Harken 40mm Carbo Air Fiddle Block w/Swivel & Becket

The Harken 40mm Carbo Air Fiddle Block with Swivel and Becket is a lightweight rigging component engineered for demanding marine applications requiring reliable load handling and minimal friction. This fiddle block delivers exceptional strength-to-weight ratio, making it the preferred choice for sailors managing complex tackle systems on dinghies and larger vessels where precision control and durability directly impact safety and performance.

The 40mm Carbo Air fiddle block features low-friction sheave technology paired with swivel and becket attachments, enabling efficient power transfer in 3:1 and 4:1 tackle configurations. The integrated swivel prevents line twist during operation, while the becket attachment point allows secure fastening to spars, booms, and structural elements. At just 0.15 lbs, the block maintains high working loads while reducing overall system weight—a critical advantage for applications where cumulative weight impacts boat handling and crew fatigue during extended sailing.

Sailors use this 40mm block specifically for dinghy vang and mainsheet control, as well as cunningham and internal boom outhaul systems on cruising and racing yachts. The compact footprint (3 × 1 × 6 inches) fits tight deck layouts without sacrificing load capacity. Harken's Carbo Air lineup is recognized in the marine industry for balancing performance with affordability, making professional-grade rigging accessible beyond premium racing budgets.