GRN 10x20x7 NBR AO/TC is a double-lip rotary shaft seal / oil seal. Dimensions: d = 10 mm, D = 20 mm, B = 7 mm. Material: NBR - Nitrile Butadiene Rubber. The AO/TC design combines a spring-loaded primary sealing lip with an additional dust lip that provides an extra barrier against external contamination. Selection: 10x20x7 mm + NBR + AO/TC.
Warehouse and Store: Lublin, Smoluchowskiego 1 Street, Building 4.
24h Shipping. Available from stock in Poland for delivery across the EU.
GRN 10x20x7 NBR AO/TC is a double-lip rotary shaft seal / oil seal with nominal dimensions of 10x20x7 mm. It is manufactured from NBR - Nitrile Butadiene Rubber. The AO/TC double-lip design incorporates a spring-loaded primary sealing lip and an additional auxiliary dust lip, providing an extra barrier on the external side of the primary sealing area.
Key identification data:
Brand: GRN
Product type: Rotary Shaft Seal / Radial Shaft Seal / Oil Seal
Design: AO/TC
Configuration: Double lip
Material: NBR
Material name: Nitrile Butadiene Rubber
Dimensions: 10x20x7 mm
Shaft diameter d: 10 mm
Housing bore diameter D: 20 mm
Seal width B: 7 mm
Primary sealing lip: Yes
Garter spring: Yes
Additional dust lip: Yes
The key product identification is:
GRN + 10x20x7 mm + NBR + AO/TC
All these parameters should be considered when selecting a replacement. Matching the 10 mm and 20 mm diameters alone is insufficient if the width, material or lip configuration differs.
Nominal dimensions:
d = 10 mm - nominal shaft diameter
D = 20 mm - nominal housing bore diameter
B = 7 mm - axial seal width
Complete dimensions:
10x20x7 mm
The seal is therefore specified for a nominal 10 mm shaft and 20 mm housing bore, with an axial width of 7 mm.
The 7 mm width is an important part of the product identification and should be verified when selecting a replacement.
The AO/TC designation identifies a double-lip rotary shaft seal configuration.
The sealing arrangement incorporates:
a spring-loaded primary sealing lip
and
an additional auxiliary dust lip.
The primary lip operates dynamically against the rotating shaft and performs the main sealing function.
The additional lip is positioned on the external side of the sealing arrangement and creates an additional barrier against contaminants approaching the primary sealing area.
The primary sealing lip operates directly against the rotating shaft surface.
A circumferential garter spring helps maintain the required radial contact between the sealing edge and the shaft.
Effective operation also depends on the shaft surface condition, runout, alignment, lubrication and operating environment.
The garter spring acts on the primary dynamic sealing lip, not on the auxiliary dust lip.
The AO/TC construction incorporates an additional auxiliary dust lip on the external side of the primary sealing system.
Its purpose is to provide an extra barrier between the surrounding environment and the main sealing lip.
It helps limit the ingress of dust and other external contamination into the primary sealing area.
The auxiliary lip should not be interpreted as a second spring-loaded primary sealing lip. Its main function is protective.
Seal material:
NBR - Nitrile Butadiene Rubber
NBR is widely used in rotary shaft sealing applications.
The elastomer material forms part of the complete product specification:
10x20x7 + NBR + AO/TC
A 10x20x7 seal manufactured from FKM/FPM, silicone or another elastomer represents a different material variant even if the nominal dimensions are identical.
The exact NBR compound used for this GRN seal has not been specified. Therefore, an exact hardness, fixed operating temperature range or universal chemical-resistance rating should not be assigned solely from generic NBR data.
A rotary shaft seal operates between a rotating shaft and stationary housing.
The outside diameter of the seal is installed in a nominal 20 mm housing bore.
The primary sealing lip operates dynamically against a nominal 10 mm shaft.
In the AO/TC configuration, the auxiliary lip provides an additional external barrier around the main sealing area.
Seal performance depends on the complete application, including shaft surface quality, alignment, runout, rotational speed, temperature, lubrication, sealed medium and installation quality.
These two seals share the same nominal shaft and outside diameters but have different axial widths:
10x20x7: B = 7 mm
10x20x5: B = 5 mm
They should therefore not be considered automatically interchangeable.
The difference in axial width can affect installation depth and the position at which the sealing lip operates on the shaft.
The complete third dimension should always be retained when identifying the seal.
The main difference is the lip configuration.
A/SC - single-lip design
Spring-loaded primary sealing lip without an additional dust lip.
AO/TC - double-lip design
Spring-loaded primary sealing lip plus an additional auxiliary dust lip.
Therefore:
10x20x7 NBR A/SC ≠ 10x20x7 NBR AO/TC
even though the nominal envelope dimensions can be identical.
When selecting a replacement for GRN 10x20x7 NBR AO/TC, verify:
d = 10 mm
D = 20 mm
B = 7 mm
NBR material
AO/TC double-lip design
spring-loaded primary sealing lip
additional dust lip
sealed medium
operating temperature
shaft rotational speed
pressure conditions
shaft surface condition
installation depth and geometry
A seal identified only as 10x20 is insufficient for precise selection. The complete 7 mm width must also be verified.
Brand: GRN
Product: Rotary Shaft Seal / Radial Shaft Seal / Oil Seal
Design: AO/TC
Configuration: Double lip
Material: NBR
Material name: Nitrile Butadiene Rubber
Shaft diameter d: 10 mm
Outside diameter D: 20 mm
Width B: 7 mm
Dimensions: 10x20x7 mm
Primary sealing lip: Yes
Garter spring: Yes
Additional dust lip: Yes
Exact NBR compound: Not specified
NBR hardness: Not confirmed
Exact operating temperature range: Not confirmed for this GRN compound
Maximum shaft speed: Application-dependent
Maximum pressure: Application-dependent
Warehouse and Store: Lublin, Smoluchowskiego 1 Street, Building 4.
24h Shipping. Available from stock in Poland for delivery across the EU.
The nominal dimensions are 10x20x7 mm: d = 10 mm, D = 20 mm and B = 7 mm.
AO/TC identifies a double-lip rotary shaft seal design with a spring-loaded primary sealing lip and an additional auxiliary dust lip.
It is manufactured from NBR - Nitrile Butadiene Rubber.
Yes. A garter spring acts on the primary sealing lip to help maintain contact with the rotating shaft.
Yes. The AO/TC design incorporates an additional auxiliary dust lip on the external side.
No. They have the same 10 mm shaft and 20 mm outside diameters but different widths: 7 mm versus 5 mm.
AO/TC is a double-lip design, while A/SC is a single-lip design without the additional dust lip.
No. The dimensions, elastomer material, lip configuration and application requirements must all be checked.
No. The garter spring acts on the primary dynamic sealing lip. The additional lip primarily performs a protective function.
Not without knowing the exact NBR compound used by GRN. Generic NBR temperature ranges should not be presented as guaranteed operating limits for this specific product.
Yes. It affects the axial installation geometry and can change the position of the sealing lip on the shaft. A 10x20x5 seal should therefore not automatically replace a 10x20x7 seal.
No. The general lip configuration may be similar, but exact geometry, elastomer compound, spring characteristics and other design details can differ.
It is the nominal shaft diameter d against which the primary sealing lip operates.
GRN 10x20x7 NBR AO/TC is a double-lip rotary shaft seal with nominal dimensions of 10x20x7 mm. Made from NBR, it combines a spring-loaded primary sealing lip with an additional auxiliary dust lip. Replacement selection should retain the complete 10x20x7 mm + NBR + AO/TC specification, including the 7 mm axial width.
Data sheet
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GRN 10x20x7 NBR AO/TC is a double-lip rotary shaft seal / oil seal. Dimensions: d = 10 mm, D = 20 mm, B = 7 mm. Material: NBR - Nitrile Butadiene Rubber. The AO/TC design combines a spring-loaded primary sealing lip with an additional dust lip that provides an extra barrier against external contamination. Selection: 10x20x7 mm + NBR + AO/TC.
Warehouse and Store: Lublin, Smoluchowskiego 1 Street, Building 4.
24h Shipping. Available from stock in Poland for delivery across the EU.
