Stainless Steel D Shackle Bolt Type with Nut Cotter Pin for Webnet Heavy Lifting

Marine Grade 316 Stainless Steel D Shackle Bolt Type with Nut & Cotter Pin – For Webnet, Heavy Lifting & Marine Rigging

1. Product Description

The Marine Grade 316 Stainless Steel D Shackle Bolt Type with Nut & Cotter Pin is a premium, high-strength lifting and rigging component engineered for marine environments, webnet tensioning systems, heavy industry, and demanding lifting applications. Manufactured from marine grade 316 stainless steel via forging, this D‑shaped shackle offers superior corrosion resistance against saltwater, chlorides, and harsh coastal conditions, making it the preferred choice for marine and offshore use-.

The shackle features a bolt type pin secured with a nut and a cotter pin for double‑locking safety, effectively preventing accidental loosening under severe vibration, dynamic loads, and wave action. The D‑shape (straight-side/chain shackle) design is optimized for in‑line pulling where space is limited and load direction is controlled-. It is 100% load tested and available in imperial sizes from 3/16″ to 1″ (metric equivalents from 6.35 mm to 28.57 mm), with breaking loads ranging from 1,500 kg to 28,000 kg. The polished surface finish provides a smooth, rust‑resistant, professional appearance.

Fully customizable in size, length, width, packaging, logo, and surface finish. Free samples and small orders are supported, with door‑to‑door service available. Ideal for webnet systems (rockfall barriers, animal enclosures, facade safety nets), heavy lifting, marine rigging, towing, and industrial 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: 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)-.
• Design standard: Oversize anchor shackle, meets international lifting standards (EN 13889, ASME B30.26)-.
• Customization: Size, length, width, packaging, logo, surface finish, material.
• Applications: Marine rigging, webnet systems, heavy lifting, vehicle towing, cargo hoisting.

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-.

• Bolt type pin with nut and cotter pin – Double locking mechanism prevents accidental loosening under vibration, shock loads, and dynamic lifting. Provides enhanced security for critical applications.

• D‑shape design – Straight‑side/chain shackle geometry optimized for in‑line pulling where space is limited and load direction is controlled. Reliable straight‑pin configuration for secure connections-.

• High breaking load – Sizes from 3/16″ to 1″ with breaking loads from 1,500 kg to 28,000 kg, suitable for light to heavy 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, length, width, packaging, logo, and surface finish can be tailored.

• Free samples & small orders – Low MOQ for trials; flexible ordering.

• Wide applications – Marine rigging, webnet tensioning, heavy lifting, towing, construction, mining, and industrial equipment fixing.

4. Applications

The Marine Grade 316 Stainless Steel D Shackle is used in numerous demanding fields:

• Marine rigging & mooring – Anchor chain connections, dock line attachments, towing bridles, ship deck securing, yacht rigging, offshore platform lifting. Marine grade 316 stainless steel is built to withstand saltwater and extreme weather-.

• 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.

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

• 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.

• Mining – Conveyor belt splicing, bucket rigging, dragline attachments, safety line anchors.

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

5. Technical Principles

5.1 Material & Strength

Marine grade 316 stainless steel provides good tensile strength and excellent 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 D‑shape geometry minimizes stress concentration at the pin holes and distributes the load along the straight body, making it ideal for in‑line pulling-.

5.2 Safety Factor

Shackles are designed with a safety factor of 4:1 or 5:1 (breaking load / working load limit). Industrial‑grade shackles have a safety factor ≥4, and those for heavy hoisting ≥5-. For example, a shackle with a breaking load of 8,700 kg (1/2″) has a WLL of approximately 1,740–2,175 kg. Users must never exceed the WLL and must account for dynamic loads, angle of pull, and wear.

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 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-. Grade 316 is built to withstand extreme weather and marine environments-.

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