# US 9,517,519 B2 · Fastener with hardened threads > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,517,519 B2 - Document ID: US9517519B2 - Status: Granted - Kind: B2 - Application number: 14/297,308 - Filed: 2014-06-05 - Published: 2014-12-04 - Granted: 2016-12-13 - Earliest claimed: 2009-11-18 - Assignees: Simpson Strong-Tie Company, Inc. - Applicants: Simpson Strong-Tie Company, Inc. - Inventors: Gerald W. Hagel; Joel Houck - Web page: https://patentgrep.com/patent/US9517519B2 ## CPC - B23G 7/02: Tools for this purpose - F16B 25/00: Screws that cut thread in the body into which they are screwed, e.g. wood screws {(F16B35/065 takes precedence; joining sheets or plates using screws with two separate threads F16B5/0275, using screws with adjustment sleeves F16B5/0283)} - F16B 25/0026: {the material being a hard non-organic material, e.g. stone, concrete or drywall (F16B25/0031 takes precedence)} - F16B 25/0047: {the ridge being characterised by its cross-section in the plane of the shaft axis} - F16B 25/0052: {the ridge having indentations, notches or the like in order to improve the cutting behaviour} - F16B 25/0094: {the screw being assembled or manufactured from several components, e.g. a tip out of a first material welded to shaft of a second material} - F16B 33/008: {Corrosion preventing means} - B23G: THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH (making helical grooves by turning B23B5/48, by milling B23C3/32, by forging, pressing, or hammering B21K1/56, by grinding B24B19/02; arrangements for copying or controlling B23Q; thread-forming by corrugating tubes B21D15/04, by rolling B21H3/02) - F16B: DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING (couplings for transmitting rotation F16D) ## Abstract A method of creating a threaded fastener which includes a shank having a first, threaded portion and a hardened thread portion. The shank includes a thread extending outwardly from a shank body over a first length of the shank. A second portion of the shank includes a groove positioned coincident with the thread and including a turn ratio equal to a turn ratio of the thread. The shank comprises corrosive resistant stainless steel. A coil of hardened steel engages the groove to fill the groove along the second portion. ## Claims ### Claim 1 A method for manufacturing a corrosion resistant, self-drilling fastener, comprising: forming a shank having a threaded portion and a channel, the threaded portion including a thread extending outwardly from the shank and having a turn profile, the channel formed with a trapezoidal cross-section having at least one turn about the shank matching the turn profile and extending from the thread toward an end of the shank, the shank comprising a corrosion resistant material; and attaching a coil of a carbon steel material in the channel. ### Claim 2 (depends on 1) The method of claim 1 including hardening the coil prior to said attaching. ### Claim 3 (depends on 2) The method of claim 2 wherein attaching comprises mechanically attaching the coil to the shank. ### Claim 4 (depends on 1) The method of claim 1 including hardening the coil after said attaching. ### Claim 5 (depends on 4) The method of claim 4 therein said hardening comprises induction heating followed by quenching. ### Claim 6 A method for manufacturing a fastener, comprising: forming a shank having a threaded portion and a channel, the threaded portion including a thread extending outwardly from the shank and having a turn profile, the channel having at least one turn matching the turn profile and extending from the thread toward an end of the shank, the channel having a trapezoidal cross-sectional profile; and attaching a coil of a steel material in the channel. ### Claim 7 (depends on 6) The method of claim 6 wherein said forming comprises rolling said threaded portion. ### Claim 8 (depends on 7) The method of claim 7 wherein said forming includes creating cutting teeth in said thread. ### Claim 9 (depends on 8) The method of claim 8 further including hardening the coil prior to attaching the coil in the channel. ### Claim 10 (depends on 8) The method of claim 8 further including hardening the coil after attaching the coil in the channel. ### Claim 11 (depends on 6) The method of claim 6 wherein the attaching is performed by an adhesive. ### Claim 12 (depends on 8) The method of claim 8 wherein a hardening is applied to the coil by heating the coil following by quenching the coil prior to attaching the coil to the shank. ### Claim 13 (depends on 6) The method of claim 6 wherein attaching includes rolling an edge of the channel against the coil. ### Claim 14 A method for manufacturing a fastener, comprising: rolling a fastener blank of a first steel material against a die to create a threaded portion and a channel in the blank, the threaded portion including a thread extending outwardly from the shank and having a turn profile, the channel having at least one turn matching the turn profile and extending from the thread toward an end of the shank; and hardening a coil of a second steel material; and attaching the coil in the channel. ### Claim 15 (depends on 14) The method of claim 14 wherein the hardening occurs prior to attaching. ### Claim 16 (depends on 15) The method of claim 15 wherein the hardening occurs subsequent to attaching. ### Claim 17 (depends on 16) The method of claim 16 further including forming the channel to a depth, forming the coil to have a first section engaging the depth of the channel, the first section having a depth less than the depth of the channel. ### Claim 18 (depends on 17) The method of claim 17 further including forming the coil to have a thread section having a height, a portion of the height extending into the channel. ### Claim 19 (depends on 18) The method of claim 18 wherein attaching includes rolling an edge of the channel against the thread section to secure the coil. ### Claim 20 (depends on 16) The method of claim 16 further including forming cutting teeth in the coil.