Square nuts are a type of fastener characterized by their four-sided, square shape, which provides greater surface contact with the workpiece, enhancing resistance to loosening. These nuts are often used in conjunction with square-headed bolts or in applications where a strong, secure hold is required. Square nuts are available in various materials, including stainless steel, which offers excellent corrosion resistance, making them suitable for use in harsh environments. Additionally, many square nuts are zinc plated, providing an extra layer of protection against rust and wear. Their robust design and material options make square nuts a reliable choice for securing components in construction, woodworking, and heavy machinery.