The Power-Bolt® anchor, is a heavy duty sleeve style, self-locking anchor which is vibration-resistant and removable. It is available with a finished hex head or flat head with a hex key insert and can be used in concrete, block, brick or stone. Expansion occurs at two locations within the drilled hole. First, the cone is pulled into the large triple-tined expansion sleeve, developing a mid level, compression force. Further turning causes the threaded bolt to advance into the threads of the expander cone, forcing its four sections outward. This action engages the base material deep in the anchor hole, greatly increasing the holding power of the Power-Bolt®. The bolt and cone remain locked together which prevents loosening under vibratory conditions. The Power-Bolt® is also designed to draw the fixture into full bearing against the base material through the action of its flexible compression ring. As the anchor is being tightened, the compression ring will crush if necessary to tightly secure the fixture against the face of the base material. The internal bolt of the Power-Bolt® is removable and reusable in the same anchor sleeve making it suitable for applications such as mounting machinery which may need to be removed for service and for temporary applications such as heavy duty form work.