A plug having a tapered thread extending its entire length and designed to provide a flush condition with a standard tapped hole. Both ends of the plug shall be flat and approximately 45 degrees. Six equally spaced identification grooves are located between corners of the hex socket. Application: A high pressure seal is achieved through the difference in taper, with dimensions pre-calculated to provide a higher sealing load near the large end of the plug and the threads near the top of the tapped hole. The flush type plug is preferred where high pressures are encountered and where protrusion is undesirable.
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