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Bearing Lubrication Guide — Selecting the Right Grease or Oil for Your Application
Proper lubrication is the single most important factor in achieving maximum bearing service life. Lubrication-related issues cause more bearing failures than any other category combined [1†L26-L31]. Yet lubricant selection remains widely misunderstood.
How to choose between grease and oil
The choice between grease and oil depends on your specific operating conditions.
General guidance: NLGI Grade 2 grease covers most bearing applications from -30°C to +120°C. Use Grade 1 for low-temp or high-speed applications. Switch to oil when speeds exceed grease capability or cooling is required.
NLGI consistency grades explained [7†L2-L4]:
NLGI #000 — semi-fluid: for centralized systems, gearboxes.
NLGI #00 — very soft: for centralized lubrication.
NLGI #0 — soft: for low-speed, low-temp applications.
NLGI #1 — very fluid: for low-temperature, high-speed applications [3†L21-L23].
NLGI #2 — standard: for general applications (most common choice) [3†L21-L23].
NLGI #3 — stiff: for large, slow bearings or vertical shafts.
Base oil type selection — the base oil determines the lubricant‘s fundamental operating range:
Mineral oil — adequate for general industrial applications (dirt cheap, widely available).
Synthetic oil (PAO, ester) — required for extreme temperatures (-60°C to +250°C), extended relubrication intervals.
PFPE (perfluoropolyether) — needed for aggressive chemical environments, oxygen service.
Thickener type determines grease structure and behavior:
Lithium complex — the workhorse of general-purpose lubricants (water-resistant, mechanically stable, -30°C to +150°C).
Polyurea — preferred for electric motor bearings (long life, high-temperature stability).
Calcium sulfonate — exceptional extreme-pressure and water-resistant properties (ideal for steel mills and wet environments).
Application-specific recommendations [1†L28-L30]:
| Application | Recommended lubricant | Reason |
|---|---|---|
| High-speed spindle (>10,000 RPM) | Oil or NLGI #1 synthetic | Low churning loss, heat removal |
| Electric motor bearings | Polyurea grease, NLGI #2 | Long life, high-temperature stability |
| Robot joint bearings | Low-friction grease | Consistent torque, long relubrication interval |
| Machine tool rotary table | Lithium complex grease, NLGI #2 | Good load-carrying, water resistance |
| Low-temperature application (-40°C) | NLGI #1 synthetic (PAO) | Fluidity at low temperature |
| High-temperature furnace bearing | PFPE or high-temperature synthetic | Thermal stability above 150°C |
How Ouna Bearing supports your lubrication needs
At Luoyang Ouna Bearing, all precision bearings — crossed roller bearings, ORT series rotary table bearings, and four-point contact ball slewing bearings — are manufactured to P5, P4 and P2 precision grades and initial-greased according to customer specifications. Contact us with your operating conditions (load, speed, temperature, environment), and we‘ll recommend the optimal lubricant for your specific application — including special greases for extreme conditions and custom relubrication interval calculations.
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