My Account
Reward Points
Fast Shipping
Shipping Available
Harken 57mm Triple Block — Swivel is a high-load, high-efficiency solution designed for powerful purchase systems in demanding sailing applications. Part of the proven Carbo Air range, this triple block delivers exceptional strength, smooth operation and reliability in a compact, lightweight design.
Featuring three sheaves for maximum mechanical advantage, this block is ideal for control systems requiring increased power and fine-tuned adjustment. The swivel head allows the block to align naturally under load, reducing friction and ensuring efficient trimming in dynamic conditions.
Built as a companion to Harken Big Boat blocks, the 57mm Carbo Air Triple Block offers outstanding working loads while remaining easy to handle. Perfect for vangs, mainsheet systems and other high-load control setups on dinghies, keelboats and small yachts.
Specifications
Length: 121 mm / 4 3/4 in
Weight: 255 g / 9 oz
Sheave Diameter: 57 mm / 2 1/4 in
Maximum Line Diameter: 10 mm / 3/8 in
Maximum Working Load: 1080 kg / 2380 lb
Breaking Load: 2270 kg / 5000 lb
Shackle Pin Diameter: 6 mm / 1/4 in
Key Features
- Triple sheave design for maximum mechanical advantage
- Low-friction Carbo Air construction for smooth, efficient performance
- High working load capacity for demanding control systems
- Swivel head for optimal alignment under load
- Lightweight yet strong for performance sailing applications
- Compact and durable construction for harsh marine environments
- Ideal for vangs, mainsheet systems and high-load purchase setups
- Suitable for dinghies, keelboats and small yachts
- Reliable performance for both racing and cruising
