This application is dimension of fastener. It has many types of bolt, nut, pin and washer. Bolts - Countersunk - Hex Head - Hex Head Flange - Button Head - Set Screw - Socket Head - Square Head Nuts - Cap Nut - Hex Nut - Hex Flange - Hex Slotted - Square Nut - Wing Nut Pins - Clevis Pin - Cylindrical - Taper Washer - Plain Washer - Spring Washer - Taper Washer - Square Washer