12.9 Hex Combination Screw Cup Head Screw

Non-tapping screws are machine screw, the pieceworker to be fastened must be tapped with taps in the screw hole in advance to match the screw threads.

The difference between tooth screws and other screws depends on whether they can be used together with nuts. Tooth screws can be used with nuts. And relative to the screws of other teeth, there are self-tapping screws. The nut of this kind of screw has no bow teeth. As for the standard teeth and fine teeth are only different pitch, it is the nut of the machine screw.

The machine screw also call Precision electronic screws; We usually use C1018 material, of course, a little better can also use C1022 material; This is the most mainstream material;
You can do it with less carbon;
There are special needs, such as stainless steel materials, C1035 for heat treatment, 10B21 for heat treatment to meet different special needs.

Machine screw will include Hex Machine screw,pan machine screw,flat machine screw,truss machine screw,Hexagon socket screws....