Marine Insight: Danforth Anchor

The Danforth anchor is a critical component in marine anchoring systems, widely recognized for its high holding power relative to its weight. Designed with wide, flat flukes and a stock that allows the anchor to dig deeply into soft seabeds such as mud, sand, or clay, the Danforth anchor provides reliable performance in a variety of coastal and inland waterway conditions. Its lightweight yet robust design makes it ideal for small to medium-sized vessels, including recreational boats, fishing vessels, and auxiliary craft. The ability of the Danforth anchor to set quickly and maintain holding strength under variable wind and current conditions directly contributes to vessel safety, preventing drift and ensuring stable mooring. In emergency situations or adverse weather, a properly deployed Danforth anchor can be the difference between safe anchorage and potential grounding or collision.

Marine operators and fleet managers increasingly prioritize reliability and cost-efficiency in anchoring equipment procurement. Hangzhou Star Marine Technology Co., Ltd. meets these demands by manufacturing high-grade Danforth anchors that comply with international marine standards, including ISO 15773 and CCS certification. Our anchors are fabricated using high-tensile carbon steel, followed by hot-dip galvanization to ensure long-term corrosion resistance in harsh marine environments. Precision welding and rigorous load testing guarantee structural integrity, ensuring each anchor performs reliably under operational stress.

Sourcing Danforth anchors from Star Marine China offers significant cost advantages without compromising quality. As a vertically integrated manufacturer based in Hangzhou, we control the entire production cycle—from raw material sourcing to final inspection—enabling us to reduce overhead and pass savings to our global clients. Our strategic location in China’s industrial hub provides efficient access to major ports, reducing logistics costs and lead times. Additionally, our scalable production capacity allows for flexible order volumes, supporting both small distributors and large maritime supply chains.

The following table outlines key technical and commercial benefits of Star Marine’s Danforth anchor series:

Feature	Specification
Material	High-tensile carbon steel (ASTM A36)
Coating	Hot-dip galvanized (min. 245 µm coating thickness)
Standard Compliance	ISO 15773, CCS, CE
Holding Power Ratio	6:1 to 10:1 (depending on seabed)
Weight Range	5 kg to 200 kg
Fluke Angle	30° optimized for rapid seabed penetration
Production Lead Time	15–25 days (depending on order size)
Export Packaging	Wooden pallets with anti-rust film, seaworthy

By combining engineering precision with competitive pricing, Hangzhou Star Marine Technology has established itself as a trusted supplier in the global marine equipment market. Our Danforth anchors deliver consistent performance, enhancing vessel safety while offering procurement teams a cost-effective solution for reliable mooring systems.

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Technical Specs & Approval

Technical Specifications: Danforth Anchor

Hangzhou Star Marine Technology Co., Ltd. manufactures high-performance Danforth anchors engineered for reliable seabed penetration and holding power across diverse marine environments. Our stockless design features pivoting flukes that maximize grip in soft bottoms such as mud, sand, and silt, making it ideal for recreational vessels, workboats, and auxiliary anchoring systems. All units comply with ISO 18733:2015 standards for marine anchoring equipment, ensuring global regulatory acceptance and operational safety. Critical technical parameters are rigorously controlled during production to guarantee consistent performance under dynamic load conditions.

The following table details the core specifications for our standard Danforth anchor range. Dimensions and weights are nominal; actual values may vary within ISO tolerance limits. Holding power is determined through controlled testing in cohesive seabed material (shear strength 15–25 kPa) and represents the average ultimate holding capacity under static load.

Size (kg)	Weight (kg)	Weight (lbs)	Fluke Width (mm)	Shank Length (mm)	Holding Power (kN)	Material Grade	Surface Treatment
5	5.0	11.0	180	320	15.0	U2	Hot-dip galvanized (≥80µm)
10	10.2	22.5	250	450	30.0	U2	Hot-dip galvanized (≥80µm)
20	20.5	45.2	350	620	60.0	U3	Hot-dip galvanized (≥100µm)
35	35.8	78.9	480	810	105.0	U3	Hot-dip galvanized (≥100µm)
50	50.3	110.9	580	980	150.0	U3	Hot-dip galvanized (≥100µm)
100	100.7	222.0	820	1350	300.0	U3	Hot-dip galvanized (≥120µm)

Material grade selection is pivotal for longevity and structural integrity. U2 grade (yield strength ≥245 MPa) suits coastal and inland water applications with moderate corrosion exposure. U3 grade (yield strength ≥320 MPa) is mandatory for offshore, high-salinity, or extended-service deployments, offering superior resistance to cyclic stress and pitting corrosion. All anchors undergo non-destructive testing (NDT) via magnetic particle inspection to validate weld integrity and material homogeneity.

Weight tolerances are maintained within ±2% of nominal values to ensure predictable hydrodynamic behavior during deployment. Holding power ratios (typically 30:1 to 40:1 relative to anchor weight in optimal seabeds) are validated through third-party towing tank trials per ISO 20848. Surface treatment adheres strictly to ISO 1461, with zinc coating thickness escalating for larger U3-grade units to counter accelerated galvanic corrosion in aggressive environments. Critical pivot points utilize precision-machined bushings to maintain fluke articulation freedom after prolonged immersion.

Hangzhou Star Marine Technology prioritizes seabed adaptability in our Danforth design. The acute fluke angle (45° ±2°) enables rapid burial in soft substrates, while the streamlined shank minimizes drag during retrieval. Export documentation includes material test certificates (MTCs) traceable to heat numbers, dimensional inspection reports, and ISO compliance statements. For vessels operating in rocky or weedy bottoms, we recommend supplementary holding power analysis based on local seabed surveys, as performance may deviate from standardized test conditions. All anchors are supplied with certified shackles and stowage brackets meeting EN 1345:2015 requirements.

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Shipbuilding Solutions

Hangzhou Star Marine Technology Co., Ltd. delivers comprehensive anchoring solutions tailored for shipbuilding and repair projects worldwide. As a trusted provider of marine equipment, we specialize in the supply of high-performance Danforth anchors, engineered to meet international maritime standards and the demanding operational requirements of modern vessels. Our expertise ensures seamless integration of anchoring systems in both new construction and retrofit applications, supporting shipyards, naval architects, and vessel operators with reliable, cost-effective, and technically sound products.

The Danforth anchor, known for its excellent holding power-to-weight ratio, is ideal for a wide range of vessel types including coastal freighters, fishing boats, yachts, and offshore support vessels. Its design features a stockless, flat-fluke configuration that allows for rapid penetration into soft seabeds such as mud, sand, and clay. At Star Marine, we manufacture and supply Danforth anchors in accordance with classification society standards including CCS, ABS, DNV, LR, and BV, ensuring full compliance and certification for global deployment.

Our end-to-end service model begins with technical consultation during the design phase, where our marine engineers assist in anchor selection based on vessel displacement, bollard pull, and operational profile. We provide detailed load calculations, chain compatibility assessments, and storage layout recommendations to optimize deck integration. For shipyards, this early engagement reduces rework, accelerates installation, and ensures regulatory compliance from the outset.

In repair and retrofit scenarios, Star Marine offers rapid turnaround and global logistics support. Our inventory of standard and custom Danforth anchors enables same-week dispatch for urgent dry-dock projects. We also supply配套 equipment including high-test chain cables, anchor windlasses, and securing devices, ensuring system-level compatibility and performance. Our technical field service team is available for on-site support during installation and commissioning, minimizing downtime and ensuring operational readiness.

All Danforth anchors from Star Marine are manufactured using high-tensile steel with enhanced corrosion resistance, subjected to rigorous quality control, and delivered with full material test certificates (MTCs) and classification documentation. Whether for newbuilds or repairs, our solutions are designed to enhance vessel safety, reliability, and anchoring efficiency.

Below is an overview of standard Danforth anchor specifications available from Hangzhou Star Marine Technology:

Anchor Weight (kg)	Holding Power (kN)	Recommended Chain Size (mm)	Suitable Vessel Size (LOA)	Classification Approval
25	28	13	Up to 15 m	CCS, ABS, DNV
50	45	16	15–20 m	CCS, ABS, DNV, LR
100	75	19	20–28 m	CCS, ABS, DNV, LR, BV
200	120	22	28–35 m	CCS, ABS, DNV, LR, BV
350	180	25	35–45 m	CCS, ABS, DNV, LR, BV

Star Marine remains committed to delivering fast, technically robust anchoring solutions that support the evolving needs of the global maritime industry.

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Packaging & Logistics

Packaging & Logistics Protocol for Danforth Anchors

Hangzhou Star Marine Technology implements rigorously standardized packaging and logistics procedures for Danforth anchors to ensure global shipment integrity and regulatory compliance. All export packaging is engineered to withstand maritime transit stresses, including humidity, salt exposure, and dynamic handling forces inherent in international containerized freight. Our systems adhere strictly to IMO and IACS guidelines for marine equipment transport, with primary focus on preventing mechanical damage, corrosion, and customs clearance delays.

Wooden export crates constitute the primary packaging solution for Danforth anchors, fabricated exclusively from ISPM 15 certified lumber. These crates undergo mandatory heat treatment (HT) to a minimum core temperature of 56°C for 30 minutes, eliminating pest infestation risks. Each crate surface bears the internationally recognized ISPM 15 stamp, including country code (CN), producer ID, and HT certification mark. Internal anchor securing employs marine-grade corrosion inhibitors and vibration-dampening materials, with anchors immobilized via steel strapping to prevent shifting. Crates are designed for optimal ISO container utilization, featuring standardized external dimensions compatible with 20ft and 40ft dry freight containers.

For high-volume or project cargo shipments, galvanized steel pallets serve as an alternative solution. Constructed from 3mm thick ASTM A36 steel with hot-dip galvanization (minimum 275g/m² zinc coating), these pallets resist saltwater corrosion during extended port layovers. Anchors are welded to pallet frames using certified marine-grade electrodes, with critical surfaces coated in temporary VCI (Vapor Corrosion Inhibitor) paper. Steel pallet configurations maintain full visibility for customs inspections and facilitate direct forklift handling at destination ports.

The following table details key packaging specifications:

Packaging Type	Dimensions (LxWxH)	Max Load Capacity	Treatment Standard	Typical Anchor Size Range
ISPM 15 Wooden Crate	1.8m x 1.2m x 1.5m	3,500 kg	Heat Treated (HT)	15kg to 500kg
Galvanized Steel Pallet	1.2m x 1.0m x 0.3m	5,000 kg	Hot-Dip Galvanized	200kg to 1,200kg

All shipments originate from our certified consolidation warehouses in Ningbo and Shanghai ports, China’s premier maritime export hubs. We coordinate directly with Tier-1 shipping lines (COSCO, Maersk, MSC) to secure optimal vessel space and transit times. Pre-shipment documentation includes phytosanitary certificates for wood packaging, detailed cargo manifests with HS code 8301.20.00, and FCA/FAS incoterms documentation. Our logistics partners perform mandatory pre-loading inspections per SOLAS container weight verification (VGM) requirements. Critical to our process is adherence to port-specific regulations at Ningbo-Zhoushan and Shanghai Yangshan terminals, including electronic cargo release systems and 24-hour advance manifest filing.

Hangzhou Star Marine Technology maintains real-time shipment tracking via integrated maritime logistics platforms, providing clients with automated updates from warehouse dispatch through final port discharge. This end-to-end control ensures Danforth anchors arrive at global destinations in operational condition, fully compliant with destination country import protocols and ready for immediate vessel deployment.

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Contact Star Marine

For marine operators and procurement specialists seeking reliable, high-performance anchoring solutions, Hangzhou Star Marine Technology Co., Ltd. stands as a trusted global supplier of premium marine equipment. As a leading manufacturer specializing in anchoring systems, we deliver engineered excellence that meets international maritime standards. Our Danforth anchors are designed for superior holding power, corrosion resistance, and operational durability across a wide range of seabeds and vessel types. Built in strict compliance with classification society requirements, including CCS, ABS, DNV, and LR, each anchor undergoes rigorous quality control to ensure consistent performance in demanding marine environments.

At Hangzhou Star Marine Technology, we understand that selecting the right anchoring equipment is critical to vessel safety, operational efficiency, and long-term cost management. That’s why our engineering team focuses on optimizing design parameters such as fluke angle, shank strength, and weight distribution to maximize seabed penetration and holding capacity. Whether for commercial shipping, offshore support vessels, or recreational yachts, our Danforth anchors provide dependable performance in sandy, muddy, or soft clay bottoms—common conditions where traditional anchor types may underperform.

We offer a comprehensive product range tailored to various vessel sizes and operational profiles. Each anchor is manufactured using high-tensile steel and treated with advanced protective coatings to resist marine corrosion and extend service life. Our production facility integrates precision forging, automated welding, and non-destructive testing to maintain product integrity across every production batch. In addition to standard models, we support custom configurations based on specific vessel plans or project requirements, ensuring seamless integration with existing deck machinery and chain systems.

To support global clients effectively, we maintain efficient logistics networks with export experience to over 50 countries. Our team provides full technical documentation, including material test certificates, load calculations, and compliance reports, to facilitate smooth customs clearance and vessel classification approvals.

For detailed technical specifications, pricing, or project consultation, we encourage direct engagement with our Product Manager, Kacher YE. With extensive expertise in marine anchoring systems and export operations, Kacher serves as the primary technical liaison for all client inquiries, ensuring accurate, timely, and professional support.

The following table outlines key technical data for our standard Danforth anchor series:

Model	Weight (kg)	Fluke Width (mm)	Shank Length (mm)	Recommended Chain Size (mm)	Applicable Vessel Length (m)
DA-20	20	320	680	13	8–12
DA-35	35	410	820	16	12–16
DA-55	55	520	1050	19	16–20
DA-80	80	640	1280	22	20–25
DA-120	120	780	1560	25	25–30

Contact Product Manager Kacher YE directly at [email protected] to discuss your anchoring requirements, request product catalogs, or obtain a project-specific quotation. We are committed to delivering engineered solutions that enhance marine safety and operational reliability worldwide.

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