Method of tapping dual thread fasteners
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United States of America Patent
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Jun 21, 1983
Grant Date -
N/A
app pub date -
Aug 31, 1981
filing date -
Aug 31, 1981
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An internally threaded fastener, such as a nut, includes a body having an axially extending opening with a side wall. A coarse internal thread convolution is formed in the side wall of the nut body. A fine thread convolution is also formed in the side wall of the nut body. The turns of the coincident coarse and fine thread convolutions are intermingled to enable them to engage a fastener having either a coarse or a fine external thread. An improved tap has a first section for forming the fine thread convolution and a second section for forming the coarse thread convolution. The two sections of the tap are interconnected in a coaxial relationship by a connector section having an axial extent which is less than the axial extent of the coincident coarse and fine thread convolutions. When a plurality of nuts are to be tapped, the fine thread convolution is tapped first. This enables a leading nut to be moved away from a following nut during tapping of a coarse thread convolution in the leading nut and the tapping of a coarse thread convolution in the following nut.
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