Spiralock Hexagon lock nut with flange ISO 4161 Stainless steel A455115
Heavy hexagon nut ASME ≈B18.2.4.6M Stainless steel ASTM A194M Gr.8A22430
Heavy hexagon nut UNC/8UN ASME B18.2.2 Stainless steel ASTM A194 Gr.8A22398