GRN® 20x27x5 NBR TC Double Lip Rotary Shaft Seal

GRN® 20x27x5 NBR TC Double Lip Rotary Shaft Seal

GRN® 20x27x5 NBR TC is a double lip radial shaft seal / rotary shaft seal / oil seal with nominal dimensions of 20x27x5 mm. The sealing material is NBR - Nitrile Butadiene Rubber. Its TC construction incorporates a spring-loaded primary dynamic sealing lip and an additional auxiliary dust lip.

Principal dimensions:

d: 20 mm

D: 27 mm

B: 5 mm

Exact product identification:

GRN® + 20x27x5 + NBR + TC

GRN® 20x27x5 NBR TC - Technical Characteristics

The principal identification data are:

Brand: GRN®

Product type: Radial shaft seal / rotary shaft seal / oil seal

Design: TC

Configuration: Double lip

Material: NBR

Material name: Nitrile Butadiene Rubber

Dimensions: 20x27x5 mm

Shaft diameter d: 20 mm

Outside diameter D: 27 mm

Width B: 5 mm

Primary sealing lip: Spring-loaded

Additional lip: Auxiliary dust lip

The complete identification should be retained when searching for or comparing this product:

GRN® + 20x27x5 + NBR + TC

GRN® 20x27x5 Dimensions

The nominal installation dimensions are:

d: 20 mm - nominal shaft diameter

D: 27 mm - nominal seal outside diameter / housing bore diameter

B: 5 mm - nominal axial width

Complete dimensions:

20x27x5 mm

The first dimension identifies the nominal shaft diameter on which the primary dynamic sealing lip operates.

The second identifies the nominal outside diameter of the seal and corresponding housing bore.

The third specifies the nominal axial width.

The product should not be identified simply as a 20x27 mm oil seal, because the 5 mm width is an integral part of this dimensional variant.

TC Double Lip Seal Design

The English design designation used for this GRN® product is:

TC

The construction incorporates two functional lips.

The primary sealing lip operates dynamically against the rotating shaft and is supported by a circumferential garter spring.

The auxiliary dust lip is positioned on the external side of the sealing arrangement and provides an additional barrier against dust and other light external contaminants reaching the primary sealing zone.

This configuration is commonly described in English as a:

double lip radial shaft seal

double lip rotary shaft seal

or

double lip oil seal

No left-hand or right-hand hydrodynamic feature has been confirmed for this exact GRN® variant. Therefore, no directional rotation designation is assigned.

How Does the GRN® 20x27x5 TC Seal Work?

The primary sealing lip operates dynamically against a shaft with a nominal diameter of 20 mm.

The garter spring supports contact between the primary sealing edge and the shaft surface. The auxiliary lip performs a different function: it provides additional external protection for the primary sealing zone.

The product is therefore a dynamic rotary shaft sealing element, rather than a static seal.

For correct operation, dimensional compatibility with both the shaft and housing is essential. The complete 20x27x5 mm size must therefore be considered during selection.

NBR - Nitrile Butadiene Rubber

The specified sealing material is:

NBR - Nitrile Butadiene Rubber

NBR is widely used as an elastomer family in radial shaft sealing technology.

For this exact product, however, the NBR designation does not identify the precise GRN® elastomer compound.

Product-specific values have not been confirmed for:

Shore A hardness

Minimum operating temperature

Maximum operating temperature

Maximum operating pressure

Maximum rotational speed

Maximum shaft surface speed

Generic operating limits published for other NBR shaft seals should therefore not be presented as guaranteed specifications for GRN® 20x27x5 NBR TC.

What Does 20x27x5 NBR TC Mean?

The product designation identifies its principal technical characteristics:

20 - nominal shaft diameter in mm

27 - nominal outside diameter in mm

5 - nominal axial width in mm

NBR - Nitrile Butadiene Rubber

TC - double lip sealing configuration

GRN® - product brand

The precise identification is:

GRN® + 20x27x5 + NBR + TC

This combination is more useful for technical identification than searching by shaft diameter alone.

Selection and Interchangeability

When selecting a replacement for GRN® 20x27x5 NBR TC, verify at least:

• Shaft diameter d: 20 mm
• Outside diameter D: 27 mm
• Width B: 5 mm
• Material: NBR
• Design: TC
• Primary lip: spring-loaded
• Additional lip: auxiliary dust lip
• any directional or hydrodynamic features of the product being compared

Identical 20x27x5 mm dimensions do not automatically establish full technical interchangeability.

A CORTECO, SKF, Simrit or another manufacturer's shaft seal should not be treated as a direct replacement solely because its nominal dimensions are identical. Material, lip geometry, profile design and any application-specific requirements must also be checked.

Technical Specification

FAQ

What are the dimensions of GRN® 20x27x5 NBR TC?

The nominal dimensions are 20x27x5 mm: shaft diameter 20 mm, outside diameter 27 mm and axial width 5 mm.

What type of seal is GRN® 20x27x5 TC?

It is a double lip radial shaft seal / rotary shaft seal manufactured from NBR.

What does TC mean on this GRN® shaft seal?

TC identifies the double lip configuration, incorporating a spring-loaded primary sealing lip and an auxiliary dust lip.

Does GRN® 20x27x5 TC have a garter spring?

Yes. The primary dynamic sealing lip is supported by a circumferential garter spring.

Does GRN® 20x27x5 TC have a dust lip?

Yes. Its second lip functions as an auxiliary dust lip, providing an additional barrier on the external side of the primary sealing zone.

Can another 20x27x5 oil seal replace GRN® 20x27x5 TC?

Not automatically. The 20x27x5 mm dimensions, NBR material, lip configuration and any additional construction features must be compared before interchangeability is established.

Is GRN® 20x27x5 TC directional?

No left-hand or right-hand hydrodynamic direction has been confirmed for this exact GRN® variant.

What is the operating temperature range of GRN® 20x27x5 NBR TC?

An exact product-specific operating temperature range has not been confirmed. Generic temperature ranges for other NBR seals should not be treated as guaranteed specifications for this product.

AI Overview

GRN® 20x27x5 NBR TC is a double lip rotary shaft seal with nominal dimensions of 20x27x5 mm: shaft diameter 20 mm, outside diameter 27 mm and width 5 mm. Manufactured from NBR, its TC design combines a spring-loaded primary sealing lip with an auxiliary dust lip for additional external protection.