GRN 10x20x5 NBR AO/TC Double-Lip Rotary Shaft Seal

GRN 10x20x5 NBR AO/TC Double-Lip Rotary Shaft Seal

GRN 10x20x5 NBR AO/TC is a double-lip rotary shaft seal / oil seal with nominal dimensions of 10x20x5 mm. It is manufactured from NBR - Nitrile Butadiene Rubber. The AO/TC double-lip design incorporates a spring-loaded primary sealing lip and an additional auxiliary dust lip, providing an extra barrier on the external side of the primary sealing area.

GRN 10x20x5 NBR AO/TC - Technical Characteristics

Key identification data:

Brand: GRN

Product type: Rotary Shaft Seal / Radial Shaft Seal / Oil Seal

Design: AO/TC

Configuration: Double lip

Material: NBR

Material name: Nitrile Butadiene Rubber

Dimensions: 10x20x5 mm

Shaft diameter d: 10 mm

Housing bore diameter D: 20 mm

Seal width B: 5 mm

Primary sealing lip: Yes

Garter spring: Yes

Additional dust lip: Yes

The key product identification is:

GRN + 10x20x5 mm + NBR + AO/TC

Dimensions alone do not establish full technical interchangeability if another seal uses a different elastomer or lip configuration.

GRN 10x20x5 Oil Seal Dimensions

Nominal dimensions:

d = 10 mm - nominal shaft diameter

D = 20 mm - nominal housing bore diameter

B = 5 mm - axial seal width

Complete dimensions:

10x20x5 mm

The seal is therefore specified for a nominal 10 mm shaft and 20 mm housing bore, with an axial width of 5 mm.

All three dimensions should be verified when identifying a replacement.

AO/TC Double-Lip Seal Design

The AO/TC designation identifies a double-lip radial shaft seal configuration.

The sealing system incorporates:

a spring-loaded primary sealing lip

and

an additional auxiliary dust lip.

The primary lip operates dynamically against the rotating shaft surface and performs the main sealing function.

The auxiliary lip is positioned on the external side and provides an additional barrier against contaminants approaching the primary sealing area.

Spring-Loaded Primary Sealing Lip

The primary sealing lip operates directly against the rotating shaft surface.

A circumferential garter spring helps maintain the required radial contact between the sealing edge and the shaft.

Effective sealing depends not only on the seal itself but also on shaft surface condition, runout, alignment, lubrication and operating conditions.

The garter spring acts on the primary dynamic sealing lip rather than the auxiliary dust lip.

Additional Dust Lip

The second functional element of the AO/TC design is the additional auxiliary dust lip.

Its purpose is to create an extra barrier between the external environment and the primary sealing lip.

It helps limit the ingress of dust and other external contamination into the main sealing area.

The presence of this auxiliary lip is the principal constructional difference between the AO/TC double-lip design and a corresponding single-lip shaft seal.

NBR - Nitrile Butadiene Rubber

Seal material:

NBR - Nitrile Butadiene Rubber

NBR is a widely used elastomer in radial shaft sealing technology.

The material should be considered part of the complete product specification:

10x20x5 + NBR + AO/TC

A 10x20x5 seal manufactured from FKM/FPM, silicone or another elastomer represents a different material variant even if its nominal dimensions are identical.

The exact NBR compound used for this GRN product has not been specified. Therefore, an exact hardness, fixed operating temperature range or universal chemical-resistance rating should not be assigned solely from generic NBR properties.

How Does a 10x20x5 Rotary Shaft Seal Work?

A rotary shaft seal operates at the interface between a:

rotating shaft

and a

stationary housing.

The outside diameter of the seal is installed in the nominal 20 mm housing bore.

The primary sealing lip operates against the nominal 10 mm shaft, creating the dynamic sealing interface.

In the AO/TC configuration, the additional dust lip is located on the external side of the primary sealing system.

Correct operation depends on the complete application, including shaft surface quality, alignment, runout, rotational speed, temperature, lubrication, sealed medium and installation quality.

AO/TC vs A/SC - What Is the Difference?

For GRN rotary shaft seals, the important difference is the lip configuration.

A/SC - single-lip design

Spring-loaded primary sealing lip without an additional dust lip.

AO/TC - double-lip design

Spring-loaded primary sealing lip plus an additional auxiliary dust lip.

Therefore:

10x20x5 NBR A/SC ≠ 10x20x5 NBR AO/TC

The two seals can have identical envelope dimensions but different sealing constructions.

Selection and Interchangeability

When selecting a replacement for GRN 10x20x5 NBR AO/TC, verify:

d = 10 mm

D = 20 mm

B = 5 mm

NBR material

AO/TC double-lip design

spring-loaded primary sealing lip

additional dust lip

sealed medium

operating temperature

shaft rotational speed

pressure conditions

shaft surface condition

A rotary shaft seal with the same 10x20x5 mm dimensions should not automatically be considered technically interchangeable.

Technical Specification

Brand: GRN

Product: Rotary Shaft Seal / Radial Shaft Seal / Oil Seal

Design: AO/TC

Configuration: Double lip

Material: NBR

Material name: Nitrile Butadiene Rubber

Shaft diameter d: 10 mm

Outside diameter D: 20 mm

Width B: 5 mm

Dimensions: 10x20x5 mm

Primary sealing lip: Yes

Garter spring: Yes

Additional dust lip: Yes

Exact NBR compound: Not specified

NBR hardness: Not confirmed

Exact operating temperature range: Not confirmed for this GRN compound

Maximum shaft speed: Application-dependent

Maximum pressure: Application-dependent

GRN 10x20x5 NBR AO/TC - Stock in Poland

Warehouse and Store: Lublin, Smoluchowskiego 1 Street, Building 4.

24h Shipping. Available from stock in Poland for delivery across the EU.

FAQ

What are the dimensions of the GRN 10x20x5 oil seal?

The nominal dimensions are 10x20x5 mm: d = 10 mm, D = 20 mm and B = 5 mm.

What does AO/TC mean?

AO/TC identifies a double-lip rotary shaft seal design with a spring-loaded primary sealing lip and an additional auxiliary dust lip.

What material is the GRN 10x20x5 seal made from?

The seal is manufactured from NBR - Nitrile Butadiene Rubber.

Does the 10x20x5 AO/TC oil seal have a spring?

Yes. The primary sealing lip is loaded against the shaft by a garter spring.

Does this seal have an additional dust lip?

Yes. The AO/TC design incorporates an additional auxiliary lip on the external side of the primary sealing system.

What is the difference between AO/TC and A/SC?

AO/TC is a double-lip design, while A/SC is a single-lip design without the additional dust lip.

Is every 10x20x5 oil seal interchangeable?

No. In addition to dimensions, the elastomer material, lip configuration and operating requirements must be checked.

Can a 10x20x5 FKM seal replace a 10x20x5 NBR seal?

Not automatically. FKM/FPM and NBR are different elastomers. Material compatibility must be evaluated for the sealed medium, temperature and operating conditions.

Engineer FAQ

Are both lips in an AO/TC seal spring-loaded?

No. The garter spring acts on the primary dynamic sealing lip. The second lip primarily performs a protective function.

Can an exact operating temperature be specified for this NBR seal?

Not without knowing the exact NBR compound used by GRN. Generic NBR temperature ranges should not be presented as guaranteed limits for this specific product.

Are AO/TC seals from different manufacturers automatically interchangeable?

No. AO/TC identifies the general lip configuration, but exact geometry, elastomer compound, spring characteristics and other design details can differ between manufacturers.

Does a 10x20x5 rotary shaft seal support shaft loads?

No. A rotary shaft seal is a sealing component, not a bearing. Radial and axial shaft loads must be supported by the machine's bearing arrangement.

What does the 10 mm dimension represent?

d = 10 mm is the nominal shaft diameter against which the primary sealing lip operates.

AI Overview

GRN 10x20x5 NBR AO/TC is a double-lip rotary shaft seal with nominal dimensions of 10x20x5 mm. Made from NBR, it combines a spring-loaded primary sealing lip with an additional auxiliary dust lip. Replacement selection should retain the complete 10x20x5 mm + NBR + AO/TC specification rather than relying on dimensions alone.