Harken 381 29mm Carbo Air Double Block Fixed Head

The Harken 381 is a 29mm Carbo Air® Double Block with fixed head design, engineered for high-performance sailing applications requiring 2:1 or 3:1 purchasing systems. This award-winning block combines exceptional strength with ultralight weight, making it ideal for racers and performance sailors who demand reliability without compromising speed.

Revolutionary Carbo Air® Construction:

Harken's Carbo Air® technology delivers a strength-to-weight ratio that sets the industry standard. The fiber-reinforced composite sideplates are UV-stabilized for long-term durability and designed specifically for the small-diameter, high-tech lines preferred on racing boats. This innovative design earned both the prestigious Dame Award and Sail Magazine's Freeman-Pittman Award for marine innovation.

Performance Advantages:

• 30% lighter than equivalent conventional blocks
• 60% stronger than comparable Classic series blocks
• Double sheave configuration for versatile purchase systems
• Low-friction operation for smooth, easy trimming
• Compact footprint perfect for space-limited applications
• Fixed head design provides secure, stable mounting

Specifications:

• Sheave Diameter: 1 1/8" (29mm)
• Maximum Line Diameter: 5/16" (8mm)
• Maximum Working Load: 660 lbs (299 kg)
• Breaking Load: 1,625 lbs (737 kg)
• Weight: 1.2 oz (34 g)
• Overall Length: 2 1/8" (54mm)

Applications:

Ideal for jib and mainsheet systems on high-performance dinghies, control lines on small keelboats, and any application where minimizing weight while maximizing strength is critical. The compact size and high working load make these blocks perfect for modern racing setups using high-tech, low-diameter lines.