GRN® 30x50x7 NBR A is a single lip radial shaft oil seal with nominal dimensions of 30x50x7 mm. Inner diameter 30 mm, outer diameter 50 mm and axial width 7 mm. Manufactured from nitrile butadiene rubber (NBR), resistant to many mineral oils and lubricating greases. The A profile features one primary sealing lip without an additional dust exclusion lip. Nominal radial cross-section height 10 mm. Designed to reduce oil and grease leakage from rotating mechanical assemblies. Available from simmering.pl, with a warehouse in Lublin, Poland, and shipping across Poland and the EU.
GRN® 30x50x7 NBR A is a single lip radial shaft oil seal (Simmerring) with nominal dimensions of 30x50x7 mm, manufactured from nitrile butadiene rubber (NBR). The A profile features one primary sealing lip without an additional dust exclusion lip. The seal is designed for installation on a shaft with a nominal diameter of 30 mm and in a housing bore with a nominal diameter of 50 mm.
The primary function of the GRN® 30x50x7 oil seal is to reduce oil or grease leakage at the point where a rotating shaft passes through a mechanical housing.
Its single lip construction is suitable for applications where lubricant retention is required and an additional dust exclusion lip is not specified by the equipment design.
The nominal radial cross-section height is 10 mm.
The GRN® 30x50x7 NBR A oil seal may be considered as a replacement component during equipment maintenance or repair, provided that its dimensions, sealing profile, material and operating conditions are compatible.
|
Parameter |
Specification |
|---|---|
|
Brand |
GRN® |
|
Product designation |
30x50x7 NBR A |
|
Product type |
Radial shaft oil seal |
|
Alternative name |
Simmerring |
|
Sealing profile |
A |
|
Construction |
Single lip |
|
Elastomer material |
NBR |
|
Material name |
Nitrile Butadiene Rubber |
|
Inner diameter d |
30 mm |
|
Outer diameter D |
50 mm |
|
Width b |
7 mm |
|
Nominal dimensions |
30x50x7 mm |
|
Primary sealing lip |
Yes |
|
Additional dust exclusion lip |
No |
|
Nominal radial cross-section |
10 mm |
|
Motion type |
Rotary |
|
Primary function |
Reducing oil and grease leakage |
Technical note: The A profile in the supplied product designation identifies a single lip construction. The detailed body design, spring type, elastomer hardness, permissible operating temperature, pressure and shaft surface speed require confirmation from the manufacturer's documentation for this specific product.
|
Symbol |
Value |
Description |
|---|---|---|
|
d |
30 mm |
Nominal shaft diameter |
|
D |
50 mm |
Nominal housing bore diameter |
|
b |
7 mm |
Axial width |
|
D - d |
20 mm |
Difference between outer and inner diameters |
|
(D - d) / 2 |
10 mm |
Nominal radial cross-section height |
The designation 30x50x7 mm is interpreted as follows:
30 mm - inner diameter, corresponding to the nominal shaft diameter.
50 mm - outer diameter, corresponding to the nominal housing bore diameter.
7 mm - axial width of the oil seal.
The nominal radial cross-section height is 10 mm.
This is a geometric value calculated from the difference between the outer and inner diameters. It does not represent the thickness of the rubber layer.
When selecting the oil seal, shaft and housing tolerances and the equipment's design requirements must also be considered.
GRN® is a brand of technical sealing components offered for industrial, maintenance and repair applications.
GRN® products are available from simmering.pl, a specialist supplier of radial shaft oil seals, O-rings and bearings.
The numbers identify:
Shaft diameter: 30 mm.
Housing bore diameter: 50 mm.
Oil seal width: 7 mm.
NBR is a synthetic elastomer commonly used in seals operating with many mineral oils and lubricating greases.
The A profile identifies a construction with one primary sealing lip.
Unlike a double lip TC design, the A profile does not feature an additional dust exclusion lip.
Similar single lip constructions may be identified by different profile designations in other manufacturers' catalogues. However, their complete interchangeability must be verified.
The primary sealing lip is the main component responsible for dynamic sealing against the rotating shaft surface.
During operation, it helps reduce lubricant leakage from the mechanical assembly.
Sealing performance depends on:
Shaft surface condition.
Sealing lip geometry.
Elastomer material.
Shaft surface speed.
Operating temperature.
Lubrication conditions.
Shaft and housing alignment.
The GRN® 30x50x7 NBR A oil seal has a single lip construction.
It does not include an additional lip specifically designed to limit contamination ingress from the external environment.
Therefore, equipment operating in heavily contaminated environments may require additional protection specified by the equipment manufacturer.
A single lip oil seal should not automatically be replaced with a double lip version without checking operating conditions and available installation space.
Typical single lip radial shaft oil seals use a garter spring to help maintain contact between the sealing lip and the shaft.
The exact spring construction of the GRN® 30x50x7 NBR A oil seal requires confirmation from the manufacturer's documentation.
Typical A-profile radial shaft oil seals feature a reinforcing element within the body and a rubber-covered outer diameter.
The body helps maintain the oil seal's geometry and position within the housing bore.
The detailed construction of this specific product should be confirmed using manufacturer data.
Nitrile Butadiene Rubber is one of the most commonly used elastomer materials in radial shaft oil seals.
Its characteristic properties include:
Good resistance to many mineral oils.
Compatibility with numerous mineral oil-based lubricating greases.
Elasticity required for dynamic shaft sealing.
Suitability for appropriately designed mechanical systems.
NBR chemical resistance depends on the elastomer compound, temperature and operating medium.
Compatibility with all synthetic oils, fuels, solvents or aggressive chemicals should not be assumed.
The exact permissible operating temperature range for this GRN® oil seal requires confirmation from the manufacturer.
|
Feature |
A Profile |
TC Profile |
|---|---|---|
|
Primary sealing lip |
Yes |
Yes |
|
Additional dust exclusion lip |
No |
Yes |
|
Oil leakage reduction |
Yes |
Yes |
|
Grease leakage reduction |
Yes |
Yes |
|
Additional dust barrier |
No |
Yes |
|
Automatic interchangeability |
No |
No |
A single lip construction may be suitable for equipment where additional dust protection is not required.
A double lip profile may be beneficial in environments exposed to contamination.
The choice should be based on the equipment's requirements rather than solely on the number of sealing lips.
|
Parameter |
30x50x7 mm |
30x50x8 mm |
30x52x7 mm |
|---|---|---|---|
|
Inner diameter |
30 mm |
30 mm |
30 mm |
|
Outer diameter |
50 mm |
50 mm |
52 mm |
|
Width |
7 mm |
8 mm |
7 mm |
|
Radial cross-section height |
10 mm |
10 mm |
11 mm |
|
Direct dimensional interchangeability |
Reference product |
Not confirmed |
No |
These dimensions are provided for geometric comparison only.
Both oil seals have the same inner and outer diameters.
However, their axial widths differ by 1 mm.
The possibility of installing the wider oil seal depends on the available installation space, sealing lip position and equipment design.
Automatic interchangeability should not be assumed.
Both variants have an inner diameter of 30 mm and an axial width of 7 mm.
However, their outer diameters differ by 2 mm.
They are not directly dimensionally interchangeable.
The product may be searched for using the following designations:
GRN® 30x50x7 NBR A
GRN® 30x50x7 Simmerring
GRN® 30x50x7 radial shaft oil seal
30x50x7 single lip oil seal
30x50x7 NBR shaft seal
GRN® 30x50x7 oil seal
30x50x7 NBR rotary shaft seal
No unverified OEM references or catalogue numbers from other manufacturers have been assigned.
Before purchasing, verify the following:
Shaft diameter: nominally 30 mm.
Housing bore diameter: nominally 50 mm.
Axial width: 7 mm.
Sealing profile: single lip A.
Elastomer material: NBR compatible with the operating medium.
Shaft surface condition: absence of damage that could compromise sealing.
Rotational speed: compatibility with permissible oil seal operating conditions.
Operating temperature: actual conditions at the sealing interface.
Pressure: compatibility with the oil seal construction.
Environmental conditions: presence of dust, moisture and other contaminants.
Installation conditions: correct alignment and positioning within the housing bore.
Shaft surface speed can be calculated using the following formula:
Where:
v - shaft surface speed in m/s.
d - shaft diameter in mm.
n - rotational speed in rpm.
For a shaft diameter of 30 mm:
|
Rotational speed |
Calculated shaft surface speed |
|---|---|
|
500 rpm |
0.79 m/s |
|
1000 rpm |
1.57 m/s |
|
1500 rpm |
2.36 m/s |
|
3000 rpm |
4.71 m/s |
|
5000 rpm |
7.85 m/s |
The values above are based solely on geometric calculations.
They do not represent verified permissible operating speeds for the GRN® 30x50x7 NBR A oil seal.
Oil seal selection requires consideration of lubrication conditions, operating temperature and manufacturer-specified limits.
Single lip radial shaft oil seals are used in appropriately designed mechanical assemblies where lubricant retention is required.
Typical application categories include:
Mechanical gearboxes.
Bearing housings.
Drive systems and rotating assemblies.
Industrial machinery.
Equipment with rotating shafts.
These are general applications of single lip radial shaft seals, not verified OEM applications of the specific GRN® 30x50x7 product.
Final suitability depends on equipment design and operating conditions.
Before installation, thoroughly clean the shaft and housing bore.
The shaft surface should be free from scratches, burrs, corrosion and wear grooves that could affect sealing performance.
Install the oil seal evenly using an appropriate installation tool.
Installation force must not be applied directly through the sealing lip.
In typical applications, the primary sealing lip should face the retained lubricant.
Final installation orientation must comply with the equipment's requirements.
Before starting the equipment, ensure proper lubrication of the sealing lip contact area.
Store the oil seal in a clean, dry environment protected from sunlight, ozone and deformation.
1. What are the dimensions of the GRN® 30x50x7 NBR A oil seal?
The inner diameter is 30 mm, the outer diameter is 50 mm and the axial width is 7 mm. The nominal radial cross-section height is 10 mm.
2. What does the A profile mean in a 30x50x7 oil seal?
The A profile identifies a single lip construction with one primary sealing lip and no additional dust exclusion lip.
3. Is the GRN® 30x50x7 a single lip oil seal?
Yes. The A designation identifies a single lip construction.
4. Is an NBR oil seal suitable for oil?
NBR offers good resistance to many mineral oils and lubricating greases. Compatibility with the specific operating medium should be verified.
5. Can a 30x50x8 oil seal replace a 30x50x7 oil seal?
Automatic interchangeability should not be assumed. The products differ in axial width by 1 mm, which may affect installation and sealing lip position.
6. Is a 30x52x7 oil seal interchangeable with a 30x50x7 oil seal?
No. Their outer diameters differ by 2 mm.
7. Can an oil seal from another manufacturer with dimensions of 30x50x7 be used?
It may be suitable if the dimensions, sealing profile, material, construction and permissible operating conditions are compatible.
8. How should the GRN® 30x50x7 NBR A oil seal be installed?
Clean the shaft and housing, inspect the surfaces, install the seal evenly, and ensure correct sealing lip orientation and lubrication.
GRN® 30x50x7 NBR A is a single lip radial shaft oil seal with nominal dimensions of 30x50x7 mm, manufactured from nitrile butadiene rubber. The A profile features one primary sealing lip without an additional dust exclusion lip. Its nominal radial cross-section height is 10 mm. The seal helps reduce oil and grease leakage from rotating mechanical assemblies.
The GRN® 30x50x7 NBR A oil seal is offered by simmering.pl, a specialist supplier of industrial sealing components, O-rings and bearings. GRN® products have been offered by TG Ersatzteile Polska since 2007. The company operates a warehouse in Lublin, Poland, and serves customers in Poland and international markets.
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GRN® 30x50x7 NBR A is a single lip radial shaft oil seal with nominal dimensions of 30x50x7 mm. Inner diameter 30 mm, outer diameter 50 mm and axial width 7 mm. Manufactured from nitrile butadiene rubber (NBR), resistant to many mineral oils and lubricating greases. The A profile features one primary sealing lip without an additional dust exclusion lip. Nominal radial cross-section height 10 mm. Designed to reduce oil and grease leakage from rotating mechanical assemblies. Available from simmering.pl, with a warehouse in Lublin, Poland, and shipping across Poland and the EU.
