GRN 12x37x7 NBR AO/TC is a double lip radial shaft oil seal with a 12 mm inner diameter, 37 mm outer diameter and 7 mm width. Manufactured from NBR elastomer resistant to many mineral oils and greases. Features an AO/TC profile with a primary sealing lip and an additional dust exclusion lip. Designed to reduce lubricant leakage and contamination ingress in appropriately selected gearboxes, gear reducers and industrial machinery. Available from simmering.pl, Lublin, Poland, with EU and international shipping.
GRN 12x37x7 NBR AO/TC is a double lip radial shaft oil seal (Simmerring) with an inner diameter of 12 mm, an outer diameter of 37 mm and an axial width of 7 mm. Manufactured from nitrile butadiene rubber (NBR), it features an AO/TC sealing profile with a primary sealing lip and an additional dust exclusion lip. The seal is designed to reduce oil and grease leakage while limiting contamination ingress into rotating mechanical assemblies.
The GRN 12x37x7 NBR AO/TC oil seal is intended for a shaft with a nominal diameter of 12 mm and a housing bore with a nominal diameter of 37 mm.
Its axial width is 7 mm, while its nominal radial cross-section height is 12.5 mm.
The double lip construction combines lubricant retention with additional protection against dust, dirt and fine contaminants.
The TC profile is a widely used designation for a double lip radial shaft oil seal, typically featuring a rubber-covered outer diameter, internal metal reinforcement and a spring-loaded primary sealing lip.
However, the exact construction of this specific GRN product should be confirmed in the manufacturer's technical documentation.
|
Parameter |
Specification |
|---|---|
|
Brand |
GRN |
|
Product type |
Radial shaft oil seal |
|
Alternative name |
Simmerring |
|
Sealing profile |
AO / TC |
|
Construction |
Double lip |
|
Material |
NBR - Nitrile Butadiene Rubber |
|
Inner diameter d |
12 mm |
|
Outer diameter D |
37 mm |
|
Width b |
7 mm |
|
Nominal dimensions |
12x37x7 mm |
|
Primary lip |
Sealing lip |
|
Additional lip |
Dust exclusion lip |
|
Garter spring |
Typical of TC profiles; requires confirmation |
|
Outer surface |
Typically rubber-covered |
|
Internal reinforcement |
Typically metal |
|
Motion type |
Rotary |
|
Primary function |
Reducing oil and grease leakage |
|
Additional function |
Limiting contamination ingress |
|
NBR hardness |
Not confirmed |
|
Operating temperature |
Depends on NBR compound and operating conditions |
|
Permissible shaft surface speed |
Not confirmed |
|
Permissible pressure |
Not confirmed |
|
Directional design |
Not confirmed |
|
OEM references / EAN |
Not confirmed |
Technical note: AO and TC designations may describe similar double lip constructions, but they should not automatically be considered equivalent across all manufacturers.
|
Symbol |
Value |
Description |
|---|---|---|
|
d |
12 mm |
Nominal shaft diameter |
|
D |
37 mm |
Nominal housing bore diameter |
|
b |
7 mm |
Axial seal width |
|
D - d |
25 mm |
Difference between outer and inner diameters |
|
(D - d) / 2 |
12.5 mm |
Nominal radial cross-section height |
The designation 12x37x7 mm identifies the essential installation dimensions:
Shaft diameter: 12 mm.
Housing bore diameter: 37 mm.
Seal width: 7 mm.
Correct selection also requires verification of installation tolerances, shaft surface quality and the construction of the original sealing component.
GRN is a brand of technical sealing products used in mechanical and industrial equipment, including radial shaft oil seals and O-rings.
12 mm - inner diameter.
37 mm - outer diameter.
7 mm - axial width.
NBR is a synthetic elastomer commonly used in seals exposed to many mineral oils and lubricating greases.
AO identifies a construction with a primary sealing lip and an additional dust exclusion lip.
TC is a common designation for a double lip radial shaft oil seal, typically featuring a rubber-covered outer diameter and a spring-loaded primary sealing lip.
AO and TC may describe similar sealing arrangements, but complete equivalence should not be assumed without verification.
The primary sealing lip operates against the rotating shaft and is responsible for reducing lubricant leakage.
Sealing performance depends on shaft surface condition, lip geometry, lubrication and operating conditions.
The secondary lip provides an additional barrier against dust and fine contaminants entering the primary sealing area.
This does not guarantee complete protection against pressurized water or extreme contamination.
In typical TC constructions, the primary sealing lip is supported by a garter spring that helps maintain contact with the shaft surface.
The exact configuration of the GRN 12x37x7 oil seal requires confirmation.
Typical TC constructions incorporate a metal reinforcing element that supports the seal body and helps maintain its geometry.
In a typical TC profile, the outer surface is covered with elastomer to help provide static sealing between the seal body and housing bore.
NBR is widely used in seals operating with many mineral oils and industrial lubricating greases.
Nitrile rubber provides the elastic properties required for a sealing lip to operate against a rotating shaft surface.
Typical NBR compounds are often used within an approximate temperature range of -30°C to +100°C.
This is not a verified temperature range for the specific GRN 12x37x7 product. Actual permissible values depend on the elastomer compound, lubricant, shaft speed and operating conditions.
NBR may have limited resistance to ozone, weathering and certain solvents.
For applications requiring higher temperature resistance or specific chemical compatibility, an appropriately selected FPM/FKM oil seal may be considered.
|
Feature |
AO/TC Double Lip |
A/BA Single Lip |
|---|---|---|
|
Primary sealing lip |
Yes |
Yes |
|
Additional dust exclusion lip |
Yes |
No |
|
Garter spring |
Typically yes |
Typically yes |
|
Oil and grease sealing |
Yes |
Yes |
|
Dust protection |
Additional barrier |
No additional lip |
|
Interchangeability |
Requires verification |
Requires verification |
The AO/TC profile may be advantageous in applications where limiting contamination ingress is important in addition to retaining lubricant.
Nominal dimensions of 12x37x7 mm.
Double lip AO/TC sealing profile.
NBR elastomer material.
Primary sealing lip.
Additional dust exclusion lip.
Garter spring typical of TC construction.
Typically rubber-covered outer diameter.
Typically internal metal reinforcement.
Nominal radial cross-section height of 12.5 mm.
Axial width of 7 mm.
Designed for rotating shaft sealing.
Helps reduce oil and grease leakage.
Provides additional protection against fine contaminants.
Radial shaft oil seals may be used in gearboxes requiring oil retention within the housing.
Double lip oil seals can help reduce lubricant loss and limit contamination ingress into mechanical assemblies.
This type of seal may be used in appropriately designed rotating assemblies of industrial equipment.
The AO/TC profile may be used in mechanisms requiring additional protection against dust.
In selected mechanical constructions, radial shaft oil seals operate alongside bearing housings to reduce oil or grease leakage.
These are general application examples and do not establish verified compatibility with specific OEM equipment.
Before purchasing, verify:
Shaft diameter - 12 mm.
Housing bore diameter - 37 mm.
Axial width - 7 mm.
Double lip AO/TC profile.
NBR elastomer material.
Type of oil or grease.
Operating temperature.
Shaft rotational and surface speed.
Environmental dust exposure.
Shaft surface condition and roughness.
Pressure and construction requirements.
Shaft surface speed depends on both shaft diameter and rotational speed.
Matching the dimensions 12x37x7 mm does not guarantee complete interchangeability between oil seals.
When selecting a replacement, confirm:
Inner diameter of 12 mm.
Outer diameter of 37 mm.
Width of 7 mm.
Double lip construction.
Elastomer material.
Outer surface design.
Presence of a garter spring.
Operating conditions.
A single lip A/BA oil seal with identical dimensions may not always be a suitable replacement for the AO/TC version.
Inspect the shaft surface for scratches, corrosion, burrs and wear.
The housing bore should be clean, undamaged and manufactured to the required tolerances.
Press the oil seal evenly into the housing using an appropriate installation tool.
Avoid direct impact on the sealing lips or deformation of the seal body.
In typical applications, the primary sealing lip should face the oil or grease being retained, while the dust exclusion lip faces the external environment.
However, the equipment manufacturer's installation instructions must always be followed.
Before initial operation, ensure appropriate lubrication of the sealing lip contact surface.
For double lip constructions, the lubrication requirements of the space between the lips should also be considered.
Misalignment of the seal body may cause leakage.
Scratches and surface irregularities can accelerate sealing lip wear.
Insufficient lubrication increases friction and operating temperature.
Exposure to an operating medium incompatible with NBR may cause elastomer degradation.
Excessive temperature, speed or pressure may reduce sealing performance and service life.
1. What is the GRN 12x37x7 NBR AO/TC oil seal?
It is a double lip radial shaft oil seal manufactured from NBR, with nominal dimensions of 12x37x7 mm.
2. What are the dimensions of the seal?
The inner diameter is 12 mm, the outer diameter is 37 mm and the axial width is 7 mm.
3. What does AO/TC mean?
AO/TC identifies a double lip construction featuring a primary sealing lip and an additional dust exclusion lip.
4. Is the oil seal double lip?
Yes. The AO/TC profile incorporates a primary sealing lip and an additional dust exclusion lip.
5. Does the oil seal have a garter spring?
A garter spring is typical of TC constructions, but its presence in this specific product requires confirmation.
6. What does NBR mean?
NBR stands for Nitrile Butadiene Rubber, a material commonly used in seals exposed to many mineral oils and lubricating greases.
7. Is this oil seal suitable for small gearboxes?
It may be suitable for appropriately designed gearboxes if its dimensions and operating characteristics meet the equipment requirements.
8. Is NBR resistant to oil?
Yes. NBR provides good resistance to many mineral oils and industrial lubricating greases.
9. Can a replacement from another brand be used?
Yes, provided that dimensional, sealing profile, material and operating compatibility are confirmed.
10. Can an AO/TC oil seal be replaced with a single lip version?
Such interchangeability should not be assumed without verifying the equipment requirements, because the AO/TC profile incorporates an additional dust exclusion lip.
11. How should a 12x37x7 oil seal be installed?
Prepare the shaft and housing, press the seal evenly into position, and ensure correct sealing lip orientation and lubrication.
12. Where can I buy the GRN 12x37x7 NBR AO/TC oil seal?
The product is offered by simmering.pl, an industrial sealing components and bearings supplier with a warehouse in Lublin, Poland, serving customers throughout Poland, the European Union and international markets.
GRN 12x37x7 NBR AO/TC is a double lip radial shaft oil seal with a 12 mm inner diameter, 37 mm outer diameter and 7 mm width. Manufactured from nitrile butadiene rubber, it features a primary sealing lip and an additional dust exclusion lip. The seal helps reduce oil and grease leakage while protecting rotating mechanical assemblies against contamination.
GRN 12x37x7 NBR AO/TC is offered by simmering.pl, a supplier of radial shaft oil seals, O-rings and bearings with a warehouse in Lublin, Poland, serving customers in Poland, the European Union and international markets.
Data sheet
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GRN 12x37x7 NBR AO/TC is a double lip radial shaft oil seal with a 12 mm inner diameter, 37 mm outer diameter and 7 mm width. Manufactured from NBR elastomer resistant to many mineral oils and greases. Features an AO/TC profile with a primary sealing lip and an additional dust exclusion lip. Designed to reduce lubricant leakage and contamination ingress in appropriately selected gearboxes, gear reducers and industrial machinery. Available from simmering.pl, Lublin, Poland, with EU and international shipping.
