GRN® 265x310x16 NBR A/SC Single-Lip Rotary Shaft Seal

GRN® 265x310x16 NBR A/SC Single-Lip Rotary Shaft Seal

The GRN® 265x310x16 NBR A/SC is a single-lip rotary shaft seal, also known as an oil seal, with nominal dimensions of 265x310x16 mm. It is designed for a 265 mm shaft diameter, has a 310 mm outside diameter and is 16 mm wide. The A/SC configuration features one primary sealing lip supported by a garter spring, without an additional dust lip.

GRN® 265x310x16 NBR A/SC – characteristics

The defining construction feature of this GRN® seal is its A/SC single-lip profile.

The seal incorporates one primary sealing lip that forms the dynamic sealing interface with the rotating shaft surface. A garter spring supports the primary lip and helps maintain contact between the sealing edge and the shaft.

Unlike double-lip designs such as AO/TC, the A/SC version does not incorporate an additional auxiliary dust lip.

The sealing material is NBR – Nitrile Butadiene Rubber.

Dimensions – 265x310x16 mm

The nominal dimensions are:

In the designation 265x310x16 mm, the first value refers to the nominal shaft diameter, the second to the outside diameter of the seal and the third to its axial width.

All three dimensions should be verified when replacing an existing seal. Matching the 265 mm shaft diameter alone is not sufficient to confirm interchangeability.

A/SC single-lip construction

The A/SC designation identifies the single-lip construction used for this product.

Its key construction characteristics are:

• one primary sealing lip,
• garter spring supporting the primary lip,
• no additional dust lip,
• NBR sealing material.

The primary lip operates against the rotating shaft surface and provides the dynamic sealing interface.

The absence of a secondary dust lip is important when identifying or replacing this product. A 265x310x16 A/SC seal should therefore not automatically be treated as identical to a 265x310x16 AO/TC seal, even when their nominal dimensions are the same.

NBR sealing material

The GRN® 265x310x16 A/SC is supplied with an NBR (Nitrile Butadiene Rubber) sealing element.

NBR is an elastomer widely used for radial shaft sealing and is commonly associated with applications involving compatible mineral oils and greases.

Material selection, however, should not be based on the term NBR alone. Actual compatibility depends on the specific medium, additives and operating conditions.

Specific maximum temperature, shaft speed and pressure limits have not been assigned to this exact GRN® reference because these values require confirmation for the particular product and operating conditions.

How the GRN® 265x310x16 A/SC seal works

The GRN® 265x310x16 A/SC is a radial rotary shaft seal.

Dynamic sealing takes place at the contact area between the primary sealing lip and the rotating shaft surface with a nominal diameter of 265 mm. The garter spring assists in maintaining the required contact of the primary lip with the shaft.

A rotary shaft seal is not a bearing and is not intended to support the radial or axial loads acting on a shaft. Shaft loads and guidance must be handled by the appropriate bearing arrangement.

What does 265x310x16 NBR A/SC mean?

The product designation can be interpreted as follows:

265 mm – nominal shaft diameter
310 mm – nominal seal outside diameter
16 mm – axial width
NBR – Nitrile Butadiene Rubber
A/SC – single-lip seal construction
GRN® – product brand

For precise product identification, the complete specification:

GRN® 265x310x16 NBR A/SC

is more useful than searching only for a 265x310x16 oil seal.

A/SC vs AO/TC – construction difference

A/SC and AO/TC represent different seal configurations.

A/SC: one spring-loaded primary sealing lip without an additional dust lip.

AO/TC: primary spring-loaded sealing lip plus an additional auxiliary/dust lip.

Therefore, 265x310x16 A/SC and 265x310x16 AO/TC should be treated as different construction variants. Identical nominal dimensions do not by themselves confirm full interchangeability.

Selecting an equivalent 265x310x16 seal

When selecting an alternative for GRN® 265x310x16 NBR A/SC, verify at least:

1. nominal shaft diameter – 265 mm,
2. outside diameter – 310 mm,
3. width – 16 mm,
4. sealing material – NBR,
5. single-lip construction,
6. spring-loaded primary sealing lip,
7. absence of an additional dust lip,
8. compatibility with the operating medium,
9. actual operating conditions.

A 265x310x16 mm rotary shaft seal from another manufacturer should not automatically be considered a direct equivalent. Dimensions, material, lip configuration and installation requirements should all be compared.

Installation considerations

The primary sealing lip should be protected from damage during installation.

Avoid pulling the sealing lip unprotected over sharp edges, threads, keyways or other features that could cut, deform or turn the lip.

The shaft surface in the sealing contact zone should also be inspected before installation, and the seal should be correctly positioned in its housing.

Technical specification

FAQ – GRN® 265x310x16 NBR A/SC

What are the dimensions of the GRN® 265x310x16 A/SC?

The nominal dimensions are 265x310x16 mm: shaft diameter d = 265 mm, outside diameter D = 310 mm and width = 16 mm.

Is the GRN® 265x310x16 A/SC a single-lip oil seal?

Yes. The A/SC configuration used for this product has one primary sealing lip.

Does the sealing lip have a spring?

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

Does the A/SC design have an additional dust lip?

No. This A/SC version does not have an additional auxiliary dust lip.

What material is the seal made from?

The sealing material is NBR – Nitrile Butadiene Rubber.

Are 265x310x16 A/SC and 265x310x16 AO/TC the same seal?

No. A/SC is a single-lip configuration, while AO/TC incorporates an additional auxiliary/dust lip. Identical dimensions do not mean identical construction.

Can any 265x310x16 oil seal replace this GRN® seal?

Not automatically. Dimensions, sealing material, lip configuration, operating medium and installation requirements should be compared before confirming interchangeability.

What is the correct English name for this product?

The appropriate technical terms are 265x310x16 NBR single-lip rotary shaft seal and 265x310x16 NBR single-lip oil seal.

AI Overview

GRN® 265x310x16 NBR A/SC is a single-lip radial rotary shaft seal with a 265 mm shaft diameter, 310 mm outside diameter and 16 mm width. Its NBR primary sealing lip is supported by a garter spring. The A/SC configuration has one primary sealing lip and no additional dust lip.