Self-threading bolt

Details Self-threading bolt Self-threading bolt

1989-01-24

1991-03-19

Wilson, Neill R.

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Externally threaded fastener element, e.g., bolt, screw, etc.

Thread or shank structure

411386, F16B 3504

Patent

active

050006398

ABSTRACT:
A self-tapping and threading bolt to replace bolts when the bolt holes have damaged or stripped threads. The self-tapping bolt has a self-tapping tapered end which is small enough to fit in the bolt hole into which it is inserted. It has two slots cut into the end which provides both channels for disposal of chips and to define the cutting edge of the self-tapping portion. The cutting edge of the self-tapping portion is decreased in radius behind the cutting edge to provide a relief so that the bolt can be turned with less torque into the damaged bolt hole.

REFERENCES:
patent: 2093171 (1937-09-01), Olson
patent: 2093172 (1937-09-01), Olson
patent: 2165010 (1939-07-01), Rosenberg
patent: 2278411 (1942-04-01), Braendel
patent: 2572647 (1951-10-01), Merwin
patent: 2823574 (1958-02-01), Rosan

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