Engineered for reliable locking applications, this concave square locknut serves as an essential component when securing fasteners in place. With a size of 5/8 inch, it utilizes a unique design where the concave side, when pressed against a square nut, compresses and deforms slightly, enhancing grip on the bolt threads and ensuring a secure fit. Crafted from durable materials and hot dip galvanized to meet ASTM Specification A153 standards, this locknut is built to withstand the rigors of aerial hardware and pole installations, providing both strength and longevity in demanding environments. Its effective performance makes it a vital choice for professionals in the field of aerial line hardware.