Studless Anchor Chain

The Studless Anchor Chain is a vital part of a ship's anchoring system. its link structure is simple and smooth, lacking studs. This gives it great flexibility, enabling it to meet the anchoring needs of ships in various sea conditions.

It can perform stably in harsh marine environments, reducing anchoring risks. Ideal for small fishing boats and coastal small cargo ships, this chain provides safe and reliable anchoring.

Material & Certification

Grade 3 High-Tensile Carbon Steel (complying with ISO 4565 and API standards), with yield strength ≥690 MPa and tensile strength ≥830 MPa (verified by material test reports).

Surface treated with 85-100μm zinc plating, passing 3,000-hour salt spray tests (5% NaCl) without visible corrosion (IMO MSC.328(90) certified).

Certified by major classification societies: ABS, CCS, DNV, GL, KR, LR, etc., ensuring compliance with international maritime safety regulations (SOLAS).

Structural Design & Dimensions

Stud-Free Link Design with a stress-optimized arc radius of 42mm, reducing weight by 15% compared to studded chains while maintaining 92% of tensile strength.

Standard Length per Shackle: 27.5m (15 fathoms), customizable for S-side (385m) and P-side (357.5m) in dual-anchor systems.

Diameter Range: 12.5mm to 152mm, with corresponding breaking loads:

12.5mm: 92kN (Grade 2) / 132kN (Grade 3)

50mm: 1,370kN (Grade 2) / 1,960kN (Grade 3)

102mm: 5,120kN (proof load) / 7,312kN (breaking load)

Application Scenarios

• Anchoring of Small Ships: Small fishing boats, yachts, small cargo ships, etc. Due to its flexible operation and low cost, it is an ideal choice for the anchoring of such ships. It can stably fix ships in ports and offshore areas, ensuring safe berthing.
• Operations of Inland River Ships: In inland river channels, the water flow is complex and changeable. The flexibility of the studless anchor chain can help ships better adapt to the changes in water flow and achieve reliable anchoring.

Performance & Load Parameters

Grade 2 Chain:

Proof Load (PL): Calculated by PL = 0.0137 × D² (kN), e.g., D=24mm: PL=237kN.

Breaking Load (BL): BL = 0.0196 × D² (kN), e.g., D=24mm: BL=332kN.

Grade 3 Chain:

PL = 0.0180 × D² (kN), e.g., D=32mm: PL=417kN.

BL = 0.0249 × D² (kN), e.g., D=32mm: BL=583kN.

Fatigue Resistance: 28% higher cyclic load life than studded chains (DNV GL test report No.2024-117).

Manufacturing Process

Cutting: High-precision steel bar cutting with ≤0.5mm tolerance.

Heating: Induction heating to 1,100-1,200°C for uniform microstructure.

Bending: Hydraulic press forming with 42mm arc radius control.

Welding: Studless link welding with penetration depth ≥3.2mm.

Heat Treatment: Quenching and tempering to achieve HB 220-260 hardness.

NDT: 100% magnetic particle inspection (MT) for welding defects.

Painting: Two-layer anti-corrosive paint (dry film thickness ≥120μm).

Our production factory is equipped with advanced production equipment. From the melting of steel, the manufacturing of chain links to the overall heat treatment, a strict process flow is followed. During the production process, each process is strictly quality-tested to ensure that the product quality meets international standards. The product has obtained certifications from multiple classification societies recognized by IACS (International Association of Classification Societies), such as DNV, GL, ABS, LRS, RINA, BV, NK, KR, IRS, RS, etc., providing a strong endorsement for product quality.

Accessories & Spares

Kenter Shackles: 4,040kg (for 102mm chain), made of Grade 3 steel.

Swivel Pieces: 1,210kg per unit, reducing torsional stress by 70%.

Spare Taper Pins: SUS304 stainless steel, 5 spares for Kenter shackles.

Tools: Including 4.5kg anchor hammers and disengaging tools for emergency release.

Delivery

We have an efficient production team. After receiving an order, we will quickly arrange the production plan according to the order quantity and specifications to ensure that the production is completed within the agreed time. At the same time, we will conduct strict factory inspections on the products to ensure that the delivered products are of qualified quality.

Services

We provide comprehensive after-sales services. If customers encounter any problems during the use of the product, our professional technical team will promptly provide answers and technical support. If there are quality problems with the product, we will provide services such as free repair or product replacement according to the actual situation, allowing customers to have no worries.