Function and test method of self - tapping screw triple screw

Triple screw is also called triple screw.The name si yi, is by a screw with a spring pad and a flat pad.A screw that is then screwed together by rubbing threads.Combination screws are made of iron and stainless steel.Iron, screw wire 1010, 1018, 10B21 and other screw material.The common pier of iron needs electroplating, electroplating has divided environmental protection and ordinary.

Country label of three combination screws

Three combination screws according to the national standard to be divided, there are GB9074.8, GB9074.4, GB9074.13, but these three are commonly used.GB9074.8 refers to three combination screws with small disk head.GB9074.4 refers to the combination screw with large pan head.GB9074.13 refers to the outer hexagon triplex screw.Three combination screws commonly used on these three, if not commonly used, when you can check the hardware manual.For example, some combination of two screws, and the combination of teeth and so on.

The regulation of country label of 3 combination screw: have experience of combination screw commonly, can distinguish with inside eye, what call GB9074.8, GB9074.4, the difference of small dish head and big dish head, the difference of outside hexagon head.Use caliper to measure the specification of three combination screws.How big is it? How long is it? How thick is the combination screw head? How thick is the flat pad? How big is the outside diameter of the flat pad?Use the salt spray machine to measure how many hours the salt spray of the combination screw is.The environmental testing machine is used to test whether the three combination screws are environmentally friendly.It's not green.

The function of three combination screws

Three combination screws are used for connection between thin metal plates.When connecting, first make a threaded base hole for the connected piece, then screw the combination screw into the threaded base hole of the connected piece.Due to the high hardness of the threaded surface of the combination screw, the internal thread can be tapped out in the threaded base hole of the connected piece, thus forming a connection.

Test method for three combination screws

Three combination screw material: decided to use the test machine to test the combination screw wire material, there are divided into iron and stainless steel.Iron wire is divided into 1010 wire and 1018 wire, 10B21 wire, etc., stainless steel is divided into stainless steel 201, 304, etc.