45MM SINGLE BLACK MAGIC AIR ALUMINUM BLOCK W/SWIVEL

Harken 45mm Black Magic Aluminum Block with Swivel

The Harken 45mm Black Magic Aluminum Block with Swivel is a compact, high-load pulley built for demanding rigging applications where strength, smooth line movement, and durability matter. Unlike the lightweight Carbo blocks, the Black Magic series uses aluminum sideplates and sheaves for added strength in a smaller, tougher package.

This block is a strong option for outrigger rigging, dredge pulley setups, teaser systems, halyard-style applications, and custom marine rigging where you need a low-friction block that can handle serious load. The swivel head helps the block align naturally under pressure, reducing line twist and keeping your rigging running clean.

Key Features

• Single 45mm aluminum sheave design
• Swivel head for cleaner line alignment
• Black Magic Air aluminum construction
• High-load Torlon roller bearings for smooth operation
• Stronger working load than many similar-sized blocks
• Compact size with excellent strength-to-weight ratio
• Works with line up to 3/8"
• Great for custom rigging, dredge setups, teaser systems, outrigger rigging, and marine tackle applications
• Manufacturer part number: 3391

Specs

• Sheave: 45mm / 1-3/4"
• Length: 100mm / 3-15/16"
• Weight: 2.79 oz / 79g
• Shackle Pin: 3/16" / 5mm
• Max Line Diameter: 3/8" / 10mm
• Max Working Load: 1,653 lb / 750kg
• Breaking Load: 3,306 lb / 1,500kg

The Harken 45mm Black Magic Aluminum Block is a serious little pulley for crews who need compact size, smooth operation, and high-load performance in one clean rigging package.