A bolt designed for use in roof bolting. It consists of a rod 1-3/4 in (4.45 cm) in diameter with one end threaded and the other end shaped to form a solid wedge. A loose split sleeve with an outside diameter of 1-1/2 in (3.81 cm) is fitted over the wedge. Anchorage is provided when the bolt is pulled downward in a hole and the sleeve is held by a thrust tube. Split by the wedge head of the bolt, the sleeve expands until it grips the sides of the hole. See also: bolt; slot-and-wedge bolt. Nelson Source: Dictionary of Mining, Mineral, and Related Terms
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