Harken 57mm Black Magic Air Blocks

Harken Black Magic Air blocks are lightweight, free-running, powerful performers ideally suited to hard-working sail controls, e.g. mainsheet, runners, halyards or Spinnaker systems sheets and guys.

Harken 57mm Black Magic Air Blocks: Facts, Features and Plus Factors

• Sheave Diameter: 45mm
• Low-friction efficiency for fast, accurate trim and release
• The Centre cage keeps the Torlon® roller bearings separated and parallel to reduce friction.
• Captive Delrin® ball bearings carry side loads
• High-strength, lightweight aluminium sheaves and side plates, CNC sculpted for optimum load capacity to weight ratio
• Excellent durability: sun and salt-resistant
• Smooth finish, hard-lube anodised 6061-T6 aluminium side plates, and sheaves deliver maximum UV protection 
• Dissimilar metals are isolated to prevent corrosion caused by galvanic reaction
• Triple Function three-way Set Screw Shackle Head
• Shackle Head options: 360-degree swivel rotation to alleviate rope twist, fixed in line or fixed at 90 degrees 
• Soft-Attach options: patented loop or lash through the middle of the sheave instead of the head.
• The primary load is carried by the centre of the sheave for weight efficiency and compactness
• Patented Soft-Attach Loop blocks: removable dead-end post for attachment to a pad eye
• Easy maintenance: quick disassembly with a hex spanner - minimum fastenings with no loose balls or rollers

MBL = Harken Manufacturer Break Load

MWL = Harken Maximum Working Load

Ø = diameter