Stern Tube Bearing Oil is a specialized marine lubricant designed for stern tube bearings in ships. It provides excellent lubrication, reduces friction, and protects against wear in harsh marine environments. This oil ensures smooth operation and longevity of stern tube bearings under heavy loads and varying temperatures.

Stern Tube Bearing Oil Key Specifications:

- Size: Typically supplied in bulk, drums (205L), or smaller containers (20L).

- Grade: Commonly SAE 30, SAE 40, or ISO VG 68 to VG 220.

- Viscosity: 60-220 cSt at 40°C, depending on application.

- Buoyancy: Not applicable (non-buoyant, designed for lubrication).

- Material: Mineral or synthetic base oils with anti-wear (AW) and extreme pressure (EP) additives.

- Flash Point: Minimum 200°C for safety.

- Pour Point: Below -15°C to ensure low-temperature performance.

- Density: ~0.88-0.92 g/cm³ at 15°C.

- Water Content: <0.1% to prevent corrosion.

- Compatibility: Suitable for white metal bearings (e.g., Babbitt).

- Certifications: Often meets OEM specs (e.g., MAN, Wärtsilä) and ISO 6743-4.

Stern Tube Bearing Oil and Marine Lubricants typically comply with maritime standards such as ISO 8217, ISO 6743-4, and OEM specifications from manufacturers like MAN Energy Solutions and Wärtsilä.