Fastener Type: Hex Serrated Flange Nut. Thread Diameter: M6; Thread Pitch: 1 ; Flange Diameter(A): 13.0mm/0.51". Width Across Flat Size (B) : 9.6mm/0.38"; Nut Height (M) : 5.4mm/0.21". Constructed from carbon steel, black oxide finish, good rust resistance, and durable to use.. Self-locking serrated flange digs into the material being fastened to help prevent loosening..
