Galvanized Hex Head Bolt Manufacturers,Wall Anchor Eye Bolt,Upset Threads Bolt

An expansion bolt is a special threaded connector used to fix the pipeline support / Hanger/bracket or equipment on the wall, floor, and column. Today, let's talk about the knowledge of expansion bolts.

Expansion bolt composition

The expansion bolt is composed of the countersunk head bolt, expansion tube, flat washer, spring washer, and hexagon nut.

Generally speaking, expansion bolts are metal expansion bolts. The fixing of Wall Anchor Eye Bolt is to use the wedge slope to promote the expansion, produce friction grip force and achieve the fixing effect. One end of the screw is threaded and the other end is tapered. There is an iron sheet (some steel pipes) on the outside. The iron sheet cylinder (steel pipe) generally has several cuts. Insert them into the holes made on the wall, and then lock the nut. The nut pulls the screw outward to pull the taper into the iron sheet cylinder. The iron sheet cylinder is expanded and tightly fixed on the wall. It is generally used for fastening the protective fence, awning, air conditioner, and other materials on cement, brick, and so on. However, its fixation is not very reliable. If the load has large vibration, it may lose. Therefore, it is not recommended to install a ceiling fan, etc.

When drilling and fixing the bolt into the hole of the expansion body, tighten the bolt and nut into the hole of the expansion body first, and then use the hammer to fix it.

It will expand after tightening. There is a big head at the tail of the Wall Anchor Eye Bolt, and around pipe slightly larger than the diameter of the bolt is sleeved outside the bolt. There are several openings at the tail. When the bolt is tightened, the tail of the big head is brought into the open pipe, and the pipe is punched to achieve the purpose of expansion, and then the bolt is fixed on the ground or wall to achieve the purpose of rooting.

Performance grade of expansion bolt

Expansion bolt with a performance grade of 4.6 means:

1. Expansion bolt material: nominal tensile strength reaches 400MPa;

1. The yield ratio of expansion bolt material is 0.6;

1. The nominal yield strength of expansion bolt material is up to 400 × 0.6 = 240mpa grade.

The meaning of performance grade of expansion bolt is an international standard. The performance of an expansion bolt with the same performance grade is the same regardless of its material and place of origin. Only performance grades can be selected in design.

Construction and precautions of expansion bolt

1. Drilling depth: in the specific construction, the depth is best about 5mm deeper than the length of the expansion pipe. As long as it is greater than or equal to the length of the expansion pipe, the length of the inner expansion bolt left underground is equal to or less than the length of the expansion pipe.

1. Of course, the requirement of the internal expansion bolt on the ground is that the harder the better, which also depends on the stress of the object you need to fix. The stress strength installed in concrete (c13-15) is five times that in brick.

1. After an M6 / 8 / 10 / 12 internal expansion bolt is correctly installed in concrete, its ideal maximum static force is 120 / 170 / 320 / 510kg respectively. The installation method of the internal expansion Upset Threads Bolt is not very difficult. The specific operations are as follows; Firstly, select an alloy drill with the same diameter as the expansion screw expansion ring (pipe), install it on the electric drill, and then drill the wall. The depth of the hole should be the same as the length of the bolt, and then lower the expansion screw kit into the hole together, remember; Do not screw off the screw cap to prevent the bolt from falling into the hole when the hole is drilled deep and it is not easy to take it out. Then tighten the nut cap by 2-3 buckles, and then unscrew the nut cap after feeling that the internal expansion bolt is relatively tight without loosening.

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