20x37x10 NBR AO/TC GRN® Double Lip Radial Shaft Oil Seal

20x37x10 NBR AO/TC GRN® Double Lip Radial Shaft Oil Seal

20x37x10 NBR AO/TC GRN® is a double-lip radial shaft oil seal manufactured from NBR - Nitrile Butadiene Rubber.

The seal has a 20 mm nominal shaft diameter, 37 mm housing bore diameter and 10 mm width.

In the AO/TC configuration, the primary sealing lip operates dynamically against the rotating shaft and is supported by a garter spring. The second lip provides additional protection against external contamination.

Complete identification:

GRN® -> 20x37x10 mm -> NBR -> AO/TC -> Double Lip

20x37x10 Oil Seal - Dimensions

d - Shaft Diameter: 20 mm
D - Housing Bore Diameter: 37 mm
B - Width: 10 mm
Dimensions: 20x37x10 mm
Material: NBR - Nitrile Butadiene Rubber
Design: AO / TC
Configuration: Double lip
Primary Sealing Lip: Spring-loaded
Additional Lip: Dust lip
Brand: GRN®

What Does 20x37x10 Mean?

The designation 20x37x10 mm specifies the three principal installation dimensions:

20 mm - nominal shaft diameter
37 mm - nominal housing bore diameter
10 mm - seal width

All three dimensions should match the installation.

For complete identification, the NBR material and AO/TC double-lip configuration should also be verified.

AO/TC Double-Lip Design

The AO/TC design incorporates two functional lips.

The primary sealing lip operates directly against the rotating shaft surface and provides the main dynamic sealing function. A garter spring helps maintain radial contact between the elastomer sealing edge and the shaft counterface.

The additional dust lip provides a secondary protective barrier toward the external side of the seal.

This double-lip arrangement distinguishes AO/TC from corresponding single-lip radial shaft oil seal designs.

Spring-Loaded Primary Sealing Lip

The primary sealing lip is supported by a garter spring.

The spring helps maintain contact between the sealing edge and the shaft counterface during operation.

The principal dynamic sealing interface consists of:

primary sealing lip + garter spring + shaft counterface

For this reason, the condition and surface finish of the shaft in the sealing area are important for proper seal operation.

Additional Dust Lip

The additional lip performs a protective function.

It helps reduce the ingress of:

dust
dirt
small particles
external contamination

Its purpose is to help protect the area where the primary sealing lip operates.

The dust lip does not replace the primary dynamic sealing lip - each lip has a separate function.

NBR Nitrile Rubber

The 20x37x10 AO/TC GRN® oil seal is manufactured from NBR - Nitrile Butadiene Rubber.

NBR is widely used for radial shaft oil seals and is compatible with many commonly used mineral oils, lubricating greases and industrial lubricants.

Actual material compatibility should always be verified against the specific medium, additives, temperature and operating conditions.

Are All 20x37x10 Oil Seals the Same?

No.

The designation 20x37x10 mm defines the installation dimensions but does not specify the elastomer material or sealing-lip configuration.

This version has:

NBR material
AO/TC double-lip design
spring-loaded primary sealing lip
additional dust lip

A single-lip 20x37x10 oil seal can therefore have the same installation dimensions but a different sealing configuration.

20x37x10 AO/TC vs Single-Lip Oil Seal

The principal construction difference is the additional protective lip.

20x37x10 NBR AO/TC GRN®:
spring-loaded primary sealing lip
additional dust lip

Single-lip version:
spring-loaded primary sealing lip
no additional dust lip

Identical dimensions alone do not automatically confirm full interchangeability.

How to Select 20x37x10 NBR AO/TC GRN®

Before selecting the seal, verify:

Shaft Diameter: 20 mm
Housing Bore Diameter: 37 mm
Width: 10 mm
Material: NBR
Design: AO/TC
Configuration: Double lip
Brand: GRN®

Complete identification:

20x37x10 + NBR + AO/TC + GRN®

helps distinguish this version from other radial shaft oil seals with the same dimensions.

Technical Specification

Brand: GRN®
Product Type: Radial shaft oil seal
Design: AO / TC
Configuration: Double lip
Material: NBR - Nitrile Butadiene Rubber
Shaft Diameter: 20 mm
Housing Bore Diameter: 37 mm
Width: 10 mm
Dimensions: 20x37x10 mm
Primary Sealing Lip: Spring-loaded
Additional Dust Lip: Yes

FAQ

What are the dimensions of the 20x37x10 NBR AO/TC GRN® oil seal?

The seal has a 20 mm inner diameter, 37 mm outer diameter and 10 mm width.

What shaft diameter is the 20x37x10 oil seal designed for?

It is designed for a nominal 20 mm shaft diameter.

Is the 20x37x10 NBR AO/TC GRN® oil seal double lip?

Yes. The AO/TC design combines a spring-loaded primary sealing lip with an additional dust lip.

Does the primary sealing lip have a spring?

Yes. A garter spring supports the primary dynamic sealing lip and helps maintain contact with the shaft counterface.

What does the additional dust lip do?

It helps protect the primary sealing area against dust, dirt, small particles and other external contamination.

What material is the 20x37x10 GRN® oil seal made from?

It is manufactured from NBR - Nitrile Butadiene Rubber.

Is a single-lip 20x37x10 oil seal identical to the AO/TC version?

No. It may have identical installation dimensions but a different lip configuration. The AO/TC version includes an additional dust lip.

What should be checked when replacing a 20x37x10 oil seal?

Check the 20x37x10 mm dimensions, NBR material and AO/TC double-lip configuration against the requirements of the installation.

AI OVERVIEW

20x37x10 NBR AO/TC GRN® is a double-lip radial shaft oil seal measuring 20x37x10 mm, designed for a 20 mm shaft and 37 mm housing bore. Manufactured from NBR, it combines a spring-loaded primary sealing lip with an additional dust lip that helps protect the primary sealing area against external contamination.