57mm aluminum Flip-Flop block Harken

Harken’s 57mm aluminum Flip-Flop block are a must-have for any sailor looking for optimum line routing of up to 10mm in diameter on their yacht. Their lightweight, robust design makes them a reliable solution for halyard, mainsheet and spinnaker sheet leads, ensuring smooth, efficient manoeuvring.

Made from hard-anodised aluminium and treated with PTFE, these blocks offer increased resistance to wear and electrolytic corrosion, a major advantage in demanding marine environments. Their pivoting design keeps the rope as close to the deck as possible, reducing friction and improving load transmission.

The hinge of the attachment allows precise adjustment of the orientation, offering maximum flexibility in installation. For added control, the lock-off version is equipped with a lock-off wedge, allowing the rope to be temporarily locked, freeing a winch if required.

With a maximum working load of 1136 kg and a breaking load of 2273 kg, these blocks are designed to withstand high stresses. All while ensuring smooth, safe operation. Available with or without blocking, they are perfectly suited to the needs of demanding yachtsmen and racers.

Technical specifications Harken 57mm aluminum Flip-Flop block :

• Sheave diameter : 57 mm
• Sheave length : 111 mm
• Width : 57 mm
• Height : 73 mm
• Weight : 255 g
• Maximum rope diameter : 10 mm
• Screws : 6 SH mm
• Maximum working load : 1136 kg
• Breaking load : 2273 kg
• Specific dimensions : A = 93.6 mm, B = 39.7 mm
• Material : Hard anodised aluminium with PTFE treatment
• Articulated mounting : Adjustment of orientation for optimum rope alignment
• Pivoting around the rope axis : Reduced friction and improved load transmission
• Available in two versions : With or without lock-off. Ideal for freeing a winch.