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A4 stainless steel (AISI 316) offers greater corrosion resistance than A2 (AISI 304), especially in high-salinity environments. A4 contains molybdenum, which makes it more resistant to chloride pitting. Therefore, A4 is recommended for applications most exposed to seawater.
We strongly advise against using non-stainless steel fasteners on marine engines. Galvanic corrosion can quickly damage the fasteners and surrounding parts, compromising the safety and reliability of the engine.
Regularly apply marine grease to the threads and clean the fasteners with fresh water after each use in the sea. Avoid direct contact between dissimilar metals to prevent galvanic corrosion. Consider using dielectric insulators between dissimilar metals.
UNC stands for Unified National Coarse, and it is an American thread standard. It is a coarse thread, suitable for general applications. It is important to use the correct thread to avoid damage to the engine.
The correct torque settings for your engine's bolts are specified in the engine's user manual. Alternatively, you can consult the parts diagrams or contact a specialized mechanic.
Split lock washers are designed to prevent bolts from loosening due to vibration. Their particular shape exerts constant pressure that keeps the bolt in place.
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