Rotary Shaft Seal 350x380x16 NBR B1 - Single Lip Metal Cased Oil Seal

Rotary Shaft Seal 350x380x16 NBR B1 - Single Lip Metal Cased Oil Seal

Rotary Shaft Seal 350x380x16 NBR B1 is a large-diameter radial shaft seal with dimensions 350x380x16 mm. It features an NBR (Nitrile Butadiene Rubber) sealing lip, a spring-loaded primary lip and a metal outside diameter. The B1 design is single-lip, meaning that this seal does not have an additional secondary dust lip.

Technical data

350x380x16 mm dimensions

The designation 350x380x16 mm defines:

350 mm - nominal shaft diameter
380 mm - nominal housing bore diameter
16 mm - seal width

Because this is a large-diameter rotary shaft seal, replacement selection should take into account not only the dimensions but also the B1 construction, NBR sealing material and metal outside diameter.

What does B1 mean?

For this rotary shaft seal, B1 identifies a construction with:

• one primary sealing lip
• a garter spring acting on the primary lip
• metal outside diameter
• no additional dust lip

The exposed metal outside diameter is an important feature of the B1 construction and distinguishes it from common rubber-covered rotary shaft seals.

Single-lip design

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 B1 design does not have an additional dust lip. This is an important distinction when comparing it with double-lip rotary shaft seals.

Metal cased construction

A characteristic feature of this B1 oil seal is its metal outside diameter.

The metal casing provides the external surface that fits into the housing bore. This differs from rotary shaft seals where the outer metal reinforcement is completely covered with elastomer.

For this reason, a 350x380x16 B1 seal should not automatically be replaced by a rubber-covered seal simply because the nominal dimensions are identical.

Housing design, fit and installation requirements should also be considered.

NBR - Nitrile Butadiene Rubber

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

It is commonly used in applications involving mineral oils and greases. Actual suitability depends on the specific medium, operating temperature, shaft surface speed and other operating conditions.

Material compatibility should therefore always be checked for the specific application.

B1 vs rubber-covered oil seal

The primary difference is the construction of the outside diameter.

B1 - metal outside diameter, one spring-loaded primary sealing lip and no additional dust lip.

A typical rubber-covered single-lip seal has its external metal reinforcement covered with elastomer.

Even if both seals have dimensions of 350x380x16 mm, this does not automatically make them fully interchangeable.

B1 vs double-lip oil seal

The B1 design in this product is single-lip.

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

A double-lip seal includes an additional lip on the external side of the primary sealing area. When this additional protection is required, the correct double-lip design should be selected according to the specific manufacturer's nomenclature.

Function of the 350x380x16 B1 seal

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

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

With dimensions of 350x380x16 mm, this is a large-diameter 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 350x380x16 NBR B1
• Oil Seal 350x380x16 NBR B1
• B1 Oil Seal 350x380x16
• NBR Oil Seal 350x380x16 B1
• Metal Cased Oil Seal 350x380x16
• Single Lip Oil Seal 350x380x16 NBR
• Shaft Seal 350x380x16 B1
• 350x380x16 NBR B1

The B1 designation should be retained in the English product description because structural designation systems may differ between manufacturers.

Selecting a 350x380x16 NBR B1 seal

Before ordering, verify:

• shaft diameter 350 mm
• housing bore diameter 380 mm
• width 16 mm
• NBR sealing lip material
• B1 construction
• single primary sealing lip
• no additional dust lip
• metal outside diameter
• sealed medium
• operating temperature
• shaft surface speed
• shaft sealing surface condition
• housing bore requirements

Matching the 350x380x16 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 sealing lip should be free from sharp edges, burrs and damage that could cut or prematurely wear the elastomer.

Because the B1 design has a metal outside diameter, the condition and dimensions of the housing bore are particularly important.

The seal should be pressed evenly into the housing around its entire circumference without tilting or deforming the metal case.

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

FAQ - Rotary Shaft Seal 350x380x16 NBR B1

What are the dimensions of this B1 oil seal?

The dimensions are 350x380x16 mm: 350 mm shaft diameter, 380 mm outside diameter and 16 mm width.

Is this B1 seal a single-lip design?

Yes. This B1 seal has one spring-loaded primary sealing lip and no additional dust lip.

Does the B1 seal have a metal outside diameter?

Yes. The 350x380x16 B1 has a metal outside diameter that fits into the housing bore.

What material is the sealing lip made from?

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

Does the B1 design have a dust lip?

No. This B1 design has a single primary sealing lip and does not incorporate an additional secondary dust lip.

Is B1 the same as TC?

No. For this product, B1 is a single-lip design with a metal outside diameter. TC is commonly used for a double-lip design with a rubber-covered outside diameter.

Can a rubber-covered seal replace this B1 seal?

It should not automatically be considered interchangeable. The housing design, required fit, outside diameter construction and operating conditions should be checked.

Can any 350x380x16 oil seal be used as a replacement?

No. In addition to the dimensions, the sealing material, lip configuration and outside diameter construction must be verified.

Rotary Shaft Seal 350x380x16 NBR B1 - key information

Rotary Shaft Seal 350x380x16 NBR B1 is a large-diameter, single-lip radial shaft seal with a metal outside diameter. It features an NBR sealing lip, a garter spring and dimensions of 350x380x16 mm. The B1 construction has one primary sealing lip and no additional secondary dust lip.

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