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SF series of cold-formed steel is processed by the hot coil, thin wall, light weight, excellent performance of cross-section, high strength, good load capacity, compared with the traditional channel. It can save 30% as the same strength. It’s widely used in steel building purline, wall beams and can replace the traditional construction lifting angle. It can also be combined into a own composite panels lightweight roof trusses, shelves, brackets and other building components. Steel itself for a P-type, PSC-tube clamp, bundle can arbitrarily positioned in the longitudinal direction. In addition, it can also be used in the columns, beams, and arm of light manufacturing machine. Steel construction is simple, time-saving and labor, and light weight. Length can be according to customer’s requirements .It can be connected into different combinations with a variety of accessories. Features: Crimping jagged, effective shear, slip, shock; free solder, drill-free, easy to construct. Features: 1 using both sides of the beading to improve flexural strength and stiffness; 2. Both sides of the rib edge pressure varus teeth, teeth together with coupling nut machine to increase the sliding coefficient.