A castle nut tetanized, or a slotted or castellated nut, has slots cut into one end. They resemble the crenellations of a medieval castle—hence the name. They are often used in applications where vibrations or mechanical stress could cause a standard nut to loosen over time.
Castle Nut Tetanized
Castle nuts will typically stay in place. Tetanized or galvanized castle nuts have a layer of zinc to protect them from rust and corrosion in harsh environments or outdoor applications. They are durable and resist corrosion.
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