Technical requirements for the thickness of the screw thread of the round head phillips machine screw?
In order to reduce the risk of the round head phillips machine screw during assembly, the thickness of the plating layer is strictly controlled during the surface treatment to ensure that the screw fasteners after plating do not exceed the customer’s tolerance. Table 1 Coating Thickness (unit:μm) Nominal plating thickness Effective coating thickness Local thickness min Batch average thickness min max 3 3 3 5 5 5 4 6 8 8 7 10 10 10 9 12 12 12 11 15 15 15 14 18 20 20 18 23 25 25 23 28 30 30 27 35 If the nominal length of the round head phillips machine screw is l>5d, when measuring the average thickness of the batch, the thickness of the coating should be less than the tolerance specified in Table 1, see Table 2. Table 2 Upper Deviation Value Of Ordinary Thread Plating Thickness Thread P/mm Coarse thread nominal diameter d/mm External thread Tolerance zone position g Tolerance zone position f Tolerance zone position e Basic d...