Description
Harken 75-150mm Black Magic Runner Becket Blocks are used on running backstays of offshore boats to adjust mast bend for different wind conditions.
Integrated side-plate bails and recessed cotter key help produce a smooth design that won’t snag lifelines.
Side-plates and sheaves Hard Lube anodised for maximum UV protection and a smooth surface. Centre cage keeps Torlon® roller bearings separated and parallel to reduce friction.
Torlon is a registered trademark of Solvay Advanced Polymers L.L.C.
| Sku | Name | Sheave Ø mm (in) | Length mm (in) | Width mm (in) | Weight g (oz) | Maximum line Ø mm (in) | Maximum working load kg (lb) | Breaking load kg (lb) | Clevis pin Ø mm (in) |
|---|---|---|---|---|---|---|---|---|---|
| 3239 | 75 mm Black Magic Air Runner Block — Becket | 75 (2 15/16) | 146 (5 3/4) | 318 (11.2) | 14 (9/16) | 2268 (5000) | 4536 (10000) | 12.7 (1/2) | |
| 3252 | 100 mm Black Magic Air Runner Block — Becket | 100 (3 15/16) | 193 (7 9/16) | 542 (19.12) | 16 (5/8) | 3402 (7500) | 6804 (15000) | 15.9 (5/8) | |
| 3260 | 125 mm Black Magic Air Runner Block — Becket | 125 (4 15/16) | 240 (9 1/2) | 183.5 (7 7/32) | 950 (33.52) | 19 (3/4) | 4990 (11000) | 9979 (22000) | 19 (3/4) |
| 3265 | 150 mm Black Magic Air Runner Block — Becket | 150 (5 15/16) | 275 (10 13/16) | 216 (8 1/2) | 1608 (56.72) | 25 (1) | 6804 (15000) | 13608 (30000) | 19 (3/4) |
