Expansion anchors, also known as metal expansion anchors, are used to fix objects to a surface by creating friction and grip through the expansion of a wedge-shaped piece. One end of the screw has threads, and the other end has a tapered point. The outer casing is usually made of metal, with a round tube half-filled with slits. These are inserted into the holes drilled into the wall, followed by locking the nut. The nut pulls the screw out, which expands the tapered point into the metal tube, causing the tube to expand and firmly fix the object to the wall. These are commonly used for securing items like guardrails, awnings, and air conditioners to surfaces made of materials like cement or brick. However, the fix is not very reliable, and if there is a lot of vibration, the anchor may loosen, so it is not recommended for installing ceiling fans and other items.
Expansion anchors, such as anchors, are composed of components such as screws and expansion tubes. The tail of the screw is conical, and the inner diameter of the cone is larger than the inner diameter of the expansion tube. When the nut is tightened, the screw moves outward, and the axial movement of the thread makes the conical part move, thereby forming a large positive pressure on the outer periphery of the expansion tube. In addition, the angle of the cone is very small, which forms friction and self-locking between the wall, the expansion tube, and the cone, thereby achieving the role of fixing.
The spring washers on the expansion anchors are standard components. Because they have open ends and are elastic, they are called spring washers. The function of spring washers is to use the sharp points of the open ends to pierce the nuts and flat washers, preventing the nuts from loosening.
Flat washers are also standard components, and their function is to distribute the pressure from the nuts evenly across the parts being connected.
The expansion bolt grade is divided into: 45, 50, 60, 70, 80.
The material of expansion screws: mainly divided into austenite A1, A2, and A4.
Martensite and ferrite C1, C2
Steel No. 45, for important or special purpose threaded joints, can be selected from 15Cr, 20Cr, 40Cr, 15MnVB, 30CrMnSi, and other high-mechanical-property alloy steels.
Select different expansion screws according to the actual situation of the wall. Generally, there are several types: 6×60, 6×80, 6×120, and 6×150.
6×60: total length 60 mm, casing length 45 mm, diameter 8 mm, wall thickness 0.7 mm, surface is galvanized with color zinc; screw length 60 mm, diameter 6 mm, thread part 35 mm, cone-shaped bottom rod hammer 8mm, surface is galvanized with color zinc; nut outer diameter 10 mm octagonal, thickness 5 mm, surface is galvanized with white zinc; gasket outer diameter 13 mm, thickness 1mm, inner diameter 6 mm, surface galvanized with white zinc; spring piece is an outer diameter 9 mm, inner diameter 6 mm, thickness 1.6 mm ring.
6×80: Total length 80 mm, casing length 65 mm, diameter 8mm, wall thickness 0.7 mm, surface is galvanized; screw length, nut, gasket, spring plate are the same.
6×120: Total length 120mm, casing length 105mm, diameter 8mm, wall thickness 0.7mm, surface is galvanized; screw length, nut, gasket, spring plate are the same.
6×150: Total length 150mm, casing length 135mm, diameter 8mm, wall thickness 0.7mm, surface is galvanized; screw length, nut, gasket, spring plate are the same.
Expansion Anchors generally speak of metal expansion screws. Expansion screws anchors use wedge slope to force expansion to produce friction and grip to achieve anchors. The screw is threaded at one end and tapered at the other. The outer bread is a tin some steel pipe the tin cylinder steel pipe half has a number of notches.Put them together into the wall hole and then lock the nut. The nut pulls the screw outward, and the taper pulls into the tin cylinder. The tin cylinder is opened so tightly fixed on the wall. It is generally used for guardrail, awning, air conditioning, and so on. But its fixing is not very reliable.If the load has a large vibration, it may loosen, so it is not recommended for the installation of ceiling fans.
Expansion screw anchors consist of a screw and an expansion tube, along with other components. The tail of the screw is conical, and the inside diameter of the cone is larger than the inside diameter of the expansion tube. When the nut is tightened, the screw moves outward, and the cone part moves through the axial movement of the thread.Then, it forms a great positive pressure on the outer surface of the expansion tube and the angle of the cone is very small, so that the friction between the wall of the expansion tube and the cone is self-locking, and then achieves the fixing effect.
Expansion screw anchors, also known as spring anchors, are standard components. They are called spring anchors because their openings are splintered and elastic. Spring anchors are used to insert the nut and pad with the sharp angle of the splintered opening to prevent the nut from loosening.
The flat washer is also a standard part. Its function is to distribute the pressure of the nut evenly across the connected parts.
Expansion bolt grades: 45, 50, 60, 70, 80.
Expansion screw material: main austenite A1, A2, A4,
Martensite and ferrite C1 and C2
45 steel, for important or special purpose threaded connections, can choose 15Cr, 20Cr, 40Cr, 15MnVB, 30CrMoSi and other alloy steels with higher mechanical properties.
Please select different expansion screws according to the actual situation of the wall. Generally, there are the following kinds of 6×60, 6×80, 6×120, 6×150.
6×60 the total length is 60 mm the casing length is 45 mm the diameter is 8 mm the wall thickness is 0.7 mm the surface is coated with colored zinc Screw length 60 mm diameter 6 mm thread part 35 mm the bottom rod hammer 8mm conical the surface is painted zinc plating The nut is octagonal with an outer diameter of 10 mm and a thickness of 5 mmThe surface is white zinc plated. Gasket outer diameter 13 mm, thickness 1mm, inner diameter 6 mm, surface coated with white zinc. The shrapnel is a ring with an outer diameter of 9 mm, an inner diameter of 6 mm, and a thickness of 16 mm.
6×80: the total length is 80 mm, the casing length is 65 mm, the diameter is 8mm, the wall thickness is 0.7 mm, the surface is coated with colored zinc; Screw length, nut, gasket, shrapnel as above.
6×120: the total length is 120mm, the casing length is 105mm, the diameter is 8mm, the wall thickness is 0.7mm, and the surface is coated with colored zinc; Screw length, nut, gasket, shrapnel as above.
6×150: the total length is 150mm, the casing length is 135mm, the diameter is 8mm, the wall thickness is 0.7mm, the surface is coated with colored zinc; Screw length, nut, gasket, shrapnel