Harken 300 25mm Wire Block with Shackle Single Sheave

The Harken 300 is a compact, high-performance 25mm single block designed for wire halyards, vangs, and control line applications on sailboats. This lightweight block features high-load composite bearings that efficiently carry axial loads while minimizing friction, making it ideal for demanding sailing conditions.

Key Features:

• 25mm (1") hard-anodized aluminum sheave with Hardkote finish for exceptional strength and corrosion resistance
• High-load composite bearings with side-load carbon-black Delrin® washers to reduce friction from twists and unfair leads
• Polished stainless steel strap-type fixed shackle for secure attachment
• Block opens to allow passage of swaged wire for easy rigging
• Maximum wire diameter: 5/32" (4mm)
• Maximum working load: 1,000 lbs (454 kg)
• Breaking strength: 2,000 lbs (907 kg)
• Ultra-lightweight: 1 oz (28g)

Harken's proven bearing system and precision engineering deliver smooth, reliable performance for wire halyards and control line cascades. The anodized aluminum construction provides excellent corrosion resistance for marine environments while keeping weight to a minimum.