Q235 steel anchor bolts for general use, namely light round. Steel (Q345) strength, do no light threaded nut round easily. For bolt circle of light, the depth is generally 25 times its diameter, and then do a tensile strength of about 90 degrees hook 120mm long bolt itself is round tensile strength, the size of the cross section is equal to area multiplied by the tensile strength of the design value (140MPa) is designed to allow the tension capacity. Q235 steel anchor bolts for general use, namely light round. Currently not seen the thread with the situation, but if the force required is also not a bad idea. Steel (Q345) strength, do no light threaded nut round easily. For bolt circle of light, the depth is generally 25 times its diameter, 120mm long and then do about a 90-degree hook. If the bolt diameter depth too large, it can be welded at the ends of the bolts square plates that make a big head on it (but also have certain requirements). Depth and hooks are designed to ensure that the foundation bolts and friction, and will not pull out the bolt damage occurred. Therefore, the tensile strength bolt itself is round tensile strength, and tensile strength multiplied by the cross-sectional area equal to the size of the design value (140MPa) is designed to allow the tension capacity. Bolt can be divided into fixed bolt, bolt activities, expansion bolt anchor bolt and bonding. 1, also known as short bolt fixing bolt it together with the foundation poured for fixed no strong vibration and shock devices. 2, also known as long bolt bolt activity is a removable bolt for a strong vibration and shock fixed working heavy machinery. 3, expansion anchor bolt for fixing the stand is often a simple device or auxiliary equipment. Expansion anchor bolt installation should meet the following requirements: (1) the bolt from the center to the edge of the base of not less than 7 times the expansion anchor bolt diameter; basic strength (2) expansion anchor bolt installation shall not be less than 10MPa; (3) There shall be no drilling at the crack, and basic care to prevent the drill steel, pipe collisions. 4, is commonly used as a bonding bolt bolt recent years, with the expansion of its methods and requirements for anchor bolt. But note that when bonding the debris blowing holes and not get wet.