Harken 1 Ton Twing Block Part Number 3405 for Sailboat Rigging and Control

1 Ton Twing Block

The Twing block features a spring-loaded side opening mechanism for true one-handed rigging, even while wearing sailing gloves. Black anodized aluminum sideplates are edged with robust bumpers to protect the block, topsides, and deck. The sheave is aluminum rolling on a bearing system shared with Harken's existing 2.3T high-load snatch block.

Features:

• Side opening side plate - Easy to rig and remove from sheet
• Spring loaded button release - Quick one-handed rigging
• Anti-capsize bar - Keeps sheave aligned on sheet
• ULC main bearing - Sheave turns smoothly under extreme loading
• Sideload balls - Carry loads especially when the block is not aligned in light air
• Thimble at pivot base - Use 1:1 or 2:1 up-down control
• Machined aluminum inner sideplates - High strength, low weight
• Soft polyurethane outer side plate bumpers - Protects block and deck

Uses:

• Twing, tweaker control for code zero sheets
• Can be used as a snatch block when combined with a soft shackle
• Spinnaker sheet and guy control

Specifications:

• Sheave (mm): 38.5 mm
• Sheave (in): 1-1/2 in
• Maximum line (mm): 11 mm
• Maximum line (in): .43 in
• Maximum working load (kg): 1000 kg
• Maximum working load (lb): 2205 lb
• Breaking load (kg): 2000 kg
• Breaking load (lb): 4409 lb

The Harken 1 Ton Twing Block Part Number 3405 is a versatile and durable component designed for demanding sailing applications. Crafted with high-strength machined aluminum inner sideplates and featuring a spring-loaded side opening mechanism, this block allows for true one-handed rigging even while wearing sailing gloves. The black anodized aluminum sideplates are edged with robust bumpers to protect the block, topsides, and deck from impacts during operation. The aluminum sheave, which rolls smoothly on a bearing system shared with Harken's high-load snatch blocks, is designed to handle lines up to 11 mm in diameter, making it suitable for various sheet and control lines.

The Twing block's side opening side plate simplifies rigging and removal from sheets, while its spring-loaded button release allows quick, one-handed operation. An anti-capsize bar ensures that the sheave remains aligned on the sheet, even under extreme loads, while sideload balls provide additional support when the block is not perfectly aligned in light air conditions. The pivot base includes a thimble for use with 1:1 or 2:1 control systems, enhancing its versatility for different rigging configurations. Soft polyurethane outer bumpers protect both the block and the deck, adding to its durability and longevity.

This block is ideal for Twing or tweaker control for code zero sheets, as a snatch block when combined with a soft shackle, or for spinnaker sheet and guy control. With a maximum working load of 2,205 pounds and a breaking load of 4,409 pounds, the Harken 1 Ton Twing Block provides reliable performance under extreme conditions, ensuring safety and efficiency for serious sailors. Its compact design and high-performance features make it an essential component for modern sailing rigs, offering ease of use, strength, and protection in a lightweight package.

Features:

• Side opening side plate for easy rigging and removal

• Spring-loaded button release for quick, one-handed operation

• Anti-capsize bar to maintain sheave alignment under load

• ULC main bearing ensures smooth sheave rotation under extreme loads

• Sideload balls support load distribution when misaligned

• Thimble at pivot base for use with 1:1 or 2:1 control systems

• Machined aluminum inner sideplates for high strength and low weight

• Soft polyurethane outer bumpers protect the block and deck