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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.
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. The radial fine teeth form indentations on the contact surface.
Classification Society Fasteners (Certified Shipbuilding Fasteners) are specialized fasteners rigorously certified by international ship classification societies (such as DNV, ABS, LR). The core application directions include:
