Castle Nut
A Castle Nut (also known as a castellated nut) is a hexagonal nut with notched slots (resembling the battlements of a castle) cut into one end. Designed for use with a cotter pin or safety wire through a drilled bolt or axle, it provides a secure locking mechanism that prevents loosening due to vibration or dynamic loads. Castle nuts are commonly used in automotive, aerospace, agricultural, and mechanical assemblies where safety and reliability are critical.
✅ Key Features
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Shape : Hexagonal with vertical slots (castle-style) for mechanical locking
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Thread Type : Coarse (UNC), Fine (UNF), Metric (ISO), or Imperial.
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Sizes Available : M6 to M36 (Metric) / 1/4” to 2” (Imperial)
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Grades : 6, 8, 10 (ISO) | Grade 5, 8 (SAE)