Fastener Type: Hex Serrated Flange Nut. Thread Diameter: M8; Thread Pitch: 1.25 ; Flange Diameter(A): 16.4mm/0.65". Width Across Flat Size (B) : 13mm/0.51"; Nut Height (M) : 7mm/0.28". 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..
