Description
Harken 57mm-150mm Black Magic Runner 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-anodized 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) |
|---|---|---|---|---|---|---|---|---|---|
| 3224 | 57 mm Black Magic Air Runner Block | 57 (2 1/4) | 86 (3 3/8) | 125 (4.42) | 12 (7/16) | 1134 (2500) | 2268 (5000) | 10 (3/8) | |
| 3238 | 75 mm Black Magic Air Runner Block | 75 (2 15/16) | 118 (4 5/8) | 288 (10.16) | 14 (9/16) | 2268 (5000) | 4536 (10000) | 12.7 (1/2) | |
| 3251 | 100 mm Black Magic Air Runner Block | 100 (3 15/16) | 157 (6 3/16) | 481 (17) | 16 (5/8) | 3402 (7500) | 6804 (15000) | 15.9 (5/8) | |
| 3259 | 125 mm Black Magic Air Runner Block | 125 (4 15/16) | 195 (7 11/16) | 183.5 (7 7/32) | 844 (29.76) | 19 (3/4) | 4990 (11000) | 9979 (22000) | 19 (3/4) |
| 3264 | 150 mm Black Magic Air Runner Block | 150 (5 15/16) | 221 (8 3/4) | 216 (8 1/2) | 1436 (50.64) | 25 (1) | 6804 (15000) | 13608 (30000) | 19 (3/4) |
