55x90x8 NBR AO / TC double-lip radial rotary shaft seal. 55 mm inside diameter, 90 mm outside diameter and 8 mm width. Manufactured from NBR nitrile rubber. AO / TC construction features a primary sealing lip and an additional dust lip that helps protect the sealing area against external contamination. GRN brand, product code US-NBR-AO-55-90-8. Available from simmering.pl, stock in Poland with worldwide shipping.
55x90x8 NBR AO / TC is a double-lip radial rotary shaft seal designed for sealing rotating shafts. Manufactured from NBR nitrile rubber, it features a primary sealing lip and an additional dust lip that provides extra protection against external contamination. The nominal dimensions are 55x90x8 mm: 55 mm inside diameter, 90 mm outside diameter and 8 mm width.
| Specification | Value |
|---|---|
| Product Type | Radial rotary shaft seal / oil seal |
| Profile | AO / TC |
| Construction | Double lip |
| Material | NBR |
| Material Name | Nitrile rubber |
| Inside Diameter | 55 mm |
| Outside Diameter | 90 mm |
| Width | 8 mm |
| Dimensions | 55x90x8 mm |
| Primary Sealing Lip | Yes |
| Additional Dust Lip | Yes |
| Brand at simmering.pl | GRN |
| Product Code | US-NBR-AO-55-90-8 |
| EAN | 5903641606974 |
The dimensional designation:
55x90x8 mm
means:
55 mm - inside diameter, corresponding to the nominal shaft diameter
90 mm - outside diameter, corresponding to the nominal housing bore
8 mm - axial width of the seal
All three dimensions should be verified when selecting a replacement radial shaft seal.
The designations AO and TC are used in the sealing industry for double-lip radial shaft seal designs with a similar functional configuration.
This seal incorporates:
Primary sealing lip - operates against the rotating shaft surface and provides the main sealing function.
Additional dust lip - located on the environmental side and provides an additional barrier against dust, dirt and other external contaminants.
This double-lip configuration makes the AO / TC design particularly useful where both fluid retention and additional protection against external contamination are required.
The 55x90x8 AO / TC oil seal is manufactured from NBR - nitrile rubber.
NBR is one of the most widely used elastomers for radial rotary shaft seals and is commonly used in appropriately specified systems involving compatible oils and lubricants.
Material selection should always take into account:
operating medium
temperature
shaft surface speed
lubrication
shaft surface condition
application requirements
Exact maximum temperature, pressure or shaft-speed limits should not be assigned to this particular seal solely from generic NBR properties.
A radial rotary shaft seal creates a sealing interface between a rotating shaft and a stationary housing.
The 55 mm inside diameter corresponds to the nominal shaft diameter.
The 90 mm outside diameter fits into the corresponding housing bore.
The primary sealing lip operates against the shaft surface and performs the main sealing function.
The additional dust lip provides a secondary barrier on the environmental side, helping protect the primary sealing area against external contamination.
The additional lip is an important feature of the double-lip AO / TC construction.
Its primary purpose is to help limit the entry of:
dust
dirt
fine particles
other external contaminants
into the main sealing area.
This distinguishes a double-lip seal from many basic single-lip radial shaft seal designs.
Radial shaft seals of this type may be used in appropriately designed assemblies such as:
gearboxes
speed reducers
industrial machinery
agricultural machinery
drive systems
pumps and rotating equipment
mechanical assemblies requiring separation of lubricant from the external environment
The exact suitability of the seal should always be determined from its dimensions, material, construction and the operating conditions of the specific application.
Different manufacturers use different nomenclature systems for radial shaft seal profiles.
A functionally similar double-lip construction may be described in the market using designations such as:
AO
TC
RST
BASL
These designations should not automatically be considered identical.
Profile nomenclature is manufacturer-specific, and actual construction can vary.
When cross-referencing seals, compare:
55x90x8 mm dimensions
NBR material
double-lip construction
outside diameter design
sealing-lip geometry
application requirements
rather than relying on the profile abbreviation alone.
No.
Radial shaft seals with identical 55x90x8 mm dimensions may have different materials and constructions.
Possible differences include:
single-lip or double-lip design
NBR or FKM/FPM elastomer
different sealing-lip geometry
different outside diameter construction
different application requirements
Therefore, dimensions alone do not establish complete interchangeability.
For this product, the important identification parameters are:
55x90x8 mm
NBR
AO / TC
double-lip construction
An NBR and an FKM/FPM seal with the same 55x90x8 mm dimensions should not automatically be treated as interchangeable.
The elastomers have different characteristics, and the correct material depends on factors such as operating medium, temperature and application requirements.
If the original assembly specifies NBR, a change to another elastomer should be evaluated against the technical requirements of the application rather than based solely on dimensions.
Before ordering, verify:
When replacing an existing seal, compare its construction and profile with the new component whenever possible.
Before installation, thoroughly clean the shaft and housing bore.
Inspect the shaft sealing surface for:
scratches
corrosion
burrs
sharp edges
excessive wear grooves
The seal should be installed evenly and squarely using a suitable installation tool.
Do not hammer directly on the sealing element.
When the sealing lip must pass over threads, keyways, splines or sharp edges, protect it against cutting or deformation.
The correct orientation of the primary sealing lip and additional dust lip should be confirmed before final installation.
The nominal dimensions are 55x90x8 mm: 55 mm inside diameter, 90 mm outside diameter and 8 mm width.
The seal is manufactured from NBR nitrile rubber.
Yes. It is a double-lip radial shaft seal with a primary sealing lip and an additional dust lip.
TC is a widely used designation for a radial shaft seal construction incorporating a primary sealing lip and an additional dust lip.
The additional lip provides an extra barrier against dust, dirt and other external contamination reaching the primary sealing area.
They are used for designs with a similar functional configuration, but seal nomenclature varies between manufacturers. Actual construction, dimensions and material should be compared before substitution.
Not automatically. Seals with identical dimensions can differ in material, profile, lip configuration and intended operating conditions.
NBR is widely used in sealing applications involving appropriately selected oils and lubricants. Compatibility should always be evaluated for the specific fluid and operating temperature.
55x90x8 NBR AO / TC is a double-lip radial rotary shaft seal manufactured from nitrile rubber. It has a 55 mm inside diameter, 90 mm outside diameter and 8 mm width. The primary lip provides the main shaft sealing function, while the additional dust lip helps protect the sealing area against external contamination.
Available from simmering.pl, stock in Poland with worldwide shipping.
simmering.pl supplies radial shaft seals, oil seals, O-rings and technical sealing solutions for industry, maintenance departments, repair shops, machinery manufacturers and B2B customers worldwide.
Data sheet
You might also like
55x90x8 NBR AO / TC double-lip radial rotary shaft seal. 55 mm inside diameter, 90 mm outside diameter and 8 mm width. Manufactured from NBR nitrile rubber. AO / TC construction features a primary sealing lip and an additional dust lip that helps protect the sealing area against external contamination. GRN brand, product code US-NBR-AO-55-90-8. Available from simmering.pl, stock in Poland with worldwide shipping.
