NLGI 2 Grease: What Is It and How to Select It?
NLGI 2 is one of the most common consistency grades in industrial greases. However, the NLGI number alone does not define the grease's base oil viscosity, load-carrying capacity, or temperature performance. For the correct selection, the consistency grade, base oil, thickener, additive package, and operating conditions should be evaluated together.
What does the NLGI class indicate?
The NLGI rating describes the relative softness or hardness of the grease. The classification ranges from 000 to 6. NLGI 2 is a medium-viscosity rating commonly used in general-purpose bearing greases. Two greases with the same NLGI rating can be completely different in terms of base oil viscosity and chemical composition.
Where is NLGI 2 used?
NLGI 2 products are encountered in electric motor bearings, fans, pumps, general machinery bearings, and numerous manual greasing applications. However, softer consistencies may be required for high speed, low temperature, central lubrication, or very narrow supply lines.
Why is base oil viscosity important?
The lubrication film formed in the bearing is primarily created by the base oil in the grease. Therefore, the base oil viscosity must be controlled according to the bearing speed, load, diameter, and operating temperature. Selecting a product solely based on the 'NLGI 2' designation is insufficient.
What information is needed to make the right choice?
The equipment manufacturer's recommendations, bearing type and size, speed, temperature, load, water or chemical contact, existing grease, and relubrication interval should all be considered together. Compatibility should also be checked before mixing different greases.
Conclusion
NLGI 2 is a very common consistency rating; however, the correct grease selection is not based solely on the NLGI rating. Base oil viscosity, thickening system, operating temperature, and application conditions must all be considered together.
For product selection, application evaluation, and technical support, you can contact GataMerk Industrial via info@gatamerk.com.
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