Hard-to-Find Fastener 014973268367 Coarse Kep Lock Nuts, 4-40, Piece-100 Diameter: #4 Thickness: 3/32 inches Material: Steel Finish: Zinc Driver Type: 1/4" Wrench Diameter: #4 Material: Steel Finish: Zinc Driver Type: 1/4 Wrench Thread Type: 40 (Coarse)