Flush-mounted plug for filling a threaded hole

摘要

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