Fastener Type: Hex Serrated Flange Nut. Thread Diameter: 5/16"; Thread Size: 18 threads per inch; Flange Diameter(A): 17mm/0.67". Width Across Flat Size (B) : 13mm;Nut Height (M) : 7mm. Constructed from carbon steel, zinc plated finish, good rust resistance and durable to use.. Self-locking serrated flange digs into the material being fastened to help prevent loosening..
