xingfeng carbon steel wedge penetration expansion anchor bolt fish shell zinc-plated aluminum fixed bolt iron expansion screw

Metal anchors are commonly referred to as expansion anchors. The fixation of these anchors relies on the wedge-shaped slope to generate friction and clamping force, thereby achieving a secure attachment. One end of the screw has threads, while the other end has a taper. It is covered with iron sheet (or steel pipe in some cases). The iron sheet or steel pipe has several cuts on one side; these are inserted into the holes pre-drilled in the wall, followed by locking the nut. The nut pulls the screw outward, allowing the taper to fit into the iron sheet or steel pipe. As a result, the material expands and becomes firmly fixed to the wall. These are typically used for fences, canopies, air conditioners, and other installations on materials such as concrete or brick. However, their fixation is not very reliable. If subjected to significant vibration, they may loosen, so they are not recommended for installing ceiling fans, etc.
Anchors consist of a screw rod and an expansion tube. The end of the screw rod is conical, with the inner diameter of the cone being larger than that of the expansion tube. When the nut is tightened, the screw rod moves outward. Through axial movement of the threads, the conical part moves, thereby creating a large normal pressure on the outer surface of the expansion tube. Additionally, due to the small angle of the cone, friction self-locking is formed between the wall, the expansion tube, and the cone, achieving a fixing effect.
The spring washer on the anchors is a standard part. Due to its offset openings and elasticity, it is called a spring washer. The function of the spring washer is to use the sharp edges from the offset openings to pierce through the nut and the washer, preventing the nut from loosening.
Flat washers are also standard parts, and their function is to evenly distribute the pressure of the nut across the connected components.
The grades of expansion bolts are divided into: 45, 50, 60, 70, 80.
Material of expansion screws: Mainly divided into austenitic A1, A2, and A4
Martensite and ferritic C1, C2
For thread connections that require high importance or special applications, alloy steels with superior mechanical properties such as 15Cr, 20Cr, 40Cr, 15MnVB, and 30CrMoSi can be used.
Select different expansion screws based on the actual condition of the wall. Generally, there are several options: 6×60, 6×80, 6×120, and 6×150.
6×60: Total length 60 mm, sleeve length 45 mm, diameter 8 mm, wall thickness 0.7 mm, with colored zinc plating on the surface; screw length 60 mm, diameter 6 mm, threaded part 35 mm, bottom rod head conical with 8 mm diameter, with colored zinc plating on the surface; nut octagonal in shape, outer diameter 10 mm, thickness 5 mm, with white zinc plating on the surface; gasket outer diameter 13 mm, thickness 1 mm, inner diameter 6 mm, with white zinc plating on the surface; spring piece is a ring with outer diameter 9 mm, inner diameter 6 mm, and thickness 1.6 mm.
6×80: Total length 80 mm, sleeve length 65 mm, diameter 8 mm, wall thickness 0.7 mm, with colored zinc plating on the surface; screw length, nut, gasket, and spring piece are the same as above.
6×120: Total length 120 mm, sleeve length 105 mm, diameter 8 mm, wall thickness 0.7 mm, with colored zinc plating on the surface; rod length, nut, gasket, and spring piece are the same as above.
6×150: Total length 150 mm, sleeve length 135 mm, diameter 8 mm, wall thickness 0.7 mm, with colored zinc plating on the surface; rod length, nut, gasket, and spring piece are the same as above.
Expansion anchors typically refer to metal expansion screws. These screws work by using a wedge-shaped slope to induce expansion, thereby creating friction and grip to achieve anchoring. The screw has a threaded end and a tapered end. The outer part is made of tin (or some steel pipe); the tin cylinder (steel pipe) has several notches. These are assembled into the wall hole, and then the nut is locked in place. The nut pulls the screw outward, while the tapered end fits into the tin cylinder. Once the tin cylinder is opened, it is tightly fixed to the wall. These are commonly used for guardrails, awnings, air conditioning systems, and other applications involving cement, brick, and other materials. However, their fixation is not very reliable; if there is significant vibration under load, they may loosen, so they are not recommended for installing ceiling fans.
<t)_Expansion Screw Anchors consist of a screw, an expansion tube, and other components. The end of the screw is conical. 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 conical part moves along the axial movement of the thread, thereby creating significant positive pressure on the outer surface of the expansion tube. The angle of the cone is very small, which ensures self-locking friction between the wall, the expansion tube, and the cone, thus achieving the fixing effect.
Expansion screw anchors – Anchors are standard components. They are called spring anchors because their openings are split and elastic. Spring anchors are used to insert the nut and pad, utilizing the sharp edge of the split opening to prevent the nut from loosening.
The flat washer is also a standard component. Its function is to evenly distribute the pressure from the nut across all connected parts.
Expansion bolt grades: 45, 50, 60, 70, 80
Material of expansion screw: primary austenite A1, A2, A4
Martensite and ferrite C1 and C2
45 steel, for important or special-purpose threaded connections, can be chosen from 15Cr, 20Cr, 40Cr, 15MnVB, 30CrMrSi, and other alloy steels with higher mechanical properties.
Select different expansion screws depending on the actual condition of the wall. Generally, there are the following types: 6×60, 6×80, 6×120, and 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, and the surface is coated with colored zinc. Screw length is 60 mm, diameter is 6 mm, thread length is 35 mm. The bottom rod hammer is 8 mm in conical shape, and the surface is painted with zinc plating. The nut is octagonal, with an outer diameter of 10 mm and a thickness of 5 mm. The surface is covered with white zinc plating. The gasket has an outer diameter of 13 mm, thickness of 1 mm, inner diameter of 6 mm, and the surface is 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 1.6 mm.
6×80: The total length is 80 mm, the casing length is 65 mm, the diameter is 8 mm, the wall thickness is 0.7 mm, and the surface is coated with colored zinc; Screw length, nut, gasket, shrapnel as described above.
6×120: The total length is 120 mm, the casing length is 105 mm, the diameter is 8 mm, the wall thickness is 0.7 mm, and the surface is coated with colored zinc; Screw length, nut, gasket, shrapnel as described above.
6×150: The total length is 150 mm, the casing length is 135 mm, the diameter is 8 mm, the wall thickness is 0.7 mm, the surface is coated with colored zinc; Screw length, nut, gasket, shrapnel