Propeller Boss Caps are streamlined covers fitted over the propeller hub to reduce drag and improve efficiency. They help minimize vortex-induced vibrations and enhance marine propulsion performance. These caps are commonly used in ships to optimize fuel consumption and reduce operational costs.

Size: Typically ranges from 300 mm to 1500 mm in diameter, depending on propeller size.

Grade: Commonly complies with marine standards like ISO 583, ASTM A148, or ABS/Class Society approvals.

Viscosity: Not directly applicable; hydrodynamic design reduces turbulence and drag.

Buoyancy: Neutral buoyancy to minimize impact on propeller balance and performance.

Material: High-strength cast steel, stainless steel (e.g., ASTM A743 Gr. CA6NM), or bronze alloys (e.g., CuNiAl).

Surface Finish: Smooth, polished to reduce cavitation and corrosion.

Corrosion Resistance: Coated with anti-corrosive paints or made from inherently corrosion-resistant alloys.

Installation: Bolted or welded to the propeller boss, ensuring secure fitment.

Weight: Optimized for balance, typically 5-50 kg based on size.

Operational Temperature: Suitable for -20°C to +80°C marine environments.

Propeller Boss Caps used in marine propulsion systems typically comply with international maritime standards such as those set by the International Maritime Organization (IMO) or classification societies like ABS, DNV, or Lloyd's Register. For specific compliance details, refer to the product documentation or manufacturer specifications.