Engine head bolts are critical fasteners used to secure the cylinder head to the engine block in marine engines. These bolts ensure proper sealing and withstand high pressure and temperature conditions. They are essential marine engine spares for maintenance and repair.

Size: M8 to M36 (varies by engine model)

Grade: 8.8, 10.9, 12.9 (common high-tensile grades)

Viscosity: Not applicable (bolts are solid components)

Buoyancy: Not applicable (non-floating component)

Material: Alloy steel (AISI 4140, 4340), stainless steel (A4-80), or titanium (marine-grade)

Thread Type: Metric coarse/fine, UNF, or specialized marine threading

Surface Treatment: Zinc plating, hot-dip galvanizing, or Dacromet coating (corrosion-resistant)

Torque Specification: 50–500 Nm (varies by size/grade)

Heat Resistance: Up to 300°C (alloy steel), higher for specialized materials

Standards: ISO 898-1, ASTM A193/A320 (marine compliance)

Head Style: Hexagonal, flange, or 12-point (engine-specific)

Yes, Engine Head Bolts and Marine Engine Spares typically comply with maritime standards such as ISO, ASTM, or specific classification society standards like DNV, ABS, or Lloyd's Register.