Harken 16 mm Hook-In Halyard Block 391

The Harken 16mm Hook-In Halyard Block 391 is Harken’s smallest sailing block, designed specifically for lightweight synthetic control lines and halyard systems on modern high-performance dinghies. Featuring a patented stainless steel ball bearing system, it delivers exceptionally smooth operation, low friction, and reliable performance in compact rigging applications.

The Harken 16mm Hook-In Halyard Block 391 is the smallest block in the Harken range, engineered for lightweight control systems found on today's high-performance dinghies and racing sailboats. Compact, strong, and exceptionally efficient, it is ideally suited to modern synthetic control lines where minimal weight and low friction are essential.

Despite its small size, the 391 incorporates Harken's patented bearing system, utilising stainless steel ball bearings running in a captive grooved race. This advanced design minimises friction under load, allowing control lines and halyards to run smoothly and efficiently while maintaining excellent durability in demanding marine environments.

The hook-in design makes the block particularly useful for halyard systems and other rigging applications where a lightweight, compact attachment method is preferred. Its small footprint allows it to be used in confined rigging spaces while still delivering dependable performance under load.

Designed to accommodate lines up to 5mm in diameter, the block is perfectly suited to modern high-strength synthetic ropes commonly used on racing dinghies, skiffs, foiling classes, and other performance sailing craft.

With a maximum working load of 113kg and a breaking load of 181kg, the Harken 391 offers an impressive strength-to-weight ratio while weighing just 13 grams, making it an excellent choice for sailors seeking maximum performance and minimum weight.

Key Features

• Harken's smallest sailing block
• Compact hook-in halyard block design
• Patented stainless steel ball bearing system
• Captive grooved bearing race
• Extremely low friction performance
• Lightweight construction at only 13g
• Ideal for modern synthetic control lines
• Smooth operation under load
• Strong and durable marine-grade construction
• Perfect for high-performance dinghy applications

Ideal For

• Halyard systems
• Dinghy sailing
• Skiff racing
• Foiling classes
• High-performance racing dinghies
• Lightweight control systems
• Synthetic control lines
• Cunningham systems
• Vang controls
• Technical rigging applications

Technical Specifications

• Model: 391
• Block Type: Hook-In Halyard Block
• Sheave Diameter: 16mm
• Length: 41mm
• Weight: 13g
• Maximum Line Diameter: 5mm
• Maximum Working Load: 113kg
• Breaking Load: 181kg
• Bearing System: Stainless Steel Ball Bearings
• Bearing Race: Captive Grooved Race

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