| About Harken Big Boat Blocks |
 Harken Big Boat Black Magic® AirBlocks®
With high strength-to-weight 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.
Harken 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.
1. Isolated Metals. Dissimilar metals isolated to prevent corrosion: plastic isolators under all fastener heads and headposts.
Three-Way Head. Set screw in three-way head locks shackle in front or side positions, or lets block swivel to keep line from twisting.
2. Easy Maintenance. AirBlocks® are designed for easy maintenance. Three fasteners allow
quick disassembly using an Allen wrench. Blocks have few parts, and there are no loose balls or rollers.
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, Lightweght Sideplates & Sheaves. 6061-T6 aluminum sideplates CNC sculpted to remove excess weight. Thin-profile, deep-groove aluminum sheaves have radiused edges to protect high-tech line.
Long-Lasting Protective Finish. Sheaves 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.
Select the appropriate Harken block with the Big Boat Block Use Chart
View Technical Information for:
Harken Big Boat Blocks
Harken Cruising ESP Blocks
Harken Footblocks
Read about Harken Big Boat Blocks
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