Introduction to High strength external hexagon combination screw for buildings and workshops:
High strength external hexagon combination bolt for steel structure is mainly used in railway and highway bridge, boiler steel structure, industrial workshop, high-rise civil building, tower and mast structure, hoisting machinery and steel structure where friction type high-strength bolt combination screw is required. The feature of the combination screw is that the end of the bolt has an extra dodecagonal body.
Installation of High strength external hexagon combination bolt for buildings and workshops:
When installing the external hexagon combination screw, a special electric wrench must be used. There are two socket heads at the top and bottom, one on the hexagon of the nut and the other on the decagonal body of the external hexagon combination screw. When tightening, apply a clockwise force distance to the nut and an equal counter clockwise force distance to the dodecagonal body of the bolt, so that the connection neck between the end of the external hexagon combination screw and the dodecagonal body is subject to torsional shear until the neck is cut off, and the installation is finished. This kind of high strength external hexagon combination screw is a kind of one-time screw, which can not be removed after installation.
ANSI A325 Heavy Hex Bolt, A307B Zinc Galvanized ASTM A325 A490 B7 B8 Heavy Hex Hexagon Head Bolt, Stock ASTM A193 GR B7 Heavy Hex Bolt High Tensile Black Heavy Hex Bolt ASTM A325 A490 Standard No.: A325, A325m, A490, A490m, A193, etc Specification size: diameter m10-m52, length 25-500mm Surface treatment: Black Fastener manufacturer DOWEDO […]