Tightening Of Hex Slotted Bolt » Discussions


Tightening Of Hex Slotted Bolt

  • Leader
    February 9, 2020
    High-strength ANSI B18.2.1 bolts can be found in various industrial fields, so how to check the quality of high-strength [u]ANSI B18.2.1[/u] bolts, the following Xintong fasteners share the inspection of high-strength ANSI B18.2.1 bolts for everyone method. High-strength ANSI B18.2.1 bolted joints (ANSI B18.2.1 bolts, nuts, washers) should be supplied in boxes. A factory certificate, quality certificate and quality inspection report are also attached. The inspectors should compare with the design requirements and the current national standards one by one. The non-conforming connection pair must not be used.
    1. High-strength ANSI B18.2.1bolted joints delivered to the construction site shall be inspected in time for the ANSI B18.2.1bolt wedge load, nut guaranteed load, torque coefficient, average value, and standard deviation of the nut and washer hardness jointed joints, and the inspection results It shall meet the technical requirements for high-strength ANSI B18.2.1 bolts and large hex nut washers for steel structures, and shall be used only after qualified.
    2. Before construction of high-strength ANSI B18.2.1bolts, the torque coefficients of high-strength ANSI B18.2.1bolted joints should be inspected in accordance with the factory approval. Five sets of re-inspections should be performed per batch. The average value of the five sets of torque coefficients should be 0, 110-0. Within the range of 150, the standard deviation should be less than or equal to 0.010.
    Tightening of high-strength ANSI B18.2.1 bolts For large nodes, it should be divided into initial screwing, counter screwing and final screwing. The initial screwing torque is about 50% of the construction torque. The high strength ANSI B18.2.1 bolts after the initial screwing or after screwing should be marked with color on the nut. Method Draw a vertical line on the screw; then perform final tightening according to the specified construction torque value. After the final tightening, the high-strength ANSI B18.2.1 bolts are drawn with a flat nut with the same color sub-nuts to the base flange surface. Fourth, high-strength [u]Hex Slotted Bolt[/u] are only allowed to apply torque on the nut when tightening, and allow torque to be applied to the nut when space is limited.