# US 10,767,678 B2 · Fastening member and rod-shaped member for fastening member > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,767,678 B2 - Document ID: US10767678B2 - Status: Granted - Kind: B2 - Application number: 15/752,401 - Filed: 2016-08-26 - Published: 2019-01-03 - Granted: 2020-09-08 - Earliest claimed: 2015-08-28 - Assignees: NHK Spring Co., Ltd. - Applicants: NHK Spring Co., Ltd. - Inventors: Toshio Kazama; Noriyoshi Kaneda; Shun Hirai - Web page: https://patentgrep.com/patent/US10767678B2 ## CPC - F16B 19/06: Solid rivets made in one piece - C22C 21/10: with zinc as the next major constituent - C22C 21/16: with magnesium - F16B 33/06: Surface treatment of parts furnished with screw-thread, e.g. for preventing seizure {or fretting (corrosion preventing means F16B33/008; settable coatings for locking threaded members F16B39/225; deformable coatings for locking threaded members F16B39/34)} - F16B 35/04: with specially-shaped head or shaft in order to fix the bolt on or in an object (locking the bolt against turning in the object by the use of accessory parts F16B39/00) - F16B 35/048: {Specially-shaped necks (F16B35/06 takes precedence)} - F16B 37/00: Nuts or like thread-engaging members {(specially shaped for rotations by a tool F16B23/00)} - F16B 37/005: {into which threads are cut during screwing} - F16B 33/02: Shape of thread; Special thread-forms ({F16B25/00 takes precedence; used to remove paint or dirt layers F16B35/007, F16B37/002}; used as screw-locking device F16B39/30) - F16B 37/14: Cap nuts; Nut caps or bolt caps - 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) - C22C: ALLOYS (treatment of alloys C21D, C22F) ## Abstract A fastening member includes: a first alloy section made of aluminum alloy containing zinc in an amount of 0.005 wt % or more and 6.5 wt % or less and containing magnesium in an amount of 0.6 wt % or more and 2.0 wt % or less, and provided at a portion being in contact with at least one of the plurality of members; and a second alloy section made of an aluminum alloy containing magnesium in an amount of greater than 0.2 wt % and 2.3 wt % or less and containing copper in an amount of greater than 1.0 wt % and 8.0 wt % or less, and bonded to the first alloy section. ## Claims ### Claim 1 A fastening member that fastens members, the fastening member comprising: a first alloy section made of aluminum alloy containing zinc in an amount of 0.005 wt % or more and 6.5 wt % or less and containing magnesium in an amount of 0.6 wt % or more and 2.0 wt % or less, is the first alloy section being provided in a portion in contact with at least one of the members; and a second alloy section made of an aluminum alloy containing magnesium in an amount of greater than 0.2 wt % and 2.3 wt % or less and containing copper in an amount of greater than 1.0 wt % and 8.0 wt % or less, the second alloy section being bonded to the first alloy section. ### Claim 2 (depends on 1) The fastening member according to claim 1, wherein Vickers hardness of the second alloy section is 130 or more. ### Claim 3 (depends on 1) The fastening member according to claim 1, wherein a screw thread is formed in a part of a surface of the first alloy section. ### Claim 4 (depends on 3) The fastening member according to claim 3, wherein the fastening member is a male screw including: a cylindrical shaft section with the screw thread formed in at least a part of the outer periphery; a head section provided at one end of the shaft section in an axial direction; and a neck section demarcating a boundary between the shaft section and the head section, the first alloy section constitutes at least a surface layer portion of the screw thread, a surface of the neck section and a surface layer portion of a seating surface of the head section, and a thickness of the surface layer portion of the screw thread of the first alloy section in the radial direction is 1/2000 or more and 1/10 or less of a maximum outer diameter of the shaft section. ### Claim 5 (depends on 3) The fastening member according to claim 3, wherein the fastening member is a female screw with the screw thread formed on an inner surface of a hole formed in a center portion, the second alloy section is located on an outer peripheral side of the first alloy section, and a Thickness of the First Alloy Section in the Radial Direction is 1/2000 or more and 1/10 or less of a maximum outer diameter of the female screw. ### Claim 6 (depends on 1) The fastening member according to claim 1, wherein the fastening member is a rivet including: a cylindrical shaft section; a head section provided at one end portion of the shaft section in the axial direction; and a neck section demarcating a boundary between the shaft section and the head section, the first alloy section constitutes at least a surface layer portion of the shaft section, a surface of the neck section and a surface layer portion of a seating surface of the head section, and a thickness of the first alloy section in the radial direction of the shaft section is 1/2000 or more and 1/10 or less of an outer diameter of the shaft section. ### Claim 7 A rod-shaped member for a fastening member, comprising: a core section having a cylindrical shape and made of an aluminum alloy containing magnesium in an amount of greater than 0.2 wt % and 2.3 wt % or less and copper containing in an amount of greater than 1.0 wt % and 8.0 wt % or less; and an outer peripheral portion having a hollow cylindrical shape covering a side surface of the core section with no gap, and made of an aluminum alloy containing zinc in an amount of 0.005 wt % or more and 6.5 wt % or less and containing magnesium in an amount of 0.6 wt % or more and 2.0 wt % or less. ### Claim 8 (depends on 7) The rod-shaped member for a fastening member according to claim 7, wherein a thickness of the outer peripheral portion in the radial direction is 1/2000 or more and 1/10 or less of a maximum outer diameter of the outer peripheral portion. ### Claim 9 A rod-shaped member for a fastening member, comprising: a core section having a hollow cylindrical shape and made of an aluminum alloy containing zinc in an amount of 0.005 wt % or more and 6.5 wt % or less and containing magnesium in an amount of 0.6 wt % or more and 2.0 wt % or less; and an outer peripheral portion having a hollow cylindrical shape covering a side surface of the core section with no gap, and made of an aluminum alloy containing magnesium in an amount of greater than 0.2 wt % and 2.3 wt % or less and containing copper in an amount of greater than 1.0 wt % and 8.0 wt % or less. ### Claim 10 (depends on 9) The rod-shaped member for a fastening member according to claim 9, wherein a thickness of the core section in the radial direction is 1/2000 or more and 1/10 or less of a maximum outer diameter of the outer peripheral portion.