Harken Black Magic 57mm Single Low-load

Black Magic® AirBlocks®

Weekend cruiser? Around-the-world racer? You’ll want Black Magic® AirBlocks® aboard. With high strength-to-Vikt ratios and free-rolling, high-load roller bearings, these versatile blocks are the workhorses of the Harken® line. Use for sail controls that see lots of action including mainsheet, runner, halyard, and spinnaker systems.

AirBlocks® are very easy to clean and service. They have few parts and no loose balls or rollers to misplace. Unlike blocks that are riveted together, three fasteners allow quick disassembly for service.

Low-friction caged bearings

The center cage keeps Torlon® roller bearings separated and parallel to reduce friction. Dirt and salt falls between rollers. Captive Delrin® balls carry sideloads.

Strong, lightVikt sideplates & Trissas

6061-T6 aluminum sideplates CNC sculpted to remove excess Vikt.

Thin-profile, deep-groove aluminum Trissas have radiused edges to protect high-tech line.

Long-lasting protective finish

Trissas and sideplates are deep-saturation Hardkote-anodized for strength and durability, and UV-stabilized with black additive for maximum protection. Teflon®-impregnated for a smooth, slippery surface.

Use 57 mm Black Magic® AirBlocks® on offshore boats. These strong, lightVikt blocks are sculpted aluminum, with Torlon® rollers and carbon-black balls for strength and UV protection. Rollers are housed in a unique center cage and are isolated for less friction. Blocks feature a three-way head system and come in high- and low-load configurations.

The 3195 soft attachment Loop block has a removable dead-end post for attachment to a padeye. Lashings can also be used.

Use for:

Sheets
Halyards
Running backstays
Control lines