Harken 57mm Aluminum Low-load Double block, swivel
Description - The entire line of Black Magic® AirBlocks® has been redesigned with a sleek new look. Their unique, performance-packed engineering remains exactly the same. These strong, lightweight blocks feature free-rolling high-load Torlon® roller bearings for a high strength-to weight ratio.
Like all AirBlocks®, the three-way head swivels/locks in front/side positions. Blocks are easily disassembled with a single hex wrench.
Low-load blocks use Torlon® rollers and 316 stainless steel shackles. Standard blocks have 17-4PH stainless headposts.
Sheave Ø (mm) - 57
Sheave Ø (in) - 2 1/4
Length (mm) - 132
Length (in) - 5 3/16
Weight (g) - 342
Weight (oz) - 12.05
Shackle pin Ø (mm) - 8
Shackle pin Ø (in) - 5/16
Maximum line Ø (mm) - 12
Maximum line Ø (in) - 7/16
Maximum working load (kg) - 1250
Maximum working load (lb) - 2755
Breaking load (kg) - 2500
Breaking load (lb) - 5510