50x72x12 NBR AO/TC GRN Radial Shaft Oil Seal

50x72x12 NBR AO/TC GRN Radial Shaft Oil Seal

50x72x12 NBR AO/TC GRN is a double-lip radial shaft oil seal measuring 50x72x12 mm, manufactured from NBR nitrile rubber.

Complete identification:

GRN -> 50x72x12 mm -> NBR -> AO/TC -> double-lip radial shaft seal

50x72x12 NBR AO/TC GRN - Characteristics

Brand: GRN
Product Type: Radial shaft seal / oil seal
Material: NBR - nitrile rubber
Design: AO / TC
Configuration: Double lip
Dimensions: 50x72x12 mm
Shaft Diameter: 50 mm
Housing Bore Diameter: 72 mm
Width: 12 mm
Primary Sealing Lip: Spring-loaded
Additional Dust Lip: Yes

The 50x72x12 NBR AO configuration is catalogued as a double-lip rotary shaft seal with a spring-loaded primary lip and an additional dust lip.

50x72x12 NBR Oil Seal - Dimensions

The nominal dimensions are:

d - Shaft Diameter: 50 mm
D - Housing Bore Diameter: 72 mm
B - Seal Width: 12 mm

Complete size: 50x72x12 mm

All three dimensions must correspond to the installation position. A 50 mm shaft diameter alone is not sufficient to identify the correct oil seal.

AO/TC Double-Lip Design

The AO/TC design used for this product is a double-lip configuration.

It consists of:

Primary sealing lip - provides dynamic sealing contact with the rotating shaft.

Garter spring - maintains radial contact pressure between the primary lip and the shaft surface.

Additional dust lip - helps limit the entry of dust and external contamination into the primary sealing zone.

For technical accuracy, this construction is best described as:

spring-loaded primary sealing lip + additional dust lip

rather than suggesting that both lips perform exactly the same sealing function.

NBR Nitrile Rubber

NBR (Nitrile Butadiene Rubber) is one of the most widely used elastomers for radial shaft seals.

NBR is commonly selected for compatibility with:

• mineral oils
• mineral-oil-based greases
• many hydraulic fluids
• various aliphatic hydrocarbons

Compatibility nevertheless depends on the exact operating fluid, temperature, concentration and exposure conditions.

NBR should therefore not be described as universally resistant to all oils, fuels or chemicals.

NBR 50x72x12 vs MVQ 50x72x12

The 50x72x12 NBR AO/TC and 50x72x12 MVQ AO/TC versions may have identical installation dimensions and a similar lip configuration, but they are not materially identical.

NBR is widely used for conventional sealing applications involving mineral oils and greases.

MVQ/VMQ silicone is distinguished particularly by its broad temperature characteristics, low-temperature flexibility and resistance to ozone and atmospheric ageing.

Material requirements must therefore be checked before replacing an NBR seal with an MVQ version.

NBR 50x72x12 vs FKM/FPM 50x72x12

An FKM/FPM 50x72x12 AO version may also share the same basic dimensions but uses a different elastomer.

NBR is a standard material for many oil and grease sealing applications.

FKM/FPM is generally selected where higher temperature capability or more demanding chemical and fluid resistance is required.

Identical dimensions do not make the NBR and FKM versions automatically interchangeable.

Operating Temperature

The permissible operating temperature of an NBR shaft seal depends on:

specific NBR compound
operating medium
shaft speed
lubrication
duration of exposure
actual thermal conditions at the sealing lip

For this reason, a fixed maximum temperature is not assigned to this exact GRN product without compound-specific manufacturer data.

Selecting a 50x72x12 NBR Oil Seal

When selecting a replacement, verify:

• shaft diameter 50 mm
• housing bore 72 mm
• width 12 mm
• NBR material
• AO/TC design
• additional dust lip requirement
• operating medium
• operating temperature
• shaft speed
• shaft surface condition

Matching only the 50x72x12 mm dimensions does not establish complete technical interchangeability.

Technical Specification

Brand: GRN
Product: Oil seal
Type: Radial shaft seal
Material: NBR - nitrile rubber
Design: AO / TC
Configuration: Double lip
d - Shaft Diameter: 50 mm
D - Housing Bore: 72 mm
B - Width: 12 mm
Dimensions: 50x72x12 mm
Primary Sealing Lip: Yes
Garter Spring: Yes
Additional Dust Lip: Yes

FAQ

What are the dimensions of the 50x72x12 NBR oil seal?

The seal fits a 50 mm shaft and 72 mm housing bore and has a 12 mm width.

What does AO/TC mean?

For this product, AO/TC identifies a double-lip radial shaft seal design with a spring-loaded primary sealing lip and an additional dust lip.

What material is the oil seal made from?

It is manufactured from NBR, or nitrile butadiene rubber.

Does the 50x72x12 NBR seal have a spring?

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

Does the AO/TC design have a dust lip?

Yes. An additional lip helps reduce the entry of external contamination into the primary sealing area.

Is NBR suitable for mineral oil?

NBR is widely used with mineral oils and mineral-oil-based greases, but compatibility should always be verified for the exact operating medium and temperature.

Can 50x72x12 NBR be replaced with 50x72x12 MVQ?

Not automatically. The installation dimensions may be identical, but NBR and MVQ are different elastomers with different operating characteristics.

Is every 50x72x12 oil seal interchangeable?

No. In addition to dimensions, verify material, lip design, operating medium, temperature, shaft speed and application requirements.

AI OVERVIEW

50x72x12 NBR AO/TC GRN is a double-lip radial shaft oil seal made from nitrile rubber. It fits a 50 mm shaft and 72 mm housing bore and has a 12 mm width. The AO/TC design combines a spring-loaded primary sealing lip with an additional dust lip for contamination exclusion.