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Turnbuckles and tensioners are essential components for tensioning, adjusting and securing cables, shrouds, guardrails, lifelines and other elements on board.

⛓️ NAUTICAL TURNING HOOKS

Turnbuckles are mechanical devices used to adjust the tension of cables and shrouds , especially on sailboats.

✅ Where are they used?
  • Shrouds and mast stays
  • Lifelines (safety cables on the sides)
  • Lifeline for safety harnesses
  • Also on awnings or tubular structures
🔧 Types of turnbuckles
  • Eye/Eye Two ring ends -> Light shrouds
  • Eye/Fork A forked end with a pin -> Lifeline
  • Fork/Fork Two forks with pins -> Main shrouds, rigid structures
  • Right/left thread Fine adjustment without disassembly -> All types
📐 Materials
  • AISI 316 stainless steel : salt-resistant and durable
  • Some models in chromed bronze or zinc/aluminium (less common)
⚠️ Important note
  1. Always lock the turnbuckle with safety nuts or cotter pins
  2. Some models have plastic covering or heat shrink sleeve to prevent abrasions and jamming
🔩 TENSIONERS

Turnbuckles are similar to turnbuckles, but often simpler and used for:

  • Awnings, covers, tarpaulins
  • Quick-fix points (less structurally critical)
  • Nets, elastic ropes, light cables

They are generally:

  • More compact and maneuverable
  • With hook/eye , hook/hook , or carabiner structure
  • Used where high loads are not required
🔧 Practical advice
  1. If you use shroud turnbuckles: ✔️ correct sizing and ✔️ certified tightness
  2. For lifelines: choose fork turnbuckles and flexible stainless steel cable
  3. For awnings: technical plastic or stainless steel hook/hook tensioners are also suitable