Harken 2652 40mm Carbo Air Stand-up Block Fixed Single

The Harken 2652 40mm Carbo Air® Stand-Up Block (Fixed) is a low-friction, fiber-reinforced composite sailing block engineered for high-performance trimming on sportboats and dinghies. Designed to stand upright on deck with a fixed mount, this compact block excels as a turning point for jib sheets, mainsheets, and spinnaker sheets, and is equally capable as a high-load control line block on small keelboats.

Part of Harken's award-winning Carbo Air® line, the 2652 delivers an outstanding strength-to-weight ratio — 60% stronger and 30% lighter than equivalent Classic blocks — making it a top choice for performance sailors and racers who demand reliability without unnecessary weight.

Key Features:

• Open Air Block design eliminates excess material for maximum weight savings
• Fiber-reinforced nylon-resin sideplates densely packed with long-glass fibers for superior strength-to-weight ratio
• High-load ball bearings ride on fitted curved races for smooth, low-friction sheave rotation
• UV-stabilized carbon black treatment on ball bearings, sheave, and sideplates for long-term protection against sun and saltwater
• Fixed stand-up mount holds the block upright on deck for easy line lead and purchase system setup
• Compatible with lines up to 3/8 in (10 mm) diameter
• Maximum working load: 485 lb (220 kg)
• Breaking load: 1,620 lb (735 kg)
• Sheave diameter: 1-9/16 in (40 mm)
• Block length: 2-3/4 in (70 mm)
• Weight with shackle: 1.7 oz (48 g)

Recipient of both the Dame Award and Sail Magazine's Freeman-Pittman Award for innovation, the Carbo Air® series represents a proven solution for sailors who need compact, powerful blocks that stand up to demanding conditions. The Harken 2652 is an ideal fixed turning block for building efficient 2:1 or 3:1 purchase systems on performance dinghies and small keelboats.