Harken 40 mm Flip-Flop Block

Harken 40 mm Flip-Flop Block

The Harken 40 mm Flip-Flop Block (Part No. 2181) is engineered specifically for small boat sailors who demand precise, low-profile line management. The block pivots around the line axis, holding lines close to the deck or mast surface and reducing clutter on crowded decks. Its signature hinged construction enables a wide range of lead angles, giving sailors the flexibility to adjust trim continuously while repositioning weight for shifting conditions — a critical advantage in dinghy and one-design racing.

Constructed from carbo composite materials and equipped with high-load ball bearings, this block delivers smooth, reliable performance under the demanding loads typical of small boat sailing. The 40 mm sheave diameter accommodates lines up to 10 mm (3/8 in), and at only 45 g (1.6 oz), the block adds minimal weight aloft or on deck. Its compact footprint — 81 mm long, 43 mm wide, and 54 mm tall — makes it easy to integrate into tight deck layouts without interfering with adjacent hardware.

The 360-degree line entry capability of the Flip-Flop design means the block self-orients as load direction changes, maintaining efficient lead geometry without manual adjustment. This makes it ideal for applications such as mainsheet systems, vang controls, and other running rigging on small boats where the line angle shifts frequently during sailing maneuvers.

Key Features

• Pivots around the line axis to keep lines close to the deck or mast
• Hinged construction allows various lead angles for flexible trimming
• 360-degree line entry for self-orienting performance
• Carbo composite construction for durability and light weight
• High-load ball bearings for smooth, low-friction operation
• Accepts lines up to 10 mm (3/8 in)
• Lightweight at only 45 g (1.6 oz)
• Compact dimensions suitable for small boat deck layouts
• Compatible with Harken cam cleats and complementary hardware