Types of non-standard screws Flat heads Hex and hex rivet nuts, through holes, blind holes, knurled and no knurled.
The use of non-standard screws If the nut of a product needs to be installed outside, and the space inside it is too narrow to allow the press head of the riveter to enter the pressure riveting and the budding method, etc., the strength requirements cannot be achieved. Rivets are not feasible. Must use riveting. Applicable to all thickness plate, pipe (0.5MM-6MM) fastening field. The use of pneumatic or manual riveting gun can be riveted once, convenient and firm; replace the traditional welding nut, make up for the thin metal plate, thin tube welding is easy to melt, weld nut is not smooth and other shortcomings.
4Structural rivet nuts are mainly used in the bolt connection of non-structural bearing, such as the connection of interior parts such as rail passenger cars, highway passenger cars, boat moorings, etc. The improved rivet nuts for preventing spin are more excellent than the aircraft's pallet nuts. The advantage is that the weight is lighter, and there is no need to fix the pallet nut by rivets in advance, and no operating space on the back of the substrate can still be used.
National standard rivet nut specifications M3 M4 M5 M6 M8 M10 M12, it is recommended to use M6 and M8, because the thread can be tapped directly on the substrate, and then large bolts, then the weight of the bolt increased, the rivet nut The increase in connection strength is limited, ie the matching is not very reasonable.