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Bolt materials commonly used materials: carbon steel Q195, Q235, 35K and 45# steel, for important or special purpose thread joints, can choose alloy steel with higher mechanical properties, or choose stainless steel material

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Casing expansion

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Description

Name	Sleeve Type Expansion Anchor Bolts
	Conical Cap Expansion Bolt
	Drop in expansion anchor hex bolts
	leeve Type Expansion Anchor Bolts
Standard	GB /T 22795
Standard	YJT 1003
Size	M6～M24
Length	40mm～300mm
Grade	4.8 5.8 6.8 8.8
Material	(1) Bolt materials commonly used materials: carbon steel Q195, Q235, 35K and 45# steel, for important or special purpose thread joints, can choose alloy steel with higher mechanical properties, or choose stainless steel material (2) The allowable stress of the thread connection is related to the load nature (static and variable load), whether the connection is tightened, whether the pretightening force needs to be controlled, and the material, structure and size of the thread connection.
Surface	Electric galvanizing, hot galvanizing, Dacro
Description	Expansion screw is generally said to be metal expansion screw, expansion screw fixation is to use wedge Angle to promote expansion to produce friction grip force, to achieve the fixed effect. The screw is threaded at one end and taper at the other end. Bread outside a tin (have a plenty of steel tube), iron cylinder (steel tube) half number of incision, put them together into a good hole in the wall, then lock nut and the screw nut to pull, pull taper into the tin drum, tin drum is open, so firmly fixed on the wall, and is generally used in fence, awning, air conditioning, etc on the materials such as cement, brick of fastening. But its fixation is not very reliable, if the load has a large vibration, may occur loose, so it is not recommended for the installation of ceiling fans.
Construction operation technology	The expansion screw consists of a screw and an expansion tube. 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 cone part move, and then forms a lot of positive pressure on the outer surface of the expansion tube. In addition, the Angle of the cone is very small, so that the friction between the wall, the expansion tube and the cone is self-locking, and then achieves the fixing effect. The spring pad on the expansion screw is a standard part, because its opening is staggered and elastic, so it is called the spring washer, the role of the spring washer is to use the sharp Angle of the wrong mouth into the nut and flat pad, prevent the nut loosening. Flat pad is also a standard part, its function is to evenly distribute the nut pressure on the connected parts.
Scope of application	Expansion screw due to small drilling, tension, after use is flat, if not can be removed at will, keep the advantages of wall leveling, widely used in a variety of decoration occasions. It is mainly used in foreign high-end buildings, such as Europe, the United States, the Middle East, Japan and South Korea and other developed countries, and entered the domestic market in 2013. It is widely used for concrete burial related operations. Such as: building curtain wall, interior decoration, air conditioning, lighting, advertising board, TV wall hanging, sanitary ware (kitchenware) water and electricity, monitor and other related industries and fields.
product superiority	1. Wide applicability. As long as the male thread size is consistent, suitable for any type of anchor head. 2. Construction method selection. According to the demand, the fixed point can be preset, or in a single construction in the drilling (installation), its function and effect are completely consistent. High construction success rate. There is no trouble in the depth of the distribution hole and the inclination of the drilling hole, and the construction achievement rate is 100%. 4. High pull design. Full tooth taper expansion special inverted hook design. 5. The lock has anti-loose function. Full tooth taper expansion is specially designed to lock the workpiece with reverse thrust effect. 6. Improve design thinking. Short and concise, suitable for matching all commercial screws, DIY and the best construction optional parts. 7. Ensure anchor expansion. Metal plate pressing products, patent full-tooth taper expansion design, strong grasping ability, no idling, no need for professional construction skills. 8. There is no trouble in disposing. As long as the anchor workpiece is removed, the filling agent is applied to restore the plane, without removal trouble and protruding object collision risk.

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