Improper bearing grease selection can easily cause abnormal equipment noise, excessive temperature rise, premature failure, and other problems. FUCHS bearing lubrication solutions cover every precision sub-application, providing equipment maintenance and process engineers with precisely matched lubrication products — safeguarding long-lasting, efficient equipment operation with professional lubrication solutions.

I. Four Core Criteria for Bearing Grease Selection

Bearing lubrication requires cross-referencing the following four indicators for selection — no single parameter can guarantee long-term stable equipment operation.

1. Speed Factor (n×dm value — the primary criterion for precision bearings)

The speed factor directly defines a bearing's limiting operating conditions; high-speed and ultra-high-speed precision spindles must match this indicator first:

• Ultra-high speed (n×dm ≥ 1.8 million): machine tool spindles, textile spindles, high-speed servo motors — matched with low-viscosity ester / synthetic hydrocarbon base oils and special lithium soap greases to effectively suppress temperature rise at high speeds

• Medium-high speed (1.0 million ≤ n×dm < 1.8 million): blowers, cooling fans, high-speed rolling bearings — matched with polyurea-based products, shear-resistant and long-lasting

• Medium-low speed (300,000 ≤ n×dm < 1.0 million): conveyor rollers, small and medium-sized precision motors

• Low speed (n×dm < 300,000): heavy-duty metallurgical and mining equipment — choose high-viscosity base oil extreme-pressure formulation greases

2. Operating Temperature Range

Temperature determines the base oil oxidation rate and the grease's low-temperature flowability; precision equipment must balance long-term stability at both high and low temperatures:

• Ultra-low temperature (-60 to -90 °C): cold chain production lines, cryogenic laboratories, outdoor precision instruments — matched with PFPE (perfluoropolyether) greases for low starting torque and unimpeded low-temperature operation

• Conventional wide range (-40 to 160 °C): the vast majority of precision motors and drive bearings — generally covered by lithium soap or polyurea synthetic greases

• High temperature (180 to 260 °C): heat treatment equipment, high-temperature ovens, high-temperature clutches — matched with PFPE greases that run long-term at high temperatures without carbon build-up or hardening

• Wide-temperature vacuum (-65 to 260 °C): semiconductor and aerospace clean chambers — choose low-volatility specialty fluorinated greases suited to harsh vacuum environments

3. Load Rating

Lightly loaded precision bearings emphasize low noise and low friction; shock and heavy-load conditions must be equipped with extreme-pressure anti-wear additives to strengthen oil film load-carrying capacity:

• Light-load precision: machine tool spindles, optical inspection equipment, small precision lead screws — require custom quiet, low-friction formulations

• Medium-load continuous operation: general rolling bearings, automated conveying equipment

• Low-speed heavy load / shock load: construction machinery, mine rolling mills, vehicle wheel hub bearings — matched with high-viscosity extreme-pressure greases to resist raceway pitting wear

4. Special Operating Environments

The media in the equipment's operating environment directly determine base oil and thickener selection. Ordinary greases must never be mixed into special-duty applications, which fall into sub-scenarios such as waterproof/moisture-proof, electrically conductive/insulating, food contact, vacuum cleanroom, medical sterile, and highly corrosive environments — each requiring a dedicated formulation.

II. FUCHS Bearing Grease Recommendations by Application

1. Ultra-High-Speed Precision Bearings: Machine Tool Spindles, Textile Spindles, High-Speed Motors

This application is characterized by high speed, low temperature rise, and low noise. Recommended products:

• TURMOGREASE Highspeed L 182: speed factor up to 2.5 million, operating temperature -70 to 120 ℃, purpose-made for ultra-high-speed machine tool spindles, smooth low-temperature start-up without sticking

• TURMOGREASE Highspeed L 252: speed factor up to 2.2 million, excellent water resistance, suited to textile spindles

• TURMOGREASE LC 252: lithium-calcium mixed soap, resistant to cutting fluids — the preferred choice for spindles in wet machining

• RENOLIT LI LNB PLUS 2: speed factor up to 2 million, quiet and vibration-damping, suited to elevators and precision water pumps

2. Precision Bearings for Extreme High and Low Temperatures

• Low-Temperature, Low-Torque (Cold Chain, Cryogenic Testing)

  RENOLIT WTF 2: withstands low temperatures down to -60 °C, suited to cold chain roller conveyors

  UNIFLOR 8951: operating temperature down to -90 ℃, purpose-made for aviation and laboratory equipment, resistant to chemical corrosion

• High-Temperature Precision Bearings (High-Temperature Blowers, Heat Treatment Equipment)

  THERMOPLEX LME 552: operating temperature up to 200 ℃, suited to high-temperature, high-speed rolling bearings. TURMOTEMP LP 5002: PFPE formulation, runs stably under high-temperature, heavy-load conditions at up to 250 ℃.

3. Low-Speed Heavy-Load / Wheel Hub Precision Bearings: Construction Machinery, Mining, Commercial Vehicles

The core needs of this application are extreme-pressure shock resistance and long-lasting high-temperature protection. Recommended products:

• TURMOGREASE L 802 EP plus: suited to heavy-duty metallurgical drive bearings

• RENOLIT LX-FCH: lithium complex grease, operating temperature 160 to 200 ℃, purpose-made for truck and construction machinery wheel hub units

• TURMOTEMP N 5002: withstands high temperatures up to 260 °C, suited to high-temperature, low-speed, heavy-duty equipment

4. Special Precision Sub-Applications

• Conductive Bearings (Slip Rings, Conductive Rotating Mechanisms)

TURMOGREASE N 503 B ELC conductive grease has a speed factor up to 1.3 million, delivering integrated conductivity and lubrication even at 180 ℃.

• Food-Grade Bearings (Baking, Filling, Pharmaceuticals)

CASSIDA aluminum complex greases comply with food contact standards:

CASSIDA GREASE EPS 2: for medium-high-speed equipment at -35 to 140 ℃.

CASSIDA GREASE HTS 2: operating temperature up to 200 ℃, suited to high-temperature baking lines

• Vacuum / Semiconductor Bearings (Cleanrooms, Vacuum Chambers)

NYETORR 5300 (-65 to 250 ℃), ULTRATHERM 2000 (up to 260 ℃), low-volatility PFPE formulations, suited to semiconductor and aerospace precision components

• Medical Precision Instrument Bearings

NYEMED^® 7471: PFPE formulation, operating temperature -70 to 250 °C, suited to plastic-metal composite structures

NYEMED^® 7325: silicone-oil-based with a UV tracer, purpose-made for small medical drives

• Linear Motion Lead Screw Bearings

GLEITMO 585 K: suited to recirculating ball T-profile lead screws

TURMOGREASE L 251 ARO: suited to high-speed planetary roller screws, smooth low-temperature operation