HARKEN–57mm Black Magic® High-Load Single Block
57mm Black Magic® High-Load Single Block
|Diameter||7/16 Inch or 11 mm|
|Integral Cleat||No Integral Cleat|
|Length||4 11/16 Inches|
|Mount Type||Swivel Shackle|
|Safe Working Load||2500 Pounds|
|Sheave Diameter||57 mm|
Torlon® Roller bearings are housed in a center cage and stay parallel for low-friction efficiency.
The entire line of Black Magic® AirBlocks® offer a sleek and polished look. Their unique performance engineering remains the staple of the Black Magic line of blocks. These strong, lightweight blocks feature free-rolling, high-load Torlon® roller bearings for a high strength-to-weight ratio. Used for dynamic high load sail controls including mainsheets, runners, halyards and spinnaker systems.
Air blocks are easy to clean and service. They have few parts and no loose balls or rollers to misplace. Unlike blocks that are riveted, fasteners allow quick disassembly with a single hex wrench.
- Lightweight blocks with high-load Torlon® roller bearings for a high strength-to-weight ratio
- Ideal for sail controls including mainsheet, runner, halyard, and spinnaker systems
- Center cage keeps Torlon® roller bearings separated and parallel to reduce friction
- Sheaves have radiused edges to protect today’s high-tech line
- Stainless steel swivel shackle
- Sheave Diameter: 2 1/4" (57 mm)
- Max. Line Diameter: 7/16" (12 mm)
- Max. Working Load (MWL): 2500 lb. (1134 kg)
- Breaking Load: 5000 lb. (2268 kg)
- Weight: 5.36 oz. (152 g)
- Length: 4 11/16" (119 mm)
The West Advisor articles have answered boaters' questions and provided solutions to boating problems for more than 20 years. West Marine has compiled one of the Web's most comprehensive collections of technical boating information articles.