The four-jaw nut is the part that tightly connects the mechanical equipment. The nuts and bolts of the same size can only be connected together through the internal thread. For example, the nut of m4-p0.7 can only be connected with the bolts of m4-p0.7 series (in the nut, the inner diameter of the M4 finger nut is about 4mm, and the distance between the two thread teeth of 0.7 finger is 0.7mm).The same is true of American products. For example, the 1/4 to 20 nut can only be used with 1/4 to 20 screws (the inner diameter of the 1/4 finger nut is about 0.25 inch,20 fingers for every inch, there are 20 teeth).Stainless steel self-locking nuts, locking nuts, locking nuts, four-jaw nuts, nuts into the safety nut, fine screw connection nut self-locking hexagon cap nut special anchor screw nut, hexagon crown thin nut ring nut.Fine thread all metal hex flange lock nut all metal hex flange lock nut non-metallic insert hex flange surface fine thread lock nut fine thread hex flange surface nut welding square nut welding hexagonal nut fastening nut flush round nut grooved round nut side perforated round nut end perforated round nut small round nut round nut ring nut butterfly nut copper copper nut inlaid copper nut knurled copper nut built-in copper nut molding copper nut and other alloy copper zinc alloy nut, etc