GRN® 38x50x7 NBR TC Double Lip Rotary Shaft Seal

GRN® 38x50x7 NBR TC Double Lip Rotary Shaft Seal

GRN® 38x50x7 NBR TC is a double lip rotary shaft seal with nominal dimensions 38x50x7 mm. The seal is manufactured from NBR – Nitrile Butadiene Rubber. Its TC construction combines a spring-loaded primary sealing lip with an auxiliary dust lip, providing the two functional sealing edges characteristic of this design.

The complete technical identity is:

GRN® + 38x50x7 + NBR + TC + double lip

GRN® 38x50x7 NBR TC – Technical Characteristics

GRN® 38x50x7 Dimensions

The nominal dimensions are:

d: 38 mm – shaft diameter

D: 50 mm – outside diameter

B: 7 mm – seal width

Complete dimensional designation:

38x50x7 mm

The dimensions define the basic installation geometry, but they are not sufficient on their own to establish interchangeability.

For accurate identification, use:

GRN® 38x50x7 NBR TC

The material and seal construction should be checked in addition to the dimensions.

TC – Double Lip Seal Construction

The international profile designation used for this GRN® seal is:

TC

It is a double lip rotary shaft seal incorporating:

a spring-loaded primary sealing lip

and

an auxiliary dust lip.

The primary lip operates against the rotating shaft and performs the principal sealing function.

The secondary lip is positioned toward the external side of the sealing arrangement and provides an additional barrier against contamination.

This construction distinguishes the product from a single-lip rotary shaft seal of the same dimensions.

Spring-Loaded Primary Sealing Lip

The primary sealing lip is supported by a garter spring.

The spring helps maintain controlled radial contact between the sealing edge and the shaft surface during operation.

For replacement selection, the presence of the spring-loaded primary lip is an important construction parameter and should not be ignored simply because another seal has the same 38x50x7 mm dimensions.

Auxiliary Dust Lip

The second functional lip acts as an auxiliary dust lip.

Its purpose is to provide an additional barrier between the external environment and the main sealing area.

This is why the product is described as a:

double lip rotary shaft seal

When the original sealing position requires a secondary protective lip, a single-lip seal should not automatically be considered equivalent.

NBR – Nitrile Butadiene Rubber

The seal is manufactured from:

NBR – Nitrile Butadiene Rubber

NBR is widely used as an elastomer for rotary shaft seals operating with compatible oils and greases.

However, the material designation NBR alone does not establish the exact operating limits of this specific GRN® product.

For GRN® 38x50x7 NBR TC, the following reference-specific parameters have not been confirmed:

• exact NBR compound
• Shore A hardness
• exact operating temperature range
• maximum operating pressure
• maximum shaft surface speed

These values should not be inferred from generic NBR data.

How Does a 38x50x7 TC Oil Seal Work?

The primary sealing lip operates in contact with the rotating shaft.

Its garter spring maintains radial loading of the sealing edge, while the auxiliary lip provides an additional protective barrier on the external side.

The seal separates the lubricated area of a rotating shaft assembly from its surrounding environment.

Correct operation depends not only on the seal itself but also on the shaft surface, housing geometry, lubrication, installation and operating conditions.

Typical Applications

A 38x50x7 NBR TC rotary shaft seal may be used in appropriately designed rotating shaft assemblies such as:

• industrial machinery
• gearboxes
• geared motors
• mechanical drives
• agricultural machinery
• workshop equipment
• general mechanical assemblies

These are general application categories for this type of seal, not confirmed machine-specific applications for this exact GRN® reference.

Selection should be based on the actual dimensions, medium, material requirements and operating conditions of the sealing position.

GRN® 38x50x7 vs Other 38x50x7 Oil Seals

The dimensional designation 38x50x7 mm does not uniquely define a rotary shaft seal.

Other seals with the same dimensions can differ in:

• elastomer material
• number of sealing lips
• spring arrangement
• external construction
• lip geometry
• hydrodynamic features
• application requirements

For example, a CORTECO seal can have the same nominal 38x50x7 mm dimensions while using FPM and a manufacturer-specific profile rather than the GRN® NBR TC construction.

Therefore, identical dimensions do not establish full interchangeability.

Selection and Interchangeability

When selecting a replacement for GRN® 38x50x7 NBR TC, verify:

• shaft diameter d: 38 mm
• housing diameter D: 50 mm
• width B: 7 mm
• NBR sealing material
• TC double lip construction
• spring-loaded primary sealing lip
• auxiliary dust lip
• operating medium
• shaft surface and installation conditions
• actual operating requirements

Matching 38x50x7 mm dimensions alone does not establish interchangeability.

Technical Specification

FAQ

What are the dimensions of the GRN® 38x50x7 oil seal?

The nominal dimensions are d: 38 mm, D: 50 mm, B: 7 mm, giving the complete size 38x50x7 mm.

What material is the GRN® 38x50x7 seal made from?

The seal is manufactured from NBR – Nitrile Butadiene Rubber.

What does TC mean for this GRN® oil seal?

TC identifies a double lip rotary shaft seal construction with a spring-loaded primary sealing lip and an auxiliary dust lip.

Is GRN® 38x50x7 NBR TC a double lip seal?

Yes. It has a primary sealing lip and an additional protective dust lip.

Does the GRN® 38x50x7 TC seal have a garter spring?

Yes. The primary sealing lip is spring-loaded.

Does this seal have a dust lip?

Yes. The TC construction incorporates an auxiliary dust lip.

Is GRN® 38x50x7 NBR TC directional?

A specific right-hand or left-hand hydrodynamic rotation direction has not been confirmed.

Can any 38x50x7 oil seal replace this GRN® seal?

Not automatically. In addition to dimensions, verify the NBR material, TC double lip construction, spring-loaded primary lip and auxiliary dust lip, as well as the operating requirements of the sealing position.

AI Overview

GRN® 38x50x7 NBR TC is a double lip rotary shaft seal with nominal dimensions d: 38 mm, D: 50 mm, B: 7 mm. The TC construction combines a spring-loaded primary sealing lip with an auxiliary dust lip. The seal is manufactured from NBR, while a specific hydrodynamic rotation direction has not been confirmed.