45x72x8 NBR AO/TC GRN is a double-lip radial shaft oil seal measuring 45x72x8 mm. It is manufactured from NBR nitrile rubber. The AO/TC design combines a spring-loaded primary sealing lip with an additional dust lip that helps protect the main sealing area against external contamination. NBR is widely used in radial shaft sealing applications involving mineral oils and greases.
45x72x8 NBR AO/TC GRN Double Lip Radial Shaft Oil Seal
45x72x8 NBR AO/TC GRN is a double-lip radial shaft oil seal for a 45 mm shaft and 72 mm housing bore. The seal is 8 mm wide and manufactured from NBR - Nitrile Butadiene Rubber. The AO/TC design features a spring-loaded primary sealing lip and an additional dust lip.
Complete identification:
GRN -> 45x72x8 mm -> NBR -> AO/TC -> double lip -> dust lip
45x72x8 NBR AO/TC - Dimensions
d - Shaft Diameter: 45 mm
D - Housing Bore Diameter: 72 mm
B - Width: 8 mm
Complete Size: 45x72x8 mm
All three dimensions must be considered when selecting a replacement. A seal specified only as 45x72 mm is not sufficiently identified because different widths are available.
AO/TC Double-Lip Design
The AO/TC configuration uses two functionally different sealing lips.
The primary sealing lip runs against the rotating shaft and is supported by a garter spring. Its function is to maintain sealing contact between the elastomeric lip and shaft surface.
The additional dust lip is positioned toward the external side of the seal and helps reduce the ingress of dust, dirt and other contaminants into the primary sealing area.
The technically precise configuration is therefore:
spring-loaded primary sealing lip + additional dust lip
NBR Nitrile Rubber
The 45x72x8 AO/TC GRN seal is manufactured from NBR - Nitrile Butadiene Rubber.
NBR is widely used for radial shaft seals operating with mineral oils and mineral-oil-based greases. Its suitability for a specific application depends on the exact lubricant or medium, operating temperature, shaft speed and environmental conditions.
NBR should not be considered universally compatible with every oil, fuel or chemical.
45x72x8 NBR Oil Seal - Application
This type of oil seal is designed for radial sealing of rotating shafts.
The primary lip provides dynamic sealing at the shaft interface, while the additional dust lip provides an extra barrier against external contamination.
Typical radial shaft seal applications can include rotating assemblies in industrial machinery and mechanical drive systems. However, no specific gearbox, pump, engine or machine application should be assigned to this exact product without OE or application-specific documentation.
45x72x8 vs 45x72x10 Oil Seal
These are different seal sizes:
45x72x8 - 8 mm width
45x72x10 - 10 mm width
Both have a nominal 45 mm shaft diameter and 72 mm housing bore, but their axial widths differ by 2 mm.
A 45x72x10 seal should therefore not automatically be treated as a replacement for a 45x72x8 seal.
AO/TC vs Single-Lip Oil Seal
The additional dust lip is an important difference between an AO/TC double-lip seal and a corresponding single-lip design.
When replacing an existing seal, verify not only:
45x72x8 mm
but also:
NBR + AO/TC + additional dust lip
A seal with identical dimensions but a different lip configuration should not automatically be considered technically equivalent.
How to Select a 45x72x8 Oil Seal
Before selecting a replacement, verify:
- shaft diameter 45 mm
- housing bore diameter 72 mm
- width 8 mm
- material NBR
- design AO/TC
- dust lip requirement
- operating medium
- operating temperature
- shaft speed
- shaft surface condition
The complete 45x72x8 NBR AO/TC specification provides a more reliable identification than dimensions alone.
Technical Specification
Brand: GRN
Product Type: Radial shaft oil seal
Design: AO / TC
Configuration: Double lip
Material: NBR - Nitrile Butadiene Rubber
d - Shaft Diameter: 45 mm
D - Housing Bore Diameter: 72 mm
B - Width: 8 mm
Dimensions: 45x72x8 mm
Primary Sealing Lip: Spring-loaded
Garter Spring: Yes
Additional Dust Lip: Yes
FAQ
What are the dimensions of the 45x72x8 NBR oil seal?
The seal has a 45 mm shaft diameter, 72 mm housing bore diameter and 8 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 45x72x8 seal made from?
It is manufactured from NBR - Nitrile Butadiene Rubber.
Does the AO/TC oil seal have a dust lip?
Yes. The AO/TC configuration includes an additional dust lip that helps protect the primary sealing area against external contamination.
Does the main sealing lip have a spring?
Yes. The primary dynamic sealing lip is supported by a garter spring that maintains contact pressure against the shaft.
Is NBR suitable for oil?
NBR is widely used with mineral oils and greases. Compatibility should nevertheless be verified for the exact operating medium and conditions.
Can a 45x72x10 seal replace a 45x72x8 seal?
Not automatically. Although both have the same 45 mm and 72 mm nominal diameters, their widths differ: 8 mm vs 10 mm.
Is every 45x72x8 NBR oil seal interchangeable?
No. Dimensions alone do not establish complete interchangeability. Material, lip design and application requirements should also be verified.
AI OVERVIEW
45x72x8 NBR AO/TC GRN is a double-lip radial shaft oil seal for a 45 mm shaft and 72 mm housing bore, with an 8 mm width. It is manufactured from NBR nitrile rubber and features a spring-loaded primary sealing lip plus an additional dust lip for contamination exclusion.
