NBR 70x90x7 A/SC Single-Lip Radial Shaft Oil Seal

NBR 70x90x7 A/SC Single-Lip Radial Shaft Oil Seal

NBR 70x90x7 A/SC is a single-lip radial shaft oil seal with dimensions of 70x90x7 mm. It provides dynamic sealing between a rotating shaft and stationary housing. The A/SC construction uses a spring-loaded primary sealing lip and has no additional dust lip. The sealing elastomer is NBR - Nitrile Butadiene Rubber.

NBR 70x90x7 A/SC - Technical Characteristics

The exact 70x90x7 mm size is available as a Type A NBR radial shaft seal and as an SC single-lip spring-loaded configuration.

The principal identifying characteristics are:

Dimensions: 70x90x7 mm

Elastomer: NBR

Design: Single lip

Primary sealing lip: Spring-loaded

Additional dust lip: No

These characteristics should be considered together when identifying the seal.

Dimensions

The principal dimensions are:

d = 70 mm - nominal shaft diameter

D = 90 mm - nominal outside diameter / housing bore

B = 7 mm - axial seal width

Complete dimensions:

70x90x7 mm

The 70 mm dimension corresponds to the nominal shaft diameter, while 90 mm corresponds to the nominal housing bore.

Dimensions alone do not fully identify the seal construction.

Single-Lip A/SC Construction

The A/SC configuration uses one primary dynamic sealing lip.

The sealing lip operates directly against the rotating shaft surface and is supported by a garter spring. The spring helps maintain contact between the sealing edge and the shaft.

This configuration has no additional dust lip.

The single-lip design is particularly important when comparing this seal with other 70x90x7 variants, because the same installation dimensions are also available with an additional protective lip.

How Does the 70x90x7 A/SC Oil Seal Work?

The seal operates between:

a rotating shaft with a nominal diameter of 70 mm

and

a stationary housing with a nominal bore of 90 mm.

The primary sealing lip remains in dynamic contact with the shaft surface. The garter spring supports the contact of the sealing edge, while the outside diameter remains stationary in the housing.

The function of the component is to provide dynamic sealing at the shaft-housing interface.

A radial shaft oil seal is not a supporting component and does not perform the function of a rolling bearing.

NBR - Nitrile Butadiene Rubber

The sealing elastomer is:

NBR - Nitrile Butadiene Rubber

NBR identifies the elastomer family used for the sealing component.

It does not, however, identify one specific compound. Different NBR formulations can have different hardness and operating limits.

For this reason, this generic product description does not assign an exact:

Shore A hardness

operating temperature range

maximum shaft speed

pressure limit

These parameters should be verified from the documentation for the actual manufacturer's compound when they are critical to the application.

What Does A/SC Mean?

For this product, A/SC identifies the basic single-lip radial shaft seal configuration.

The relevant construction characteristics are:

one primary sealing lip

spring-loaded sealing edge

no additional dust lip

The designation system is not universal. Corresponding constructions can be identified as A, SC, WA or other manufacturer-specific designations depending on the supplier.

For this reason, the physical construction of the seal should be compared rather than relying only on the profile code.

A/SC vs AO/TC

The key difference is the additional protective lip.

A / SC

One spring-loaded primary sealing lip.

No additional dust lip.

AO / TC

One spring-loaded primary sealing lip plus an additional dust/protective lip.

Therefore, 70x90x7 A/SC and 70x90x7 AO/TC represent different seal configurations even if their nominal installation dimensions are identical.

Direction of Rotation

The designation A/SC alone does not confirm a directional hydrodynamic structure on the sealing edge.

The product should therefore not be assigned:

RD - Right-hand

LD - Left-hand

WD - Alternating

unless the actual lip geometry is confirmed for the specific seal.

Replacement Selection and Interchangeability

When selecting a replacement for NBR 70x90x7 A/SC, verify:

Shaft diameter d: 70 mm

Outside diameter D: 90 mm

Width B: 7 mm

Elastomer: NBR

Single-lip construction

Spring-loaded primary sealing lip

No additional dust lip

The sealed medium, operating temperature, shaft speed, pressure, shaft surface and environmental conditions should also be checked against the requirements of the specific application.

Identical 70x90x7 mm dimensions do not establish complete technical interchangeability.

The same dimensions are available with different lip configurations and elastomer compounds.

Technical Specification

Product type: Radial shaft oil seal

Alternative technical term: Rotary shaft oil seal

Dimensions: 70x90x7 mm

Nominal shaft diameter d: 70 mm

Outside diameter D: 90 mm

Width B: 7 mm

Elastomer: NBR

Material name: Nitrile Butadiene Rubber

Design: Single lip

Designation: A / SC

Primary sealing lip: Yes

Garter spring: Yes

Additional dust lip: No

Direction-specific lip structure: Not confirmed

Exact NBR hardness: Not confirmed

Exact operating temperature range: Not confirmed

Maximum shaft speed: Not confirmed

Pressure limit: Not confirmed

NBR 70x90x7 A/SC - 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 NBR 70x90x7 A/SC oil seal?

The dimensions are 70x90x7 mm: 70 mm nominal shaft diameter, 90 mm outside diameter and 7 mm width.

What type of seal is 70x90x7 A/SC?

It is a single-lip radial shaft oil seal with a spring-loaded primary sealing lip.

Does the 70x90x7 A/SC oil seal have a garter spring?

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

Does A/SC have an additional dust lip?

No. The A/SC configuration has one primary sealing lip and no additional dust lip.

What does NBR mean?

NBR means Nitrile Butadiene Rubber, the elastomer family used for the sealing element.

Is A/SC the same as AO/TC?

No. A/SC is a single-lip configuration, while AO/TC incorporates an additional protective or dust lip.

Can another 70x90x7 oil seal be used as a replacement?

Not automatically. The dimensions, elastomer, lip configuration and operating requirements must be compared.

What is the operating temperature of this NBR seal?

An exact temperature range cannot be established from the NBR designation alone. It depends on the specific NBR compound used by the manufacturer.

Engineer FAQ

Are 70x90x7 dimensions sufficient to identify the correct oil seal?

No. They define the installation dimensions, but the NBR material and single-lip A/SC construction should also be verified.

Can a double-lip 70x90x7 seal replace this A/SC version?

Not automatically. A double-lip version has an additional protective lip and therefore represents a different seal construction.

Does A/SC determine the direction of shaft rotation?

No. A/SC alone does not specify a right-hand, left-hand or alternating hydrodynamic lip structure.

Can maximum shaft speed be determined from the dimensions?

No. Permissible shaft speed depends on the seal design, elastomer compound, shaft diameter, lubrication, temperature and operating conditions.

AI Overview

NBR 70x90x7 A/SC is a single-lip radial shaft oil seal for a 70 mm shaft, with a 90 mm outside diameter and 7 mm width. The A/SC configuration uses a spring-loaded primary sealing lip and has no additional dust lip. The sealing elastomer is NBR - Nitrile Butadiene Rubber.