Marine Grade 316 SS Polished Twisted Shackle For Heavy Industry Lifting & Secure Rigging

Marine Grade 316 SS Polished Twisted Shackle for Heavy Industry Lifting & Secure Rigging & Webnet

1. Product Description

The Marine Grade 316 SS Polished Twisted Shackle is a high-strength, corrosion-resistant lifting and rigging component engineered for heavy industry lifting, marine vessel rigging, and webnet (safety net) tensioning systems. Manufactured from premium marine grade 316 stainless steel with a polished finish, this twisted shackle delivers exceptional resistance to saltwater, chlorides, and harsh marine environments.

The shackle features a unique 90-degree twisted body design that sets the pin perpendicular to the top of the loop. This allows angled connections in rigging, mooring, and deck hardware applications where space is restricted or alignment is critical. The twist prevents side-loading on the shackle pin, ensuring a stronger and more stable attachment point than standard straight shackles.

Available in metric sizes from 4 mm to 12 mm (and imperial equivalents), with breaking loads ranging from 665 kg to 6,000 kg based on the provided specification table-. The polished surface finish provides a smooth, rust-resistant, professional appearance.

Fully customizable in size, diameter, length, width, packaging, logo, and surface finish. Free samples are supported, with door-to-door service available. Ideal for heavy lifting, marine rigging, webnet systems (rockfall barriers, animal enclosures, facade safety nets), yacht mooring, and secure rigging applications.

2.Product Attributes

Additional Specifications:

• Material: Marine grade 316 stainless steel (A4). 304 stainless steel also available on request.

• Surface finish: Polished (bright). Other finishes (passivated, electro-polished) available.

• Pin type: Collar pin (standard)-; screw pin, self-locking pin, or captive pin options available.

• Working load limit (WLL): Typically 1/4 to 1/5 of breaking load (safety factor 4:1 or 5:1).

• Design standard: Twisted shackle, meets international lifting and rigging standards.

3. Key Features

• Marine grade 316 stainless steel construction – Superior corrosion resistance for saltwater, coastal, and marine environments.Forged construction provides outstanding working and breaking loads as well as fatigue resistance.

• 90-degree twisted body design – Allows angled connections where space is restricted or alignment is critical. The twist sets the pin perpendicular to the top of the loop and prevents side-loading on the pin, ensuring a stronger and more stable attachment point.

• Multiple pin options – Available with collar pin, screw pin, self-locking pin, or captive pin. Self-locking pin resists loosening caused by vibration.

• High breaking load – Sizes from 4 mm to 12 mm with breaking loads from 665 kg to 6,000 kg, suitable for light to medium lifting and rigging.

• 100% load tested – Each shackle is proof-tested to its rated breaking load, ensuring safety and reliability.

• Polished surface finish – Smooth, rust-resistant, professional appearance; reduces crevices and makes cleaning easier.

• Fully customizable – Size, diameter, length, width, packaging, logo, and surface finish can be tailored.

• Free samples – Available for quality verification before bulk order.

• Wide applications – Heavy industry lifting, marine vessel rigging, webnet tensioning, yacht mooring, boat lifting, sailing hardware, and secure rigging.

4. Applications

The Marine Grade 316 SS Polished Twisted Shackle is used in numerous demanding fields:

• Heavy industry lifting – Overhead crane lifting, steel mill slings, heavy equipment maintenance, industrial hoisting.

• Marine vessel rigging – Ship mooring lines, anchor chain connections, dock line attachments, towing bridles, yacht rigging, offshore platform lifting.

• Webnet (safety net) systems – Tensioning and connecting stainless steel wire rope nets (webnets) for rockfall barriers, animal enclosures (zoos, aviaries), building facade safety nets, sports barriers, and fall arrest systems.

• Yacht mooring & boat lifting – Dock line connections, anchor chain attachment, cleat securing, sling hooks, davit connections, dry dock hoisting.

• Sailing hardware – Sheet blocks, halyard tie-offs, mast rigging, sailboat rigging.

• Shade structures & tension membranes – Connecting outdoor fabric to support structures for hip and ridge or tension membrane sun shades.

• General engineering – Machinery fixing, agricultural equipment, stage rigging, cargo securing.

5. Technical Principles

5.1 Material & Forging

Marine grade 316 stainless steel provides excellent tensile strength and corrosion resistance in marine and industrial environments-. The molybdenum content in Grade 316 delivers better overall corrosion resistance than Grade 304, particularly against chlorides in saltwater-. Drop forging aligns the grain structure, eliminating internal voids and maximizing strength and fatigue resistance.

5.2 Twisted Design & Load Distribution

The unique 90-degree twisted body allows the shackle pin to sit perpendicular to the attachment point.This configuration is particularly useful when connecting components that are offset or rotated.The twist minimizes lateral stress and ensures a more even distribution of load forces  preventing side-loading on the pin.

5.3 Safety Factor

Shackles are designed with a safety factor of 4:1 or 5:1 (breaking load / working load limit). For example, a shackle with a breaking load of 2,800 kg (8 mm) has a WLL of approximately 560–700 kg. Users must never exceed the WLL and must account for dynamic loads, angle of pull, and wear.

5.4 Pin Locking Mechanisms

• Collar pin – Standard quick-release pin with collar for secure retention-.

• Screw pin – Threaded pin for secure fastening with tools.

• Self-locking pin – Locking mechanism resists loosening caused by vibration.

• Captive pin – Pin remains attached to the shackle body, preventing loss.

5.5 Corrosion Resistance

316 stainless steel forms a passive chromium oxide layer that protects against rust-. The polished surface reduces crevices and makes cleaning easier. For saltwater environments, Grade 316 is the minimum standard for marine use-.

5.6 Load Testing & Traceability

Each shackle is proof-loaded to 100% of its rated breaking load. Permanent markings (size, grade, and sometimes load rating) are stamped on the body for traceability and compliance with international standards.

Company Profile- anping county huihao wire mesh manufacture co.,ltd Huihao mainly produce: metal rings mesh, insulation fasteners, decoration metal mesh.

Huihao services include : pattern design frame design installation system design surface finished Mould customization