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A resin flush-mounted plug (11) for insertion into an internally threaded hole (1) with a countersink (2) formed in a pallet of a machine tool has a head (12) for filling the countersink (2) of the threaded hole (1) and a pair of legs (13) formed integrally with the head (12) for fitting into an int

A resin flush-mounted plug (11) for insertion into an internally threaded hole (1) with a countersink (2) formed in a pallet of a machine tool has a head (12) for filling the countersink (2) of the threaded hole (1) and a pair of legs (13) formed integrally with the head (12) for fitting into an internally threaded portion (3) of the threaded hole (1). The head (12) has a tapered under surface (12a) for filling the countersink (2) of the threaded hole (1). Also provided in the head (12) is a slot (12b), a hexagonal hole, or some other recess for accommodating a screwdriver blade, a wrench, or some other appropriate tool used to remove the flush-mounted plug (11). The legs (13) project outward radially from the underside of the head (12). The outer peripheral surfaces of the fixed ends of the legs (13) to the head (12) are arranged on a circumference whose diameter is smaller than the inner diameter C of the internally threaded portion (3) (A

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[ What is claimed is:] [1.] A combination comprising:a surface having a countersunk hole formed therein, the countersunk hole having an internally threaded portion formed by a plurality of threads, anda resin flush-mounted plug for insertion into the countersunk hole, the plug includinga head for fi

[ What is claimed is:] [1.] A combination comprising:a surface having a countersunk hole formed therein, the countersunk hole having an internally threaded portion formed by a plurality of threads, anda resin flush-mounted plug for insertion into the countersunk hole, the plug includinga head for filling the countersink of the hole, the head having a recess formed therein for accommodating a tool used to remove the plug from the countersunk hole; anda plurality of legs integrally formed with the head for fitting into the internally threaded portion of the countersunk hole, each of the legs having a fixed end and a free end, wherein the outer peripheral surfaces of the fixed ends of the legs are arranged on a circumference whose diameter is smaller than the inner diameter of the internally threaded portion of the countersunk hole while the outer peripheral surfaces of the free ends of the legs are arranged on a circumference whose diameter is larger than the inner diameter of the internally threaded portion and smaller than the outer diameter of the countersink of the hole, the threads forming the threaded portion of the countersunk hole having a hardness sufficient to cut threads in the resin legs as the plug is rotated by the tool.