CONCRETE SCREW, also called as window frame screw.
Material: 1022 steel
Size: 7.5mm diameter
Length: from 42mm to 212mm.
Processing: case harden on the surface.
Finish: zinc plated yellow or white.
Head type:Torx-30 Countersunk
Packing: small box by 100 pcs then into cartons and pallet
Supply ability per month: 200 tons.
Concrete screws, also called anchor screws, are designed for quick, safe, secure fastening for a variety of jobs in concrete, brick and cinder block/masonry. They are an externally threaded, hardened screw with a double lead, consisting of alternating raised and lowered threads with notches cut into the threads, and a diamond-shaped, nail type point. Concrete screws eliminate the need for an anchor when used in light and medium duty applications. When used in concrete, anchor screws can be removed and re-driven into the same hole. Special carbide bits are recommended for driving concrete screws into masonry. Concrete anchor screws provide self-threading action and maximum holding power for anchoring the following to masonry: electrical junction boxes, wooden beams, plywood, exterior insulation, metal flashing, expansion joints, duct straps, gutters, fixtures, and thresholds. Concrete screws are available in two different head styles: flat head and hex head. Flat head screws have a phillips drive style, while the hex head can be a slotted or unslotted indented hex head style.