Harken 3405 1 Ton Twing Block, 2,205 lb Working Load

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 3405 1 Ton Twing Block is a high-load sailing block designed for one-handed rigging of twing, tweaker, spinnaker sheet, and guy-control systems. Its spring-loaded side-opening mechanism makes it easier to rig or remove from a sheet while wearing sailing gloves, while the aluminum construction delivers a strong, lightweight solution for demanding onboard line-control applications.

Built for reliable performance under heavy loading, the block combines an aluminum sheave with a bearing system shared with Harken's 2.3T high-load snatch block. The anti-capsize bar helps keep the sheave aligned on the sheet, while sideload balls support loads when the block is not aligned in light air. A thimble at the pivot base enables either 1:1 or 2:1 up-down control, adding flexibility for different rigging arrangements.

The Harken 3405 can also be used as a snatch block when combined with a soft shackle. Black anodized aluminum sideplates provide strength and reduced weight, while soft polyurethane outer bumpers help protect the block, topsides, and deck during use. With a maximum working load of 2,205 pounds and a breaking load of 4,409 pounds, this Harken 1 Ton Twing Block is suited for sailors who need dependable control of high-load sheets and running rigging.

Key Features:

• Spring-loaded side opening: Enables quick, one-handed rigging and sheet removal.
• Anti-capsize bar: Helps keep the sheave aligned on the sheet.
• ULC main bearing: Supports smooth sheave rotation under extreme loading.
• Sideload balls: Carry loads when the block is not aligned in light air.
• Protective bumpers: Soft polyurethane outer sideplate bumpers help protect the block and deck.
• Flexible rigging: Thimble at the pivot base supports 1:1 or 2:1 up-down control.

Product Details:

• Brand: Harken
• Part number: 3405
• Product type: 1 Ton Twing Block
• Sheave diameter: 1-1/2 inches
• Maximum line size: 0.43 inches
• Maximum working load: 2,205 pounds
• Breaking load: 4,409 pounds
• Construction: Machined and anodized aluminum sideplates with an aluminum sheave
• Intended uses: Code zero twing or tweaker control, spinnaker sheet and guy control, and snatch-block use with a soft shackle

Choose the Harken 3405 1 Ton Twing Block for streamlined one-handed rigging and high-load control across demanding sailing applications.

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