# US 8,770,903 B2 · Thread-producing nut, blank for the fabrication of said nut, and bolted joint composed of said nut and a bolt > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,770,903 B2 - Document ID: US8770903B2 - Status: Granted - Kind: B2 - Application number: 13/883,703 - Filed: 2011-11-08 - Published: 2013-08-29 - Granted: 2014-07-08 - Earliest claimed: 2010-11-08 - Assignees: Baier & Michels GmbH & Co. KG - Applicants: Olaf Ambros - Inventors: Olaf Ambros - Web page: https://patentgrep.com/patent/US8770903B2 ## CPC - F16B 37/002: {cutting threads during screwing; removing paint or dirt layers covering threaded shanks} - B21D 53/24: nuts or like thread-engaging members - 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) - B21D: WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL (working or processing of wire B21F) ## Abstract A thread-producing nut for a screwed connection, wherein a core hole which is provided with thread turns is designed for positively locking, frictionally locking and releasable connection to an, in particular, cylindrical bolt or pin, in such a way that the thread turns have completely formed thread turns in certain sections when viewed in the circumferential direction and that free spaces with thread turns which are formed incompletely in terms of their height are provided between the completely formed sections of the thread turns. Furthermore, a blank for manufacturing the nut and a screwed connection composed of such a nut and a bolt are disclosed herein. ## Claims ### Claim 1 A thread-foaming nut for positive, nonpositive and releasable connection to a stud or bolt, the thread-forming nut comprising: a core hole provided with load-bearing thread turns and the thread turns are disposed on a peripheral surface of the core hole in a peripheral direction, wherein the thread turns, as regarded in the peripheral direction, partially comprise perfectly formed thread turns, wherein between perfectly formed regions of the thread turns there are provided free spaces comprising in terms of height imperfectly formed thread turns and wherein the load-bearing thread turns in the core hole lie at their roots on a minor thread diameter (Dn) and at their crests on a major thread diameter (D1), wherein the thread turns comprise, at least in part, free spaces that widen the core hole from the major thread diameter (Dn) towards the minor thread diameter (D1), and wherein the free spaces terminate at a distance from the minor thread diameter (D1) on an outer circle diameter (Da). ### Claim 2 (depends on 1) The nut according to claim 1, wherein the thread turns have a pitch diameter D2 situated between the minor thread diameter (Dn) and the major thread diameter (D1) and wherein the outer circle diameter (Da) is smaller than the minor thread diameter (Dn) and is at least as large as the pitch diameter (D2). ### Claim 3 (depends on 2) A bolted joint, comprising a nut according to claim 2 and a bolt, wherein a diameter (d2) of the bolt is larger than the major thread diameter (D1) and smaller than the outer circle diameter (Da) of the nut and is more particularly as large as the pitch diameter (D2). ### Claim 4 (depends on 3) The bolted joint according to claim 3, wherein the outer circle diameter Da of the nut is larger than the diameter (d2) of the bolt. ### Claim 5 (depends on 1) The nut according to claim 1, wherein the free spaces are in the form of an arc of a circle having a radius (Rv) and wherein the radius (Rv) is smaller than approximately 35% of the major thread diameter (D1), wherein the free space comprises a center that is displaced from a center of the core hole by not more than approximately 75% of the major thread diameter (D1). ### Claim 6 (depends on 5) The nut according to claim 5, wherein the radius (Rv) is smaller than approximately 25% of the major thread diameter (D1). ### Claim 7 (depends on 1) The nut according to claim 1, wherein transition of a free space to the major thread diameter (D1) occurs at an angle of from approximately 120° to less than approximately 180°. ### Claim 8 (depends on 1) The nut as defined in claim 1, wherein proportion of the free spaces in the thread turns is between approximately 20% and approximately 75%. ### Claim 9 (depends on 1) An unfinished part for the fabrication of a thread-forming nut according to claim 1, wherein the nut to be fabricated is to be provided with a thread having a major thread diameter (D1) and a minor thread diameter (Dn), wherein the unfinished part comprises a core hole having an inner circle diameter (Di) smaller than the major thread diameter (D1) to be fabricated and wherein the core hole comprises free spaces that widen the core hole away from the inner circle diameter (Di), wherein the free spaces terminate at a distance from the minor thread diameter (Dn) to be fabricated on an outer circle diameter (Da). ### Claim 10 (depends on 9) The unfinished part according to claim 9, wherein the free spaces are spaced at intervals. ### Claim 11 (depends on 1) The nut according to claim 1, wherein the stud or bolt is a cylindrical stud or bolt.