Concrete Screw Bolts are one-piece, heavy duty mechanical anchors with a finished hex head. The anchor is manufactured from carbon steel and is heat treated. The anchor is manufactured from carbon steel and is heat treated. The Sure-Boltâ„¢ is available in a variety of sizes from 1/4 to 3/4 inch. The hex head diameter is larger than the diameter of the anchor and is formed with serrations on the underside. The anchor can be installed in a pre-drilled hole with a powered impact wrench or a torque wrench. The anchor threads cut into concrete on the sides of the hole and interlock with the base material during the installation. Once installed they are easily identifiable by head markings with ASF on the head. Suitable base materials include normal weight concrete, and lightweight concrete. The anchor is designed for consistent and reliable performance in cracked and uncracked concrete
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