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Harken 125 mm Black Magic, AirBlock Stand-up
Cat. No. HAR 3261
Weight 3.5 lbs

3018 125 mm Stand-up Block

125 mm AirBlocks® feature Torlon® rollers in a self-contained center cage. Rollers stay parallel for low-friction efficiency. UV-resistant, carbon-black Delrin® balls carry sideloads.

Used on offshore boats, these blocks offer a no “climb-out” deep groove sheave with radiused edges to protect line. Sculpted aluminum sideplates and thin-profile sheaves make these blocks very lightweight. No stainless-to-aluminum contact prevents corrosion.

Use for:
Running backstays
Control lines

Description Stand-up*
Sheave dia. (mm) 125
Length (in) 9 1/16
Weight w/shackle (oz) 43.9
Shackle pin dia. (in) -
Max. line dia. (in) 3/4
SWL (lb) 11000
Breaking strength (lb) 22000
A (in) 3 11/16
B (in) 4 1/8
C (in) 2 3/8

*Uses 648 padeye

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