Marine Grade 316 SS Polished Long D Shackle Locking Screw Pin For Heavy Industry

Product Specification

Marine Grade 316 SS Polished Long D Shackle Locking Screw Pin – For Heavy Industry Lifting, Marine Vessel Rigging & Webnet

1. Product Description

The Marine Grade 316 SS Polished Long D Shackle Locking Screw Pin 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 long D‑shape shackle delivers exceptional resistance to saltwater, chlorides, and harsh marine environments, making it the preferred choice for offshore, coastal, and demanding industrial applications.

The shackle features a locking screw pin for secure fastening, preventing accidental loosening under vibration and dynamic loads. The long D‑shape (extended body) design provides additional clearance for chain links, rope eyes, or webnet edge rings, allowing easier attachment in confined spaces. It is 100% load tested and available in metric sizes from 4 mm to 12 mm, with breaking loads ranging from 500 kg to 5,400 kg. 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 industry lifting, marine vessel rigging, webnet systems (rockfall barriers, animal enclosures, facade safety nets), yacht mooring, boat lifting, and sailing hardware.

2.Product Attributes

Additional Specifications:

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

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

• Pin type: Locking screw pin (threaded). Also available with safety bolt pin.

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

• Design standard: Long D shackle with locking pin, meets international lifting standards.

3. Key Features

• Marine grade 316 stainless steel construction – Superior corrosion resistance for saltwater, coastal, and marine environments. Grade 316 contains molybdenum, delivering better overall corrosion resistance than Grade 304.

• Locking screw pin design – Threaded pin with locking mechanism prevents accidental loosening under vibration and dynamic loads, ensuring secure connections.

• Long D‑shape design – Extended body provides additional clearance for chain links, rope eyes, or webnet edge rings, allowing easier attachment in confined spaces.

• High breaking load – Sizes from 4 mm to 12 mm with breaking loads from 500 kg to 5,400 kg, suitable for light to medium lifting.

• 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 industrial equipment fixing.

4. Applications

The Marine Grade 316 SS Polished Long D 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.

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

5. Technical Principles

5.1 Material & Strength

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. The long D‑shape geometry minimizes stress concentration at the pin holes and provides additional clearance for easier attachment.

5.2 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 2,500 kg (8 mm) has a WLL of approximately 500–625 kg. Users must never exceed the WLL and must account for dynamic loads, angle of pull, and wear.

5.3 Locking Screw Pin Mechanism

The locking screw pin is threaded and inserted through the shackle ears and the attached component, then tightened securely. The locking mechanism (often a spring-loaded detent or secondary locking feature) prevents the pin from loosening or backing out under vibration, making it ideal for dynamic applications where standard pins might loosen.

5.4 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.

5.5 Load Testing & Traceability

Each shackle is proof‑loaded to 100% of its rated breaking load. Permanent markings (size and grade) 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