Fastener Type: Hex Serrated Flange Nut. Thread Diameter: 1/4"; Thread Size: 20 threads per inch; Flange Diameter(A): 15mm/0.59". Width Across Flat Size (B) : 11mm/0.43"; Nut Height (M) : 15mm/0.59". 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..
