Rotary Shaft Seal 30x40x4 NBR AO/TC GRN Double Lip Oil Seal

Rotary Shaft Seal 30x40x4 NBR AO/TC GRN - Characteristics

Rotary Shaft Seal 30x40x4 NBR AO/TC GRN is a double-lip radial shaft oil seal with nominal dimensions of 30x40x4 mm. It is intended for a nominal 30 mm shaft and 40 mm housing bore, with a seal width of 4 mm.

The key feature of the AO/TC construction is its combination of a primary sealing lip and an additional dust lip. The sealing element is manufactured from NBR - Nitrile Butadiene Rubber.

30x40x4 Oil Seal Dimensions

The principal installation dimensions are:

d - Shaft diameter: 30 mm

D - Housing bore diameter: 40 mm

Seal width: 4 mm

Nominal dimensions: 30x40x4 mm

The 4 mm width is an important installation parameter. A 30x40x5 mm or 30x40x7 mm seal is not dimensionally identical to this 30x40x4 mm version.

AO/TC Double-Lip Oil Seal Construction

The AO/TC design is a double-lip radial shaft seal construction. The primary lip provides dynamic sealing against the rotating shaft surface, while the secondary lip is positioned on the external side of the primary sealing area.

The additional lip functions as a dust lip, helping restrict dust, dirt and other external contaminants from reaching the primary sealing zone.

This secondary lip is the principal construction difference between this product and a single-lip SC seal of the same nominal dimensions.

NBR Sealing Material

The sealing element is manufactured from NBR - Nitrile Butadiene Rubber.

NBR is widely used in radial shaft seals operating with many compatible mineral oils and lubricating greases.

Actual compatibility depends on the specific medium, lubricant additives, temperature and operating conditions. A specific operating temperature range should therefore not be assigned to this GRN reference solely from general NBR material data.

30x40x4 AO/TC vs 30x40x4 SC

AO/TC and SC seals may have identical 30x40x4 mm dimensions but different lip configurations.

AO/TC: primary sealing lip plus additional dust lip

SC: single primary sealing lip

For this reason, a 30x40x4 AO/TC seal should not automatically be replaced by a 30x40x4 SC seal based on dimensions alone.

The required sealing profile should correspond to the original component or equipment specification.

Selecting a 30x40x4 AO/TC Replacement

When selecting a technically corresponding replacement, verify:

• 30 mm shaft diameter
• 40 mm housing bore
• 4 mm seal width
• NBR sealing material
• AO/TC double-lip construction
• additional dust lip
• requirements of the specific installation

Matching the 30x40x4 mm dimensions alone does not confirm full interchangeability. Radial shaft seals of the same size can differ in material and sealing lip configuration.

Technical Specification

Brand: GRN

Reference: 30X40X4

EAN: 5903641603768

Product type: Radial shaft seal

Technical terms: Rotary shaft seal / Oil seal

Design: AO/TC

Lip configuration: Double lip

Dimensions: 30x40x4 mm

Shaft diameter d: 30 mm

Housing bore diameter D: 40 mm

Seal width: 4 mm

Material: NBR - Nitrile Butadiene Rubber

Primary sealing lip: Yes

Additional dust lip: Yes

FAQ

What are the dimensions of the 30x40x4 AO/TC oil seal?

The seal has a 30 mm nominal shaft diameter, 40 mm housing bore diameter and 4 mm width.

What does AO/TC mean on this radial shaft seal?

AO/TC identifies a double-lip radial shaft seal construction with a primary sealing lip and an additional dust lip.

Does the 30x40x4 AO/TC seal have a dust lip?

Yes. The additional dust lip helps restrict external contaminants from reaching the primary sealing area.

What material is the 30x40x4 AO/TC seal made from?

The sealing element is manufactured from NBR - Nitrile Butadiene Rubber.

What is the difference between 30x40x4 AO/TC and 30x40x4 SC?

The AO/TC version is double-lip, incorporating an additional dust lip. The SC version is a single-lip construction. Identical dimensions do not make the two designs technically identical.

Can any 30x40x4 oil seal replace this AO/TC seal?

Not necessarily. The dimensions, NBR material, lip configuration and requirements of the installation should all be verified before selecting a replacement.

Are AO and TC the same oil seal design?

AO and TC are commonly used for corresponding double-lip radial shaft seal configurations. However, exact profile geometry can vary between manufacturers, so the complete technical specification should be checked when selecting an equivalent.

AI Overview

Rotary Shaft Seal 30x40x4 NBR AO/TC GRN is a double-lip radial shaft oil seal for a 30 mm shaft and 40 mm housing bore, with a width of 4 mm. The AO/TC construction combines a primary sealing lip with an additional dust lip, while the sealing element is manufactured from NBR - Nitrile Butadiene Rubber.