Harken 3405 1 Ton Twing Block with Spring-Loaded Side Opening

The Harken 3405 is a precision-engineered 1-ton twing block designed for easy one-handed rigging, even while wearing sailing gloves. This innovative block features a spring-loaded side opening mechanism that allows quick attachment and removal from sheets without threading. Black anodized aluminum sideplates provide exceptional strength while protective polyurethane bumpers safeguard both the block and your boat's deck and topsides.

Key Features:

• Spring-loaded button release enables true one-handed operation for quick rigging and removal
• Side-opening sideplate design eliminates need to thread line through block
• Anti-capsize bar maintains proper sheave alignment on the sheet
• ULC main bearing system ensures smooth rotation under extreme loads
• Sideload balls distribute forces when block operates off-axis in light air conditions
• Thimble at pivot base allows versatile 1:1 or 2:1 control configurations
• Machined aluminum inner sideplates deliver high strength-to-weight ratio
• Soft polyurethane outer bumpers protect block and deck surfaces from damage

Common Applications:

• Twing and tweaker control for code zero sheets
• Spinnaker sheet and guy control systems
• Can function as a snatch block when paired with a soft shackle

Technical Specifications:

• Sheave diameter: 38.5mm (1-1/2")
• Maximum line diameter: 11mm (0.43")
• Maximum working load: 1000kg (2205 lbs)
• Breaking load: 2000kg (4409 lbs)

The Harken 3405 shares its proven bearing system with Harken's 2.3-ton high-load snatch block, ensuring reliable performance in demanding sailing conditions.