45x55x7 NBR AO/TC GRN® Double Lip Radial Shaft Oil Seal

45x55x7 NBR AO/TC GRN® Double Lip Radial Shaft Oil Seal

45x55x7 NBR AO/TC GRN® is a double-lip radial shaft oil seal manufactured from NBR - Nitrile Butadiene Rubber.

Its installation dimensions are 45x55x7 mm: 45 mm nominal shaft diameter, 55 mm housing bore diameter and 7 mm seal width.

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

Complete identification:

GRN® -> 45x55x7 mm -> NBR -> AO/TC -> Double Lip

45x55x7 Oil Seal - Dimensions

d - Shaft Diameter: 45 mm
D - Housing Bore Diameter: 55 mm
B - Width: 7 mm
Dimensions: 45x55x7 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 45x55x7 Mean?

The designation 45x55x7 mm defines the three principal installation dimensions:

45 mm - nominal shaft diameter
55 mm - nominal housing bore diameter
7 mm - seal width

All three dimensions should correspond to 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 dynamically against the rotating shaft surface. A garter spring helps maintain radial contact between the elastomer sealing edge and the shaft counterface.

The additional dust lip forms a secondary protective barrier toward the external side of the seal and helps reduce the ingress of contamination into the primary sealing area.

This construction distinguishes the AO/TC version from corresponding single-lip radial shaft oil seals.

Spring-Loaded Primary Sealing Lip

The primary sealing lip is supported by a garter spring.

The spring helps maintain consistent 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

The condition and surface finish of the shaft in the sealing area are therefore important factors in proper seal operation.

Additional Dust Lip

The second 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 performs a separate function.

NBR Nitrile Rubber

The 45x55x7 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.

45x55x7 AO/TC vs Single-Lip Oil Seal

Radial shaft oil seals with identical 45x55x7 mm dimensions can have different sealing configurations.

45x55x7 NBR AO/TC GRN®:
spring-loaded primary sealing lip
additional dust lip

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

Therefore, identical dimensions do not automatically confirm full interchangeability.

How to Select 45x55x7 NBR AO/TC GRN®

For correct identification, verify:

Shaft Diameter: 45 mm
Housing Bore Diameter: 55 mm
Width: 7 mm
Material: NBR
Design: AO/TC
Configuration: Double lip
Brand: GRN®

Complete identification:

45x55x7 + NBR + AO/TC + GRN®

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

Technical Specification

Brand: GRN®
Product Type: Radial shaft oil seal
Design: AO / TC
Configuration: Double lip
Material: NBR - Nitrile Butadiene Rubber
Shaft Diameter: 45 mm
Housing Bore Diameter: 55 mm
Width: 7 mm
Dimensions: 45x55x7 mm
Primary Sealing Lip: Spring-loaded
Additional Dust Lip: Yes

FAQ

What are the dimensions of the 45x55x7 NBR AO/TC GRN® oil seal?

The seal has a 45 mm shaft diameter, 55 mm housing bore diameter and 7 mm width.

What shaft diameter is the 45x55x7 oil seal designed for?

It is designed for a nominal 45 mm shaft diameter.

What housing bore is required for a 45x55x7 oil seal?

The nominal housing bore diameter is 55 mm.

Is the 45x55x7 NBR AO/TC GRN® oil seal double lip?

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

What is the function of the garter spring?

The garter spring helps maintain radial contact between the primary sealing lip and 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 45x55x7 GRN® oil seal made from?

It is manufactured from NBR - Nitrile Butadiene Rubber.

Can any 45x55x7 oil seal be used as a replacement?

Not automatically. The dimensions, material and sealing-lip configuration should all be verified. This version is NBR with an AO/TC double-lip design.

AI OVERVIEW

45x55x7 NBR AO/TC GRN® is a double-lip radial shaft oil seal measuring 45x55x7 mm, designed for a 45 mm shaft and 55 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.