75MM SINGLE BLACK MAGIC AIR ALUMINUM BLOCK W/SWIVEL

Harken 75mm Black Magic Aluminum Block with Swivel

The Harken 75mm Black Magic Aluminum Block with Swivel is a heavy-duty, high-load pulley built for serious rigging applications where strength, smooth operation, and durability are non-negotiable. With a 75mm aluminum sheave and a 5,000 lb maximum working load, this block is made to handle demanding line systems while still running clean and efficient.

The swivel head allows the block to align naturally under load, helping reduce line twist and keeping your rigging moving smoothly. It’s a strong choice for heavy outrigger rigging, dredge pulley setups, teaser systems, halyard-style applications, and custom marine rigging where load capacity matters.

Key Features

• Single 75mm aluminum sheave design
• Swivel head for cleaner line alignment
• Black Magic aluminum construction
• High-load design for demanding rigging applications
• Smooth-running Torlon roller bearing system
• Excellent strength-to-weight ratio
• Works with line up to 9/16"
• Great for heavy custom rigging, dredge setups, teaser systems, outrigger rigging, and marine tackle applications
• Manufacturer part number: 3231

Specs

• Sheave: 75mm / 2-15/16"
• Length: 129mm / 5-1/8"
• Weight: 11.68 oz / 331g
• Shackle Pin: 5/16" / 8mm
• Max Line Diameter: 9/16" / 14mm
• Max Working Load: 5,000 lb / 2,268kg
• Breaking Load: 10,000 lb / 4,536kg

The Harken 75mm Black Magic Aluminum Block is a serious offshore rigging option for crews who need smooth line control, compact strength, and heavy-load performance in one dependable pulley.