Harken 57mm Swivel Carbon Air Block Pully
The Harken 57mm Swivel Carbo Air Block is a lightweight, high-strength single block designed for smooth line handling under demanding loads. Its low-friction ball bearing system provides efficient operation for general-purpose rigging, while fiber-reinforced composite construction delivers an excellent strength-to-weight ratio. Compared with equivalent Harken Classic blocks, the Carbo Air design is approximately 30% lighter and 60% stronger, providing substantial load capacity in a compact package.
UV-stabilized, high-strength resin sideplates provide durability in marine environments and are optimized for the smaller-diameter lines commonly used in performance rigging. A stainless steel swivel shackle provides a secure and versatile attachment point. With a 57mm sheave, 10mm maximum line diameter, and 792 lb maximum working load, this block is suitable for jib and mainsheet systems on high-performance dinghies as well as high-load control lines on small keelboats.
| Sheave Ø (mm) | 57 mm |
| Sheave Ø (in) | 2 1/4 in |
| Length (mm) | 110 mm |
| Length (in) | 4 5/16 in |
| Weight (g) | 87 g |
| Weight (oz) | 3.1 oz |
| Shackle pin Ø (mm) | 5 mm |
| Shackle pin Ø (in) | 3/16 in |
| Maximum line Ø (mm) | 10 mm |
| Maximum line Ø (in) | 3/8 in |
| Maximum working load (kg) | 359 kg |
| Maximum working load (lb) | 792 lb |
| Breaking load (kg) | 1079 kg |
| Breaking load (lb) | 2380 lb |