Blue Hot Show Cement Screws are high-strength alloy steel self-tapping and self-drilling screws with a blue coating, primarily used for fastening concrete and cement-based substrates. Essentially, they are high-hardness self-tapping and self-drilling screws that can directly drill holes and form threads in concrete, achieving a one-time "drilling, tapping, and tightening" process.
The blue (or a specific color coating, such as epoxy resin or polyester coating) often indicates a specific corrosion resistance level or performance series.
Cement screws are made of alloy steel and undergo heat treatment (quenching and tempering) to achieve extremely high surface hardness and core toughness.
Their wide-pitch, deep threads provide strong engagement force and pull-out resistance.
The thread's special feature: sharp thread edges facilitate cutting and forming internal threads in concrete.
The head type is typically a hexagonal flange head, allowing for the application of high torque with socket wrenches or electric impact wrenches, and the flange face provides a larger bearing area.
Working Principle
Positioning and Drilling: Driven by an electric impact drill or specialized installation tools, the hardened drill bit at the screw tip rotates at high speed, impacting and drilling a guide hole in the concrete, much like a drill bit.
Tapping and Tightening: As the screw continues to screw in, the high-strength threads press and cut a matching internal thread against the concrete hole wall, forming a tight mechanical engagement.
Final Locking: The hexagonal flange face presses against the fixed object (such as steel plate or timber), completing the entire tightening process.
Application Scenarios
Connecting Light Steel Keel to Concrete: Used to fix partition wall keels and ceiling keels to concrete floor slabs or walls.
External Wall Insulation Systems: Anchors for fixing insulation boards (such as EPS/XPS).
Electrical and Mechanical Pipeline Support Installation: Directly fixing angle steel, supports, etc., to concrete beams, columns, and slabs.
Wooden Structure Bottom Connection: Fixing wooden floor beams and wooden wall keels to a concrete foundation.
Fixing Fence and Railing Posts.
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