Forged and Cast Steel Anchor Chain Accessories for Marine Anchoring and Offshore

Product Specification

Forged and Cast Steel Anchor Chain Accessories for Marine Anchoring and Offshore Mooring Systems

Product Overview

This product range covers steel anchor chain accessories used to connect, terminate, swivel, enlarge, or adapt chain assemblies in ship anchoring and offshore mooring systems. Available items include Kenter shackles, joining shackles, end shackles, swivels, swivel shackles, buoy shackles, swivel groups, plates, common links, enlarged links, end links, and project-specific connecting components.

The accessories are supplied through qualified anchor-chain manufacturing partners rather than presented as in-house manufactured products. Selection is based on the nominal chain diameter, chain grade, mating link geometry, proof and breaking load requirements, pin arrangement, material route, heat treatment, inspection scope, and classification documentation. Stock availability may support urgent ship-repair or replacement enquiries, but the actual item, grade, dimensions, markings, and certificate batch must be confirmed before quotation.

Available Accessory Types

Kenter shackle | Joining shackle | End shackle | Swivel | Swivel shackle | C-shaped connecting shackle | Slim Kenter shackle | Forelock shackle | Pear-shaped shackle | Buoy shackle | Swivel group | Triangle plate | Round link | Common link | End link | Enlarged link | Studless link | Special-shaped connecting link

Quick Specifications

•  Product category: Anchor chain and mooring chain accessories → used to complete or replace chain assemblies, not as general lifting hardware.
•  Nominal diameter range: 12.5–162 mm as a supply range → final availability depends on accessory type, grade, manufacturer approval, and stock status.
•  Material routes: forged steel, cast steel, or rolled-bar construction → the permitted process depends on the accessory design and applicable class rule.
•  Marine anchor-chain grades: U2 / U3 stated in the supplied information → exact class designation and certificate scope must be confirmed for each item.
•  Offshore mooring grades: R3 / R3S / R4 stated as available → offshore grades require separate approved manufacturing, heat treatment, testing, and traceability.
•  Surface protection: black painted or hot-dip galvanized → coating selection should consider chain service, dimensional fit, inspection sequence, and project specification.
•  Detailed buoy-shackle range: nominal chain diameter 38–90 mm → supplied reference table includes Grade M2 / M3 test loads and Type A / Type B weights.
•  Supply and documentation: stock or project order → maker, material, test, NDE, and class documentation are available only according to confirmed order scope.

Main Technical Parameters

Selection & Inquiry Guide

Step 1: Identify the exact accessory: Kenter shackle, end shackle, swivel, swivel group, buoy shackle, enlarged link, or other connection item.

Step 2: Confirm nominal chain diameter, chain construction, grade, applicable standard or class rule, and the matching dimensions of the adjacent chain links.

Step 3: Provide the required proof load, breaking load, or certified test basis. Do not substitute SWL, proof load, or MBL for one another.

Step 4: Confirm forged, cast, or rolled-bar construction; heat-treatment condition; pin and locking arrangement; and any restriction on weld repair.

Step 5: Confirm surface finish, marking, NDE, dimensional report, material traceability, maker certificate, and class witnessing before quotation.

Step 6: Provide quantity, required delivery time, destination, stock-replacement urgency, vessel or offshore unit type, and drawing or clear photos of the existing part.

Structure

Forged or cast steel body | Pin / bolt and locking arrangement where applicable | Chain-compatible bearing surfaces | Heat-treated load path | Permanent identification and traceability marking | Black painted or specified galvanized finish

Material, Manufacturing & Inspection Advantages

• Accessory geometry is matched to the connecting chain, because nominal diameter alone does not confirm fit between a shackle, swivel, end link, enlarged link, and adjoining chain cable.
• Forged accessories provide a wrought load path when the approved design and material route specify forging; cast or rolled-bar alternatives are supplied only where permitted by the applicable design and approval.
• Heat treatment is selected by grade and manufacturing route and is completed before the specified proof, breaking, mechanical, and inspection stages.
• For classed supply, material identification, heat number, grade marking, and test documentation should remain traceable from approved material to the finished accessory.
• Offshore R3 / R3S / R4 accessories are treated as a separate approval and qualification scope from conventional U2 / U3 ship anchor-chain accessories.
• Dimensional inspection should include pin diameter, mating openings, bearing surfaces, locking clearances, and the dimensions needed to connect with the existing chain assembly.
• Selected stock items can shorten repair lead time, subject to physical inspection, dimensional confirmation, grade verification, and certificate-batch availability.

Custom Attributes

• Supply Status: Sourced supply product → supplied through qualified anchor-chain manufacturing partners; the approved manufacturer is confirmed with the quotation.
• Product Range: Standard and special chain accessories → selection covers connection, termination, swivelling, enlargement, and buoy or mooring interfaces.
• Nominal Diameter: 12.5–162 mm supply range → the approved size range varies by accessory type, grade, and manufacturer.
• Marine Grade: U2 / U3 → use only when the specified ship anchor-chain grade and certificate are confirmed.
• Offshore Grade: R3 / R3S / R4 → requires offshore mooring-chain approval, controlled material, heat treatment, testing, and traceability.
• Material Route: Forged / cast / rolled steel → final route follows the accessory design, class requirements, and approved manufacturing process.
• Surface Finish: Black painted / hot-dip galvanized → final finish follows service environment and project specification.
• Certificate Scope: According to order requirement → class certificate, material records, testing, NDE, and marking are not assumed as standard inclusions.

How It Works

Required chain connection is identified → Accessory type, nominal diameter, grade, and mating geometry are matched → Pin, shackle, swivel, or connecting link is assembled into the chain system → Tensile load is transferred through the approved load path → Marking, inspection, testing, and documentation are completed according to the order scope

Applications

Ship anchor chain cable assemblies | Chain locker and bitter-end connections | Anchor-to-chain connection groups | Buoy and mooring connections | Offshore positional mooring systems | SPM and terminal chain assemblies | Newbuilding supply | Ship-repair and replacement spares

Certifications & Advantages

Certificates and survey witnessing can be arranged according to the selected accessory, grade, approved manufacturer, material traceability, test scope, and classification society requirements. Availability is subject to project review and should be confirmed before order.

Certification: CCS, NK, BV, ABS, DNV, LR, KR, IRS, RS, RINA, CRS, Makers Test Certificate.

Drawing & Photos

FAQ

Q1: Is nominal chain diameter enough to order an anchor chain accessory?

A1: No. The accessory type, chain grade, adjoining-link dimensions, pin arrangement, proof or breaking load basis, standard or approved drawing, and certificate requirement must also be confirmed.

Q2: Can a U2 or U3 ship anchor-chain accessory be substituted for an R3 or R4 offshore mooring accessory?

A2: Not automatically. Conventional ship anchor-chain grades and offshore mooring grades have different material, approval, heat-treatment, testing, fatigue, traceability, and documentation requirements. Substitution requires design and class approval.

Q3: What documents should be specified for a classed order?

A3: Depending on the order, request the approved manufacturer and product scope, material certificate, heat-treatment record, dimensional report, proof and breaking load records, mechanical tests, NDE reports, identification list, and class certificate or survey endorsement.