RECENTLY VIEWED
Skip to main content
DK Hardware Professional Tax Exempt? Net 30? - DK Net Terms
Roll over image to zoom in
Product Features
Product Overview
Related Videos
Reviews
Questions & Answers
See reviewsSee reviews
30 Days Easy Return. We are the largest supplier of the most adaptable, personalized hardware in the industry. We work hard to ensure you're satisfied with our products.
WARNING: This Product May Contain Chemicals Known to the State of California to Cause Cancer or Reproductive Harm. To Learn More Visit P65Warnings.ca.gov
Features
- 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
- Use on running backstays with offshore boats
- Recessed cotter key won t snag lifelines
- Sheave Diameter: 2 1/4" (57 mm)
- Max. Line Diameter: 1/2" (12 mm)
- Max. Working Load (MWL): 2500 lb. (1134 kg)
- Breaking Load: 5000 lb. (2268 kg)
- Weight: 4.42 oz. (125 g)
- Length: 3 3/8" (86 mm)
Sheave Diameter
57 mm
Ratchet
Non Ratcheting
Integral Cleat
No Integral Cleat
Becket
No Becket
Ball Bearing
Torlon
Mount Type
Fixed Lashing Eye
Safe Working Load
2500 Pounds
Direction
Any
Weight
4.4 Ounces
Type
Single Runner
Length
3 3/8 Inches
Diameter
1/2 Inch or 13 mm
Product Overview
Harken 57mm Black Magic Air Runner Block allows adjustments and tuning of mast bends for different wind conditions. 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.