Harken 75mm Black Magic Air Blocks
HAR-3231
Sheave Diameter: 75mm
Caged Torlon® Roller Bearings - maintaining separation and parallel alignment to minimise friction
Captive Delrin® ball bearings carry any side-loading
Hard-lube anodised 6061-T6 aluminium sculpted side plates and sheaves
Triple Function Set Screw Shackle Head
Black Magic Air Blocks are powerful performers suited to hard-working sail controls
More Information
Features
Harken Black Magic Air blocks are lightweight, free-running, powerful performers ideally suited to hard-working sail controls, e.g. mainsheet, runners, halyards or Spinnaker systems sheets and guys.
Harken 75mm Black Magic Air Blocks: Facts, Features and Plus Factors
- Sheave Diameter: 45mm
- Low-friction efficiency for fast, accurate trim and release
- The Centre cage keeps the Torlon® roller bearings separated and parallel to reduce friction.
- Captive Delrin® ball bearings carry side loads
- High-strength, lightweight aluminium sheaves and side plates, CNC sculpted for optimum load capacity to weight ratio
- Excellent durability: sun and salt-resistant
- Smooth finish, hard-lube anodised 6061-T6 aluminium side plates, and sheaves deliver maximum UV protection
- Dissimilar metals are isolated to prevent corrosion caused by galvanic reaction
- Triple Function three-way Set Screw Shackle Head
- Shackle Head options: 360-degree swivel rotation to alleviate rope twist, fixed in line or fixed at 90 degrees
- Soft-Attach options: patented loop or lash through the middle of the sheave instead of the head.
- The primary load is carried by the centre of the sheave for weight efficiency and compactness
- Patented Soft-Attach Loop blocks: removable dead-end post for attachment to a pad eye
- Easy maintenance: quick disassembly with a hex spanner - minimum fastenings with no loose balls or rollers
| Harken | Sheave Ø | Block Configuration | MBL | MWL | Maximum Line Ø | Weight |
|---|---|---|---|---|---|---|
| 3231 | 75mm | Single, swivel | 4536kg | 2268kg | 14mm | 325g |
| 3232 | 75mm | Single, swivel, becket | 4536kg | 2268kg | 14mm | 351g |
| 3233 | 75mm | Double, swivel | 6804kg | 3402kg | 14mm | 728g |
| 3244 | 75mm | Stand-up | 4536kg | 2268kg | 14mm | 440kg |
| 3241 | 75mm | Spriddle, swivel | 4536kg | 2268kg | 14mm | 452g |
| 3242 | 75mm | Spriddle, swivel, becket | 4536kg | 2268kg | 14mm | 476g |
| 3243 | 75mm | Single, swivel, low-load | 2722kg | 1361kg | 14mm | 325g |
| 3230 | 75mm | Single, Loop | 4536kg | 2268kg | 14mm | 206g |
Harken 75mm Black Magic Carbo Air Spriddles
A Spriddle is similar to a Fiddle block, which has two sheaves in line, one primary and one secondary sheave - but with the difference that the sheaves on a Spriddle are both primary with a similar load capacity, often used for spinnaker changes and peels.
MBL = Harken Manufacturer Break Load
MWL = Harken Maximum Working Load
Ø = diameter
- Block Size - 75 mm
