3243
75mm Low Load Block
Black Magic Air blocks are a top favorite of Big Boat performance racers and cruisers. These lightweight, free-running, powerful performers are used for sail controls that see lots of action: mainsheet, runner, halyard, and spinnaker systems. A center cage keeps Torlon® roller bearings separated and parallel to reduce friction. Shackle blocks lock in two directions or swivel to keep line from twisting.
The low-load block has a red isolator. It uses Delrin® ball bearings, with a 17-4 PH stainless headpost and 316 stainless steel shackles.
Torlon is a registered trademark of Solvay Advanced Polymers L.L.C.
Technical specifications · Harken 3243
| Sheave diameter | 75 mm |
|---|---|
| Length | 129 mm |
| Weight | 335 g |
| Shackle pin diameter | 8 mm |
| Maximum line diameter | 14 mm |
| Maximum working load | 1361 kg |
| Breaking load | 2722 kg |
Attachment loops are supplied separately.