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The ALLEN quad block with ball-bearing 50mm sheave and swivel shackle is the ideal solution for professional sailing applications with high gear ratios. Made from high-quality materials with ball-bearing technology, this quad block offers maximum reliability and durability. Available in two versions: with swivel shackle or with swivel shackle and dogtail.
Ideal for sailboats, yachts, and demanding marine applications. The ball-bearing design ensures smooth operation with minimal friction, while the swivel shackle provides flexible attachment and prevents twisting. With a breaking strength of 950 kg and a maximum continuous load (MDL) of 470 kg, suitable for rope diameters up to 10 mm, this quadruple block is perfect for high-ratio applications on board.
| Item No. | type | Length (mm) | Weight (g) | BRL (kg) | MDL (kg) |
|---|---|---|---|---|---|
| HA2056 | with swivel shackle | 100 mm | 290.0 g | 950 kg | 470 kg |
| HA2057 | with vertebral shackle and dog's tail | 136 mm | 300.0 g | 950 kg | 470 kg |
Technical specifications: Manufacturer ALLEN, pulleys Ø 50mm, ball bearing, quad block, with swivel shackle, for rope Ø up to 10mm, breaking load 950kg, MDL 470kg.
Applications: Ideal for sailboats, yachts, and professional marine applications where high gear ratios are required. Perfect for halyards, sheets, vangs, and versatile deck applications, offering maximum power savings thanks to the pulley system. The swivel shackle ensures flexible attachment and prevents twisting. The ball-bearing construction guarantees smooth operation with minimal friction. The version with a dogtail offers additional attachment options. Trust ALLEN quality for professional sailing solutions.