Harken 2650 40mm Carbo Air Single Block Fixed Sailboat Block

The Harken 2650 Carbo Air® Single Block is a high-performance, fixed-head sailboat block engineered for demanding applications on dinghies and small keelboats. Part of Harken's acclaimed Carbo Air® line, the 2650 delivers an outstanding strength-to-weight ratio — 60% stronger and 30% lighter than equivalent Classic blocks — making it a top choice for weight-conscious racers and performance sailors alike.

The block features a 40mm (1-9/16") sheave diameter and accepts line up to 10mm (3/8") in diameter. Nylon-resin sideplates are densely packed with long-glass fibers, providing a compact, rigid structure capable of a 485 lb (220 kg) maximum working load and a 1,620 lb (735 kg) breaking load. Sheaves spin on high-load ball bearings with fitted races for smooth, low-friction operation under load.

Key Features:

• 40mm (1-9/16") sheave diameter
• Maximum working load: 485 lb (220 kg)
• Breaking load: 1,620 lb (735 kg)
• Maximum line diameter: 10mm (3/8")
• 60% stronger and 30% lighter than Harken Classic blocks
• Nylon-resin sideplates with long-glass fiber reinforcement for high strength-to-weight ratio
• Ball bearings, sheave, and sideplates UV-stabilized with carbon black for maximum sun and salt protection
• Three-way head swivels and locks in front or side positions to prevent line twist
• Easily disassembled with a single Allen® wrench for maintenance
• Lightweight at only 40g (1.4 oz)

Ideal Applications:

• Main sheets and jib sheets
• Mainsheet fine-tune systems
• Control lines, vangs, and cunninghams
• Outhauls on high-performance dinghies and small keelboats

The Harken 2650 Carbo Air® block is built to withstand the rigors of saltwater sailing, delivering consistent, low-friction performance race after race.