Наружный геккон

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 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 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