Harken 57mm Aluminum Low-load Double block, swivel becket
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) - 140
Length (in) - 5 1/2
Weight (g) - 169
Weight (oz) - 5.95
Shackle pin Ø (mm) - 6
Shackle pin Ø (in) - 1/4
Maximum line Ø (mm) - 12
Maximum line Ø (in) - 7/16
Maximum working load (kg) - 750
Maximum working load (lb) - 1655
Breaking load (kg) - 1500
Breaking load (lb) - 3310