Mid range blocks robust construction makes them ideal to handle the high loads found on medium and large offshore boats. Sheave runs exclusively on a ball bearing system for fast trim and release under any load.
Note: DO NOT use Harken equipment for human suspension unless product is specifically certified and labelled for such use.
| Part Number | Sheave Diameter | Length | Shackle Pin Diameter | Max. Line Diameter | Max. Working Load | Breaking Load | Weight |
|---|---|---|---|---|---|---|---|
| HKN-1559 | 76mm | 216mm | 8mm | 14mm | 816kg | 2268kg | 482g |
![Schmitt Marine Heavy Duty Waterproof 2-Speed Wiper Motor – 3.5″ Shaft – 12V [33631]](https://www.sailorgearcorner.com/wp-content/uploads/2026/10/schmitt-marine-heavy-duty-waterproof-2-speed-wiper-motor-3-5-shaft-12v-33631.webp)
![Whitecap Door Hinge – 316 Stainless Steel – 1-1/2″ x 3″ [6028]](https://www.sailorgearcorner.com/wp-content/uploads/2026/10/whitecap-door-hinge-316-stainless-steel-1-1-2-x-3-6028.webp)
