standard bolt,screw

 The standard bolt, screw made in this factory may be quadrate, hexangular, hexangular flange, hexangular cross recessed, hexangular spherical, hexagon socket, hexagon socket flange, hexagon socket countersunk head, hexagon socket flat head, cross recessed countersunk head, cross recessed raised countersunk head, cross recessed flat, flange spherical, quincuncial flange or quincuncial pan head. The screw has four types, common screw, tapping screw, shank screw and triangular screw.