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