Swivel | eye-fork | A4 | M8255

Stainless steel A4/AISI 316 eye-jaw swivel is intended for use in applications where a rotation-free connection between wire rope, chain, or fiber rope is required. The product lacks an established standard and is used where a rotating function reduces torsion and wear under load. The AISI 316 design provides excellent resistance to corrosion in humid, salty, and chemically harsh environments, while maintaining high mechanical strength over time.

FIELD OF APPLICATION

The product is used in marine environments, sailboat rigging, dock installations, fishing equipment, and industrial lifting systems. It is intended for applications where rotation is required to prevent twisted lines and overload in attachments, for example when connecting wire rope and chain, and where the choice of material ensures reliable operation under continuous exposure to movement and corrosive environments.

TECHNICAL SPECIFICATIONS

Product type: Swivel
Product family: Eye-jaw
Material class: A4
Strength class: A4-80
Standard: M8252
Design: Eye-jaw with rotating function
Surface finish: Untreated
Environment: Marine
Delivery unit: Piece

FREQUENTLY ASKED QUESTIONS (FAQ)

What is the main function of an eye-jaw swivel combination?

A swivel is designed to allow free rotation between two connected components under load:

• Eliminates torsion and spinning: Prevents wire ropes, chains, anchor chains, and fiber ropes from twisting or knotting when under load or in motion.

• Reduces material wear: By absorbing torque (torsion), it prevents wire strands from unraveling or chain links from being subjected to harmful diagonal loads, which significantly extends the service life of the rigging and chain.

• Versatile connection (Eye/Jaw): The eye is easily attached to shackles, hooks, or connecting links, while the jaw (with a removable/secured bolt) allows the swivel to be connected directly to chain links, eye fittings, or wire rope thimbles without extra connecting links.

Why is acid-proof stainless steel A4 (AISI 316) crucial for swivels?

Swivels are often used in direct contact with water, sea salt, and heavy dynamic loads:

• Maximum corrosion protection: A4 steel (1.4401 / AISI 316) is alloyed with molybdenum and effectively prevents crevice and pitting corrosion (pitting) from continuous exposure to saltwater, spray, and aggressive chemicals.

• Ensures rotating function: In cheaper materials, rotating parts can rust shut and lose their swivel function, which directly leads to torsional damage to the rigging. A4 steel maintains its smooth and free rotation over time.

• High mechanical load-bearing capacity: Combines high corrosion resistance with excellent toughness to withstand jerky and dynamic tensile forces in harsh marine and industrial environments.

What should be considered when mounting and securing the jaw bolt?

1. Locking the jaw bolt: Always check that the jaw bolt/cotter pin or threaded locking pin is fully secured and tightened before loading so that the bolt does not unscrew due to vibrations or rotating movements.

2. Check load direction: Ensure that the swivel is loaded in a straight longitudinal direction. Avoid subjecting the swivel body to breaking forces or side loading against a sharp edge.

3. Applications: Ideal for anchor rigging (between anchor winch/chain and anchor), crane lifting, sheet and halyard systems on sailboats, buoy moorings, and industrial suspensions where rotational freedom is required.