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The 25mm Harken Fly Block is engineered to deliver maximum strength with minimal mass, offering sailors significant power within a compact, low-aerodynamic profile. Specifically designed for use with high-tech line, these efficient blocks provide an exceptional working load relative to their small size. The unit features a high-strength cast stainless steel boom key, uniquely shaped and angled to minimize weight while ensuring the block remains securely in place, even under zero tension.
High Strength-to-Weight Ratio: Provides big power in a low aero package, designed to offer strength without unnecessary mass.
High-Tech Line Compatibility: Specifically designed for high-tech line, delivering an incredible working load for its small size.
Cast Stainless Steel Boom Key: High-strength cast stainless steel construction, uniquely shaped and angled to minimize weight.
Zero-Tension Retention: The boom key design ensures the block remains in place, even under zero tension conditions.
Specifications
• Brand: Harken
• Reference: 1250.ILCA
• Sheave Ø: 25 mm
• Length: 44 mm
• Weight: 34 g
• Maximum line Ø: 5 mm
• Maximum working load: 275 kg
• Breaking load: 550 kg






