What the NLGI number indicates
NLGI grade indicates grease consistency, from 000 (nearly liquid) to 6 (very stiff). Grade 2 is the most common choice for general industrial bearings, but high-speed bearings may need a softer grade and heavy-load applications a stiffer one.
How the soap base type differs
Lithium-complex soap (like MAADANOL LITH-EP) offers good thermal and water resistance and suits most general industrial applications. For wet environments or frequent washdown exposure, calcium-sulfonate soap has better water resistance.
Matching grease to operating temperature
A grease's drop point is the maximum temperature at which it retains its structure. For bearings near heat sources — like steel rolling lines — a grease with a high drop point is essential to prevent it from softening and leaking out.
Key Takeaways
- NLGI grade 2 is the most common choice for general industrial bearings
- Lithium-complex soap offers a good balance of heat and water resistance
- For hot environments, pay attention to the grease's drop point
