double-lip TC design, this seal does not incorporate an additional dust lip.

NBR 70 Shore A

The sealing element is manufactured from NBR (Nitrile Butadiene Rubber) with a nominal hardness of 70 Shore A.

NBR is one of the most commonly used elastomers for rotary shaft sealing applications and is widely used in applications involving mineral oils and greases.

Actual suitability depends on the specific medium and operating conditions, including temperature, shaft surface speed and environmental exposure.

What does 70 Shore A mean?

70 Shore A, also written as 70 ShA, specifies the nominal hardness of the elastomer according to the Shore A hardness scale.

It should not be confused with the seal design designation.

For this product:

A - original seal design designation
NBR - elastomer material
70 Shore A - nominal elastomer hardness

Single lip SC vs double lip TC

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

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

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

A 335x375x18 SC seal and a 335x375x18 TC seal may have identical basic dimensions but different constructions. They should therefore not automatically be considered interchangeable.

Function of the 335x375x18 rotary shaft seal

A rotary shaft seal is installed between a rotating shaft and a stationary housing.

The spring-loaded primary sealing lip operates against the shaft surface and helps retain a compatible lubricant or other medium within the operating area.

With dimensions of 335x375x18 mm, this is a large-diameter rotary shaft seal. The exact application should be confirmed from machine documentation or from 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 335x375x18 NBR 70 Shore A
• Rotary Shaft Seal 335x375x18 NBR SC
• Oil Seal 335x375x18 NBR
• Oil Seal 335x375x18 NBR 70 Shore A
• Single Lip Oil Seal 335x375x18
• 335x375x18 NBR 70 ShA
• 335x375x18 NBR SC
• Shaft Seal 335x375x18 NBR

The recommended international product name is:

Rotary Shaft Seal 335x375x18 NBR 70 Shore A SC - Single Lip Oil Seal

Design designation systems can vary between manufacturers, so the actual seal construction should always be verified when selecting an equivalent.

Selecting a 335x375x18 NBR seal

Before ordering, verify:

• shaft diameter 335 mm
• housing bore diameter 375 mm
• width 18 mm
• NBR elastomer
• nominal hardness 70 Shore A
• single-lip construction
• spring-loaded primary sealing lip
• absence of an additional dust lip
• outside diameter construction
• sealed medium
• operating temperature
• shaft surface speed
• shaft sealing surface condition
• requirements of the specific application

Matching the 335x375x18 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 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. Uniform installation is particularly important with a large-diameter seal.

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

FAQ - Rotary Shaft Seal 335x375x18 NBR 70 Shore A

What are the dimensions of this oil seal?

The seal measures 335x375x18 mm: 335 mm shaft diameter, 375 mm outside diameter and 18 mm width.

Is this a single-lip rotary shaft seal?

Yes. It has one spring-loaded primary sealing lip and no additional secondary dust lip.

What material is the seal made from?

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

What does 70 Shore A mean?

70 Shore A specifies the nominal hardness of the NBR elastomer according to the Shore A hardness scale.

Does this seal have an additional dust lip?

No. This is a single-lip design without an additional secondary dust lip.

What is the difference between SC and TC?

SC is commonly used for a single-lip design, while TC identifies a double-lip design with an additional dust lip.

Can a TC seal replace this single-lip seal?

It should not automatically be considered interchangeable. The seal construction, housing arrangement and operating requirements should be checked.

Can any 335x375x18 oil seal be used as a replacement?

No. In addition to dimensions, the elastomer, hardness, lip configuration, outside diameter design and operating conditions must be verified.

Rotary Shaft Seal 335x375x18 NBR 70 Shore A - key information

Rotary Shaft Seal 335x375x18 NBR 70 Shore A is a large-diameter, single-lip radial shaft seal. It has a 335 mm shaft diameter, 375 mm outside diameter and 18 mm width. The NBR sealing element has a nominal hardness of 70 Shore A and incorporates a spring-loaded primary sealing lip without an additional dust lip.

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