Introduction Of China Nut Connection

  • Bolt Factory introduces the connection of double-ended studs

           Stud connection uses studs, washers and nuts to fix the connected parts. As shown in the figure below, stud bolt connection is used to connect parts that are too thick or restricted by structure. occasion. One of the connected parts is processed with screw holes, and the remaining parts are processed with through holes. In this example, a spring washer is used to prevent loosening. Both ends of the double-ended stud have threads, one end should be screwed into the screw hole of the connecting part, called the screw end; the other end is used to tighten the nut, called the fastening end. When drawing the assembly drawing of the bolted connection, the nominal length of the stud bolt should be calculated first, and the standard value should be used. The following is an example.

           Among them: bm = d (general steel parts, GB897-88) bm = 1.25d (general castings, GB898-88) bm = d (general castings, GB89988) bm = d (general aluminum alloy parts, GB900-88) a = 0.3 d = 0.2 d

           When one of the two connecting parts is thick or not suitable for bolt connection, stud bolts are usually used for connection. As follows. First, a blind hole is machined on the connected base, and a through hole is machined on the other connected part. Both ends of the stud are screwed with threads. When connecting, select all the screw ends of the stud bolt in the screw hole of the base part, then place another connected part, then place the washer and tighten the nut to make the connection.

           Double-end studs (GB897~900-88) are usually ordinary coarse threads, and ordinary fine thread or transitional fitting threads (according to GB1167) can also be used as needed.

    1. The washers connected by stud bolts can be flat washers or spring washers;
    2. The fixed length of the double-end stud thread can be adjusted according to the thickness of the connecting plate;
    3. The thread end line should be separated from the drilling depth line to indicate the correct drawing method. Keywords: double-ended stud; flat washer, elastic washer, drilling depth, screw hole depth. The keywords currently used in the manual "Mechanical Drawing" (Second Edition of Higher Education) Chapter 7 "General Parts" are in the second part of "Special Representations", "Threaded fasteners and their connection drawing methods" There are some problems with the size requirements and the selection of connector types in the drawing method of double-ended stud connections. The manual mentions the double-ended stud connection: the end of the double-ended stud connection is composed of studs, nuts and washers. When one of the connected parts is too thick to be drilled in the through hole or cannot be drilled, when the double-headed China Nut is mainly used for connection, screw the screw end of the double-headed stud into the threaded hole of the connection part, and Pass the fastening end through the hole. Pass through the thinnest part, then place the washer and tighten it with a nut.