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Home > High Strength Stainless Steel Fasteners > Custom Classification Society Fasteners for Ships and Marine Engineering - China Suppliers and Factory Certified Suppliers, Exporter
Custom Classification Society Fasteners for Ships and Marine Engineering - China Suppliers and Factory Certified Suppliers, Exporter
Custom Classification Society Fasteners for Ships and Marine Engineering - China Suppliers and Factory Certified Suppliers, Exporter
Custom Classification Society Fasteners for Ships and Marine Engineering - China Suppliers and Factory Certified Suppliers, Exporter
Custom Classification Society Fasteners for Ships and Marine Engineering - China Suppliers and Factory Certified Suppliers, Exporter
Custom Classification Society Fasteners for Ships and Marine Engineering - China Suppliers and Factory Certified Suppliers, Exporter
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Custom Classification Society Fasteners for Ships and Marine Engineering - China Suppliers and Factory Certified Suppliers, Exporter
Custom Classification Society Fasteners for Ships and Marine Engineering - China Suppliers and Factory Certified Suppliers, Exporter
Custom Classification Society Fasteners for Ships and Marine Engineering - China Suppliers and Factory Certified Suppliers, Exporter
Custom Classification Society Fasteners for Ships and Marine Engineering - China Suppliers and Factory Certified Suppliers, Exporter
Custom Classification Society Fasteners for Ships and Marine Engineering - China Suppliers and Factory Certified Suppliers, Exporter

Custom Classification Society Fasteners for Ships and Marine Engineering - China Suppliers and Factory Certified Suppliers, Exporter

Classification society fasteners are specialized components that have received certification from classification societies for implementation in ships and marine engineering applications. It is crucial that the selection, material, and installation of these fasteners adhere to international maritime safety standards, Our fasteners are extensively utilized in sectors such as specialized shipbuilding, offshore oil drilling platforms, submarine pipelines, and offshore wind energy projects. For applications in critical areas, possessing a classification society certificate for these fasteners is mandatory. As a leading supplier and factory in China, we provide various essential classification society certificates, including:, (Classification Society Inspection Certificate, (Classification Society Type Approval Certificate, (Classification Society Product Approval Certificate, Trust our fasteners for compliance with maritime standards and enhance the safety and reliability of your marine projects
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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. Their application fields mainly focus on ships, marine engineering, and related industries.

🚢
(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 resistance ≥ 720 hrs
⚙️
(2) Power System Fixed
Main unit base bolts must pass dynamic load tests. Material is mostly 316L stainless steel.
Tensile strength ≥ 800 MPa
🏗️
(3) Offshore Platform Construction
Mooring frame connection components must pass the -40℃ low-temperature impact test and comply with DNV-OS-C501 specification.
-40℃ Impact Certified
🧊
(4) LNG Storage Tank Installation
Low-temperature flange bolts made of nickel-based alloys (such as Inconel 718) ensure sealing performance under extreme cold.
Sealing at -196℃
⚓
(5) Dock Mooring System
Locking nuts must have self-locking function. Material is duplex stainless steel 2205.
Torque attenuation ≤ 5%
🌬️
(6) Offshore Wind Turbine Tower
Foundation ring bolts must meet ISO 4014 tolerance grade (M24–M64).
Shear strength ≥ 600 MPa

Frequently Asked Questions

Q
What material should be used for fasteners in high-temperature environments above 200℃?
For 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.
Q
How do wedge-shaped lock washers prevent fastener loosening?
Wedge-shaped lock washers utilize a geometric structure with a slope angle greater than the thread rise angle. This design mechanically resists rotational loosening under vibration, while radial fine teeth create indentations on the contact surface.
Q
Which classification societies certify shipbuilding fasteners?
Major international classification societies include DNV, ABS, and LR. Certification from these bodies ensures that fasteners meet stringent safety, material, and performance standards required for marine and offshore environments.
Q
What fastener material is suitable for LNG storage tanks operating at -196℃?
LNG storage tank flange bolts require nickel-based alloys such as Inconel 718. These materials maintain their mechanical integrity and sealing performance at cryogenic temperatures as low as -196℃.
Q
What anti-corrosion standards must marine fasteners meet for ship structure connections?
Fasteners used in ship structural connections must comply with ISO 3506-3 standards, requiring a salt spray corrosion resistance grade of ≥720 hours to ensure durability in saltwater.
Q
What special requirements apply to fasteners used in offshore wind turbine tower foundations?
Foundation ring bolts for offshore wind turbine towers must conform to ISO 4014 tolerance grades (M24–M64) and achieve a shear strength of ≥600 MPa to handle dynamic wind and wave loading.

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