Harken 40mm Twing Block - Lightweight Carbo Air Small Boat Block for Easy Trimming

40mm Twing Block

Low-friction Carbo Air blocks are lightweight, strong, reliableand affordable. Companions to our popular Harken Big Boat blocks, these small, compact blocks have very high working loads for safe, easy trimming.

Features:

• Opening side plate - Easy to rig and remove from sheet
• Spring biased to open when unlatched - One-handed operation
• Roller at pivot base - Use 1:1 or 2:1 up-down control
• Carbo Air block construction - High strength for durability and lightweight for maximum float in light air

Uses:

• Dinghies, sport boats, and small keelboats
• Spinnaker sheet and guy control
• Code zero sheet up-down control

Specifications:

• Sheave (mm): 40 mm
• Sheave (in): 1-9/16 in
• Length (mm): 89 mm
• Length (in): 3-1/2 in
• Weight (g): 86 g
• Weight (oz): 3 oz
• Maximum line (mm): 12 mm
• Maximum line (in): 3/8 in
• Maximum working load (kg): 275 kg
• Maximum working load (lb): 606 lb
• Breaking load (kg): 825 kg
• Breaking load (lb): 1818 lb

The Harken 40mm Twing Block is designed for small boats, sport vessels, and dinghies, offering a reliable and lightweight solution for controlling spinnaker sheets, guys, and code zero sheets. Constructed with high-strength Carbo Air material, this block combines durability with minimal weight, making it ideal for applications requiring maximum floatation in light air conditions. Its compact design ensures ease of handling and efficient performance during sail trimming and sheet control.
The Twing Block features an opening side plate that allows for quick and effortless rigging or removal from the sheet, streamlining setup and adjustments. Spring-biased to open when unlatched, it enables one-handed operation for swift sail management. Additionally, the roller at the pivot base supports 1:1 or 2:1 up-down control, providing versatile line control options for various sailing needs. The sturdy construction and high working load capacity make it suitable for use on dinghies, sport boats, and small keelboats, ensuring safe operation even under demanding conditions.
Designed with ease of use and performance in mind, the Harken 40mm Twing Block is a dependable choice for sailors seeking a compact, lightweight, and high-capacity block. Its features support smooth line handling and quick adjustments, which are critical during competitive racing or casual cruising. The product's specifications include a 40mm sheave, a maximum line diameter of 3/8 inch, and a maximum working load of 606 pounds, with a breaking load of 1818 pounds, ensuring robust performance across a variety of sailing applications. For detailed installation instructions and maintenance information, please refer to the owner’s manual available online.

Features:

• Opening side plate for easy rigging and removal from sheet

• Spring-biased to open when unlatched for one-handed operation

• Roller at pivot base supports 1:1 or 2:1 control ratios

• Constructed with high-strength Carbo Air material for durability and lightweight performance