Marine Insight: Anchor Shackles

Marine Industry Demand for Anchor Shackles: Critical Safety and Strategic Sourcing Value

Anchor shackles represent a fundamental yet critically stressed component within any vessel’s anchoring system. Their primary function – securely connecting the anchor to the anchor chain or rode – places them under immense cyclical loads during deployment, holding, and retrieval operations, especially in severe weather or emergency situations. A single point failure in an anchor shackle can lead to catastrophic consequences, including complete loss of the anchor and chain, vessel drifting uncontrollably, potential grounding, collision, or environmental damage. This inherent risk underscores why marine classification societies and international safety regulations, such as those from the International Maritime Organization (IMO) and International Association of Classification Societies (IACS), mandate rigorous design, material, and testing standards for these components. Vessel operators and shipowners prioritize shackles manufactured to exacting specifications, typically conforming to grades like Grade M2, M3, or R4/R4S as defined in standards such as ISO 2415 or EN 13889, ensuring sufficient strength, ductility, and fatigue resistance to withstand dynamic marine environments over extended service life. The non-negotiable requirement for absolute reliability makes the quality and certification of anchor shackles a paramount safety consideration, not merely a procurement cost item.

Sourcing high-integrity anchor shackles from Hangzhou Star Marine Technology Co., Ltd. delivers significant cost-effectiveness without compromising on safety or performance. Our strategic position within China’s advanced marine manufacturing ecosystem provides inherent advantages in material sourcing, production efficiency, and logistics. We operate state-of-the-art forging and heat treatment facilities dedicated to marine hardware, implementing stringent in-house quality control protocols that exceed basic classification society requirements. Every shackle undergoes 100% magnetic particle inspection (MPI) and full-scale proof load testing, with destructive testing conducted on sample batches per ASTM E4 or equivalent standards. Crucially, Star Marine holds valid Type Approval certificates from major classification societies including DNV, ABS, LR, and CCS, providing immediate assurance of compliance to global buyers. This integrated approach, combining robust Chinese manufacturing infrastructure with uncompromising adherence to international marine standards, translates directly into superior value. We achieve competitive pricing through optimized production volumes and supply chain management, while maintaining the highest quality benchmarks, ultimately reducing the total cost of ownership for our clients through enhanced reliability, extended service life, and minimized risk of costly operational failures or downtime.

The table below summarizes key technical and value drivers differentiating Star Marine’s anchor shackle offering:

Technical Requirement	Star Marine Implementation	Cost-Effectiveness Outcome
Material Grade Compliance	Forged from certified Grade M3/M4 steel; full traceability	Eliminates risk of substandard material failure
Proof Load Testing	100% tested to 2x WLL; documented test reports per shackle	Guarantees as-supplied strength; reduces QA costs
Non-Destructive Testing (NDT)	100% MPI on critical areas; automated inspection systems	Ensures defect-free product; prevents in-service failure
Certification	Valid DNV, ABS, LR, CCS Type Approvals; ISO 9001 certified	Streamlines vessel certification; avoids delays
Production Scale & Logistics	Integrated Chinese manufacturing hub; efficient global shipping	Competitive landed cost; reliable delivery schedules

Partnering with Hangzhou Star Marine Technology ensures access to anchor shackles that meet the maritime industry’s uncompromising safety demands while delivering demonstrable economic advantages through certified quality, operational reliability, and optimized procurement value. This combination is essential for prudent fleet management and regulatory compliance in today’s demanding maritime operational landscape.

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Technical Specs & Approval

Anchor shackles are critical components within marine anchoring systems, serving as the primary connecting link between the anchor and the anchor chain. At Hangzhou Star Marine Technology Co., Ltd., we manufacture high-integrity anchor shackles designed to meet international maritime standards, ensuring reliability, durability, and optimal performance under extreme marine conditions. Our anchor shackles are precision-forged from high-strength alloy steel and undergo rigorous quality control to comply with classification society requirements including ABS, DNV, LR, CCS, and others.

The mechanical performance of an anchor shackle is primarily determined by its grade designation, which reflects the material strength and allowable working stresses. We offer anchor shackles in both Grade U2 and Grade U3, with U3 providing enhanced mechanical properties suitable for demanding offshore and deep-water anchoring applications. The selection between U2 and U3 depends on the vessel’s size, operational profile, and environmental loading conditions. Each shackle is permanently marked with its grade, size, heat number, and certification body for full traceability.

Weight is a key parameter in system integration, influencing handling, stowage, and overall anchor assembly balance. Our shackles are engineered to provide maximum strength-to-weight efficiency, minimizing unnecessary mass without compromising structural integrity. Holding power, expressed as the minimum breaking load (MBL), is directly correlated to shackle grade and nominal diameter. All products are proof load tested at 2 times the maximum working load and subjected to non-destructive examination (NDE) methods such as magnetic particle inspection (MPI) to detect surface discontinuities.

Surface finish plays an essential role in corrosion resistance and service life. Our standard anchor shackles feature a hot-dip galvanized coating, providing robust protection against saltwater corrosion. Custom surface treatments such as Dacromet or Xylan coatings are available upon request for extended durability in aggressive environments. All shackles are designed with a bow-type configuration to accommodate angular misalignment and reduce stress concentration during deployment.

Below are the technical parameters for standard anchor shackle models produced by Hangzhou Star Marine Technology:

Nominal Diameter (mm)	Grade	Weight per Piece (kg)	Proof Load (kN)	Minimum Breaking Load (kN)	Surface Treatment
22	U2	2.8	470	940	Hot-Dip Galvanized
25	U2	3.6	600	1200	Hot-Dip Galvanized
28	U3	4.5	750	1500	Hot-Dip Galvanized
32	U3	6.2	980	1960	Hot-Dip Galvanized
38	U3	9.1	1400	2800	Hot-Dip Galvanized
44	U3	13.0	1900	3800	Hot-Dip Galvanized
50	U3	18.5	2500	5000	Hot-Dip Galvanized

All dimensions and performance values conform to ISO 2415 and EN 13821 standards. Custom sizes and configurations are available for specialized vessel designs or offshore mooring systems. Each shackle is supplied with full material test certificates and third-party inspection reports as required.

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Shipbuilding Solutions

Hangzhou Star Marine Technology: Anchor Shackle Solutions for Shipbuilding & Repair

Hangzhou Star Marine Technology Co., Ltd. delivers certified anchor shackles and integrated anchoring solutions tailored for new vessel construction and critical repair projects. As a trusted marine equipment engineer and export partner, we understand that shipyards and repair facilities require precision-engineered components with zero compromise on safety, compliance, and delivery speed. Our anchor shackles adhere strictly to ISO 2415, DNVGL-RU-SHIP Pt.3 Ch.5, and ABS A-141 standards, ensuring seamless integration into global shipbuilding programs and emergency repair workflows.

Our value lies in eliminating procurement bottlenecks. For new builds, we collaborate with naval architects during design phases to supply shackles matching vessel-specific anchor handling systems, including customized dimensions for high-tensile steel (HTS) or galvanized carbon steel variants. During repairs, our 24-hour technical response team verifies shackle specifications against vessel class records, enabling immediate replacement without dry-dock delays. We maintain strategic inventory hubs in Shanghai and Singapore, guaranteeing 72-hour delivery of common sizes to major Asian shipyards and 10-day global air freight for urgent cases. All products undergo 100% magnetic particle inspection (MPI) and proof-load testing, with full traceability via mill test certificates and class society documentation.

Technical Specifications & Compliance

Parameter	Standard Specification	Star Marine Enhancement	Class Approval
Material Grade	M2, M3 (ISO 2415)	Optional M4 for ultra-deepwater rigs	ABS, LR, DNV, BV, NK
Proof Load Test	2.5 x WLL	3.0 x WLL (exceeding ISO minimum)	Certified test reports
Finish	Hot-dip galvanized	Epoxy-coated for acidic environments	DNVGL-CG-019 compliant
Traceability	Batch-level	Individual serial-numbered	Full digital log

Beyond component supply, we provide engineered solutions: load analysis for shackle-anchor chain compatibility, corrosion-resistant coating recommendations for harsh marine environments, and on-site technical support during installation. Our export team manages all regulatory hurdles—including USML, EU REACH, and China Customs HS Code 7316.00—ensuring frictionless global shipment. For repair projects, we offer reverse-engineering services to replicate obsolete shackle designs using original vessel blueprints, preventing costly redesigns.

Partnering with Star Marine transforms anchoring system procurement from a logistical challenge into a strategic advantage. We secure your project timeline with certified reliability, rapid response, and uncompromised quality—proven across 200+ vessels annually. Contact our export desk for a vessel-specific shackle solution within 24 hours.

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Packaging & Logistics

Packaging & Logistics for Anchor Shackles – Export Guidelines

At Hangzhou Star Marine Technology Co., Ltd., we ensure that all anchor shackles are packaged to meet international maritime shipping standards, safeguarding product integrity during transit. As a critical component in anchoring systems, anchor shackles are subject to rigorous handling, environmental exposure, and long-distance transportation. Our packaging protocols are designed to provide maximum protection while complying with global phytosanitary and logistical requirements.

All wooden packaging materials used in the export of anchor shackles conform to ISPM 15 (International Standards for Phytosanitary Measures No. 15). This internationally recognized standard mandates that wooden packaging be heat-treated and officially marked to prevent the spread of pests and diseases through international trade. Our wooden cases are constructed from durable, kiln-dried hardwood or plywood, reinforced at stress points to withstand stacking and rough handling. Each case is secured with corrosion-resistant metal strapping and features internal bracing to immobilize the shackles, minimizing movement during shipment. The ISPM 15 compliance stamp is clearly visible on each wooden component, ensuring smooth customs clearance in all major markets, including the European Union, North America, and Australia.

For heavier or bulk shipments, we utilize custom-fabricated steel pallets. These pallets are designed to support high-load capacities and are ideal for containerized shipping or roll-on/roll-off (Ro-Ro) operations. Steel pallets offer superior resistance to moisture, impact, and deformation, making them especially suitable for marine environments and extended ocean voyages. Each pallet is welded for structural integrity and treated with a protective coating to prevent rust during transit. Shackles are securely fastened using high-tensile steel straps or locking mechanisms, ensuring zero displacement.

Our primary export hubs are the ports of Ningbo and Shanghai, two of the busiest and most efficient container ports in the world. Both locations offer direct access to major global shipping lanes, ensuring timely delivery to destinations across Europe, the Americas, Southeast Asia, and the Middle East. We coordinate with certified freight forwarders to manage documentation, customs brokerage, and multimodal transport logistics. All shipments are accompanied by a full suite of export documentation, including commercial invoices, packing lists, certificates of origin, and, when required, material test certificates (MTC) for the shackles.

The following table outlines our standard packaging configurations based on product volume and export destination:

Shipment Type	Packaging Method	Load Capacity (per unit)	ISPM 15 Compliant	Export Port
Small Batch	Wooden Case	50–200 kg	Yes	Ningbo / Shanghai
Medium Batch	Reinforced Wooden Crate	200–500 kg	Yes	Ningbo / Shanghai
Large / Bulk Order	Steel Pallet	500–2000 kg	N/A (Metal)	Ningbo / Shanghai
Project Cargo	Custom Steel Frame	>2000 kg	N/A (Metal)	Ningbo / Shanghai

Hangzhou Star Marine Technology maintains strict internal quality control throughout the packaging process, ensuring every shipment meets both customer expectations and international regulatory standards. This structured approach to packaging and logistics underscores our commitment to reliability, safety, and on-time delivery in the global marine equipment market.

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Contact Star Marine

Contact Star Marine for Precision Anchor Shackle Solutions

Selecting the optimal anchor shackle is not merely a procurement decision; it is a fundamental commitment to vessel safety, operational continuity, and regulatory compliance. In the demanding marine environment, where tensile stress, corrosion, and dynamic loads are constant factors, the integrity of your anchoring system hinges on components engineered to exacting global standards. Hangzhou Star Marine Technology Co., Ltd. stands as your dedicated partner, providing anchor shackles that exceed the rigorous demands of modern maritime operations. Our commitment extends beyond manufacturing to encompass comprehensive technical support and export expertise, ensuring seamless integration of our products into your global supply chain.

Our anchor shackles are precision-forged from premium marine-grade alloy steels, subjected to stringent heat treatment processes, and meticulously tested to validate performance under extreme conditions. Every unit undergoes 100% magnetic particle inspection (MPI) and ultrasonic testing (UT) to eliminate internal and surface defects. We adhere strictly to international classification society requirements, including DNV, ABS, LR, BV, and CCS, with full traceability from raw material to finished product. This unwavering focus on quality control and material science ensures shackles deliver the required Working Load Limit (WLL) with a significant safety margin, directly contributing to the safety of crew, vessel, and cargo during critical anchoring maneuvers.

Understanding the complexities of international maritime procurement, Hangzhou Star Marine Technology provides tailored export solutions. We navigate intricate documentation, customs regulations, and logistics for seamless global delivery, whether your requirement is for standard ISO-compliant shackles or custom-engineered solutions for specialized offshore applications. Our technical export team possesses deep expertise in maritime standards and shipping documentation, ensuring your order arrives compliant, on time, and ready for immediate deployment. The table below summarizes key specifications for our standard anchor shackle range, reflecting our adherence to global benchmarks.

Product Type	Material Grade	Proof Load (2x WLL)	Minimum Breaking Load (4x WLL)	Key Certifications
Anchor Shackle (D)	M400 / R5	As per ISO 17081	As per ISO 17081	DNV-GL, ABS, LR, BV, CCS, ISO 17081
Anchor Shackle (Bow)	M400 / R5	As per ISO 17081	As per ISO 17081	DNV-GL, ABS, LR, BV, CCS, ISO 17081
Custom Forged	M690 / R6	Customer Specific	Customer Specific	Full Class Approval Package

For immediate technical consultation, detailed quotation requests, or to discuss bespoke anchoring system requirements, direct engagement with our Product Management team is essential. Kacher YE, our dedicated Product Manager for Anchoring Equipment, possesses extensive technical knowledge of marine shackle design, material specifications, and global export protocols. Mr. YE specializes in translating complex vessel specifications into precise component solutions, ensuring optimal performance and regulatory alignment for your specific operational profile. He is your single point of contact for navigating technical inquiries, certification documentation, and expediting order fulfillment within tight project timelines.

Do not compromise on the critical link between your vessel and the seabed. Contact Kacher YE today to leverage Hangzhou Star Marine Technology’s engineering excellence and export proficiency. Provide your vessel particulars, required shackle specifications, and project timeline for a prompt, technically robust response. Reach Kacher YE directly via email at [email protected]. Our team is prepared to respond within 24 business hours to initiate the process of securing the highest integrity anchor shackles for your fleet, backed by our global service commitment and rigorous quality assurance framework. Partner with Star Marine for anchoring reliability you can trust, anywhere in the world.

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