316/304 SS Custom Wide Body D Shackle Bolt Type With Nut & Cotter Pin Polished Marine Grade

Marine Grade 316/304 SS Custom Wide Body D Shackle Bolt Type with Nut & Cotter Pin Polished – For Mining, Heavy Industry Lifting & Webnet

1. Product Description

The Marine Grade 316/304 SS Custom Wide Body D Shackle Bolt Type with Nut & Cotter Pin Polished is a premium, high‑strength lifting and rigging component engineered for mining, heavy industry lifting, construction hoisting, webnet (safety net) tensioning, and demanding marine applications. Manufactured from marine grade 316 or 304 stainless steel via forging or precision casting, this D‑shaped shackle features a wide body design that significantly increases the contact area with chains, slings, ropes, or webnet edges, reducing stress concentration and providing superior load stability.

The shackle is equipped with a bolt type pin secured by a nut and a cotter pin for double‑locking safety, effectively preventing accidental loosening under severe vibration, shock loads, and dynamic lifting conditions-. This positive locking mechanism makes it particularly suitable for semi‑permanent or long‑term installations where pin security is critical-.

Available in 9 mm and 12 mm sizes (with custom sizes available upon request), with breaking loads of 2,800 kg and 4,000 kg respectively based on the provided specification table. The polished surface finish provides a smooth, rust‑resistant, professional appearance.

Fully customizable in material (304/316), diameter, length, packaging, logo, and surface finish. Free samples and small orders are supported, with door‑to‑door service available. Ideal for mining equipment lifting, heavy industrial rigging, webnet tensioning systems (rockfall barriers, animal enclosures, facade safety nets), and marine applications.

2.Product Attributes

Additional Specifications:

• Material: Marine grade 316 or 304 stainless steel (forged or precision cast). Custom materials on request.

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

• Pin type: Bolt type with nut and cotter pin. Also available with screw collar pin.

• Working load limit (WLL): Typically 1/4 to 1/5 of breaking load (safety factor 4:1 or 5:1). For example, a 9 mm shackle with breaking load 2,800 kg has a WLL of approx. 560–700 kg. ASME B30.26 requires a minimum design factor of 5:1 (ultimate strength to WLL)-.

• Design standard: Wide body D shackle, meets international lifting standards (EN 13889 for forged steel shackles of grade 6-, ASME B30.26 for rigging hardware-).

3. Key Features

• Wide body D‑shape design – Increased contact area reduces stress concentration, providing superior load stability, robust strength, and versatility for heavy lifting, towing, and marine applications. The wide body keeps chain links from sliding or moving and supports heavier vertical loads-.

• Marine grade stainless steel (316/304) – Excellent corrosion resistance in saltwater, coastal, and industrial environments. Grade 316 contains molybdenum and nickel for superior resistance to salt water and chemical corrosion-. Stainless steel construction ensures durability and long‑term reliability. Choose 316 for maximum protection or 304 for cost‑effective performance.

• Bolt type pin with nut and cotter pin – Double locking mechanism prevents accidental loosening under vibration, shock loads, and dynamic lifting-. The pin won’t slide out with movement, ensuring safe and reliable operation-. Also known as bolt‑type shackles, these are engineered for permanent or long‑term installations where vibration might otherwise loosen a standard screw pin-.

• High breaking load – Available in 9 mm and 12 mm sizes with breaking loads of 2,800 kg and 4,000 kg respectively. Ideal for heavy‑duty maritime, industrial, and mining lifting/rigging applications.

• 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 – Material, diameter, length, surface finish (polished, galvanized, etc.), packaging, logo, and color can be tailored to specific requirements. Fits various application needs.

• Free samples & small orders accepted – Test quality before bulk purchase with flexible minimum order quantity, suitable for project trials or urgent needs.

• Wide applications – Mining equipment lifting, heavy industry rigging, webnet tensioning, yacht mooring, ship lifting slings, rigging fastening, offshore platform equipment, towing lines, cargo lashing, industrial hoisting, and general heavy‑duty maritime use.

4. Applications

The Marine Grade 316/304 SS Wide Body D Shackle is used in numerous demanding fields:

• Mining – Conveyor belt splicing, bucket rigging, dragline attachments, safety line anchors, ore car couplings, heavy equipment anchoring.

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

• 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.

• Marine rigging & mooring – Anchor chain connections, dock line attachments, towing bridles, ship deck securing, yacht rigging, offshore platform lifting.

• Towing & vehicle recovery – Tow straps, winch lines, recovery rings, truck lashing, trailer tie‑downs.

• Construction & hoisting – Steel beam lifting, concrete panel rigging, scaffolding ties, crane sling attachments.

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

5. Technical Principles

5.1 Material & Strength

316 stainless steel provides excellent tensile strength (approx. 515 MPa yield) and superior 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-. Grade 304 offers good general corrosion resistance with cost‑effective performance. The wide body D‑shape geometry minimizes stress concentration at the pin holes and provides increased contact area for improved load distribution.

5.2 Safety Factor

Shackles are designed with a safety factor of 4:1 or 5:1 (breaking load / working load limit). ASME B30.26 requires a minimum design factor of 5:1 (ultimate strength to WLL)-. For example, a shackle with a breaking load of 4,000 kg (12 mm) has a WLL of approximately 800–1,000 kg. Users must never exceed the WLL and must account for dynamic loads, angle of pull, and wear. Shackles should be visually inspected before each use in line with ASME B30.26 regulations-.

5.3 Nut and Cotter Pin Locking

The bolt type pin is inserted through the shackle ears and the attached component, then secured with a nut. A cotter pin is inserted through a hole in the bolt end and bent to lock the nut in place-. This double locking prevents the pin from loosening or backing out under severe vibration, making it ideal for heavy‑duty and dynamic applications where standard pins might loosen-. The bolt, nut, and stainless steel cotter pin mechanism ensures the shackle remains secure even under dynamic rotation or vibration-.

5.4 Corrosion Resistance

Stainless steel (304/316) forms a passive chromium oxide layer that protects against rust. The polished surface reduces crevices and makes cleaning easier. For saltwater or high‑chloride environments, Grade 316 is recommended for extended service life-. The wide body design also means more surface area for corrosion protection, enhancing overall durability.

5.5 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 (EN 13889-, ASME B30.26-).

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