40 mm Flip-Flop SB Block — Cam Cleat

Harken 40 mm Flip-Flop SB Block — Cam Cleat

The Harken 40 mm Flip-Flop SB Block with Cam Cleat is engineered specifically for small boat sailors who need a versatile, low-profile block capable of handling dynamic on-water conditions. The Flip-Flop design pivots around the line axis to keep the line as close to the deck or mast as possible, reducing windage and maintaining a tidy rig. This pivoting action is achieved through a hinged construction that allows the block to accommodate a wide range of lead angles without compromising performance or line control.

Sailors benefit from the ability to shift their weight placement to adapt to changing wind and sea conditions while still making continuous trim adjustments. The integrated Harken Cam-Matic® Cleat (part number 150) is pre-mounted directly on the block, making it straightforward to secure and release lines quickly under load. This combination of block and cleat in a single compact unit reduces hardware complexity on deck and streamlines rigging setups for dinghies, small keelboats, and similar vessels.

Built to Harken's exacting standards, the block handles a maximum working load of 136 kg (300 lb) and accepts line up to 10 mm (3/8 in) in diameter. The 40 mm sheave provides smooth, low-friction line movement, while the overall dimensions keep the unit compact and easy to integrate into a variety of deck layouts. Engineering drawings and 3D model files are available for download, making it straightforward to plan installations.

Key Features

• Flip-Flop design pivots around the line axis to keep lines low to the deck or mast
• Hinged construction supports a variety of lead angles for flexible rigging configurations
• Allows sailors to shift weight placement while maintaining continuous trim control
• Includes pre-mounted Harken Cam-Matic® Cleat (part number 150) for fast line securing and release
• 40 mm sheave diameter for smooth, low-friction line movement
• Maximum working load of 136 kg (300 lb)
• Accepts maximum line diameter of 10 mm (3/8 in)
• Compact dimensions: 81 mm L × 66 mm W × 87 mm H
• Lightweight at 200 g (7 oz)
• Suitable for demanding small boat and dinghy sailing applications