Marine Double Bollard, also known as Double Bitt Boat Bollard.
GBT 554-2008 specifies the requirements for Type C marine double bollards, which consist of two cylindrical horns mounted on a common base plate to secure larger vessels to docks with higher load-bearing capacity.
Constructed from cast steel or ductile iron, these bollards must withstand a minimum breaking load of 100 tons, rotate freely on their base, and prevent damage to mooring lines.
The series includes five variants: Type A (ordinary), Type B (embedded), Type C (simple), Type DL (double cross screw-fixed), and Type DH (double cross weld-fixed), each with different nominal diameters.
All bollards comply with the national standard and carry China Classification Society certification, with customized solutions available upon request.