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Home > High Strength Stainless Steel Fasteners > China Classification Society Fasteners Supplier - Certified Marine Fasteners from a Trusted Factory
China Classification Society Fasteners Supplier - Certified Marine Fasteners from a Trusted Factory
China Classification Society Fasteners Supplier - Certified Marine Fasteners from a Trusted Factory
China Classification Society Fasteners Supplier - Certified Marine Fasteners from a Trusted Factory
China Classification Society Fasteners Supplier - Certified Marine Fasteners from a Trusted Factory
China Classification Society Fasteners Supplier - Certified Marine Fasteners from a Trusted Factory
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China Classification Society Fasteners Supplier - Certified Marine Fasteners from a Trusted Factory
China Classification Society Fasteners Supplier - Certified Marine Fasteners from a Trusted Factory
China Classification Society Fasteners Supplier - Certified Marine Fasteners from a Trusted Factory
China Classification Society Fasteners Supplier - Certified Marine Fasteners from a Trusted Factory
China Classification Society Fasteners Supplier - Certified Marine Fasteners from a Trusted Factory

China Classification Society Fasteners Supplier - Certified Marine Fasteners from a Trusted Factory

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China's classification society fasteners are specialized fasteners that have received certification from classification societies for application in ships and marine engineering. The selection, material, and installation processes of these fasteners must adhere strictly to international maritime safety standards.

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Our fasteners are extensively utilized in niche sectors such as special shipbuilding, offshore oil drilling platforms, submarine pipelines, and offshore wind power. In these critical applications, obtaining a classification society certificate for the fasteners is mandatory. As a leading supplier in the industry, our factory offers a range of classification society certificates, including:

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(Classification society inspection certificate

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(Classification society type approval certificate

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(Classification society product approval certificate

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Product Description

Products Features

1 Material Selection

In high-temperature environments (>200℃), 42CrMo chromium-molybdenum alloy steel (such as A193 B7) should be used. It can withstand temperatures up to 480℃ and has a tensile strength of ≥860 MPa.

Extremely cold environment (<-50℃) recommends A320 L7 material with nickel-chromium-molybdenum composite strengthening.

2 Anti-Loosening Technology

The wedge-shaped lock washers (such as the Nord-Lock system) are used. The geometric structure with a slope angle greater than the thread rise angle is adopted to prevent vibration loosening. And the radial fine teeth form indentations on the contact surface.

⚡ The creep vibration test is used to verify its anti-loosening performance and is applicable to scenarios with dynamic loads such as wind turbine towers and ship decks.

Application

Classification Society Fasteners (Certified Shipbuilding Fasteners) are specialized fasteners that have been rigorously certified by international ship classification societies (such as DNV, ABS, LR, etc.). Their application fields mainly focus on ships, marine engineering, and related industries. The core application directions are as follows:

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(1) Ship Structure Connection Bolt/nut combinations for critical parts such as decks, bulkheads, and keels must comply with ISO 3506-3 standards (salt spray corrosion resistance grade ≥ 720 hours).
⚙️
(2) Power System Fixed Main unit base bolts must pass dynamic load tests (tensile strength ≥ 800 MPa), and the material is mostly 316L stainless steel.
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(3) Offshore Platform Construction Mooring frame connection components must pass the -40℃ low-temperature impact test and comply with the DNV-OS-C501 specification.
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(4) LNG Storage Tank Installation Low-temperature flange bolts should be made of nickel-based alloys (such as Inconel 718) to ensure sealing performance under -196℃ conditions.
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(5) Dock Mooring System Locking nuts must have self-locking function (torque attenuation rate ≤ 5%), and the material is duplex stainless steel 2205.
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(6) Offshore Wind Turbine Tower Foundation ring bolts must meet ISO 4014 tolerance grade (M24–M64) and have a shear strength of ≥ 600 MPa.
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(7) Tidal Energy Device Underwater fasteners need to undergo bio-adhesion protection treatment (coating thickness ≥ 50 μm).
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(8) Anchor Fixation of Cross-Sea Bridge Prestressed anchor components must undergo 2 million fatigue tests and comply with the EN 1090 standard.

Frequently Asked Questions (FAQ)

Q What materials are recommended for fasteners used in high-temperature environments above 200℃?
For high-temperature environments exceeding 200℃, 42CrMo chromium-molybdenum alloy steel — such as A193 B7 — is recommended. This material can withstand temperatures up to 480℃ and offers a tensile strength of ≥860 MPa, making it suitable for demanding thermal conditions.
Q How does the wedge-shaped lock washer system prevent vibration loosening?
The Nord-Lock wedge-shaped lock washer system uses a geometric structure where the slope angle exceeds the thread rise angle. This design, combined with radial fine teeth that create indentations on the contact surface, effectively prevents loosening caused by vibration and dynamic loads — as verified through creep vibration testing.
Q Which international classification societies certify shipbuilding fasteners?
Classification Society Fasteners are certified by leading international ship classification societies including DNV (Det Norske Veritas), ABS (American Bureau of Shipping), and LR (Lloyd's Register), among others. These certifications ensure the fasteners meet strict safety and performance standards for marine and offshore applications.
Q What material is suitable for LNG storage tank flange bolts operating at -196℃?
For LNG storage tank installations requiring reliable sealing performance at extremely low temperatures of -196℃, nickel-based alloys such as Inconel 718 are recommended. These materials maintain mechanical integrity and sealing capability under cryogenic conditions.
Q What are the key requirements for fasteners used in offshore wind turbine tower foundations?
Foundation ring bolts for offshore wind turbine towers must conform to ISO 4014 tolerance grades in the range of M24 to M64, and must achieve a shear strength of ≥ 600 MPa. These requirements ensure structural reliability under the significant dynamic and environmental loads experienced at sea.
Q What fatigue and compliance standards apply to prestressed anchor components on cross-sea bridges?
Prestressed anchor components used in cross-sea bridge applications must undergo a minimum of 2 million fatigue test cycles to ensure long-term structural durability. In addition, they must comply with the EN 1090 standard, which governs the execution of steel and aluminium structures in construction.

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