A perforated block (usually of metal) possessing an internal screw thread, intended for use on an external screw thread such as a bolt for the purpose of tightening or holding two or more bodies in definite relative positions.
Hexagon Nut (Regular), Hexagon Nut (Thin), Cap Nut, Square Nut, Weld Nut, Wing Nut, Flange Nut, Nominal Dia., Thickness (regular), (thin), Across Flat, Height, Across Flat