A building structure including a first building member and a second building member may be connected by a plurality of fasteners, each fastener having a head, a threaded portion having a through hardness of between HRB 70 and HRC 40, a thread-forming portion of at least HRC 50 hardness enabling the
A building structure including a first building member and a second building member may be connected by a plurality of fasteners, each fastener having a head, a threaded portion having a through hardness of between HRB 70 and HRC 40, a thread-forming portion of at least HRC 50 hardness enabling the fastener to form threads in at least the second steel building member, and a fluted lead portion of at least HRC 50 hardness with a nominal diameter between 70 and 95% of major diameter, such that the fastener is capable of providing a ratio of strip torque to thread-forming torque of at least 2.7 and a ratio of strip torque to drive torque greater than 6.0 when the second steel building member having a thickness of 0.25 inch and the fluted lead portion having at least one diameter within nominal diameter between 80 and 98% of major diameter.
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1. A building structure comprising: a first steel building member and a second steel building member connected by a plurality of fasteners,each fastener being steel comprising a head capable of clamping the first steel building member to the second steel building member with the fastener installed,a
1. A building structure comprising: a first steel building member and a second steel building member connected by a plurality of fasteners,each fastener being steel comprising a head capable of clamping the first steel building member to the second steel building member with the fastener installed,a threaded portion adjacent the head,a thread-forming portion adjacent the threaded portion of at least HRC 50 hardness adapted to form threads into at least the second steel building member, anda fluted lead portion adjacent the thread-forming portion of at least HRC 50 hardness with a nominal diameter in a range from 60% to 95% of major diameter of the threaded portion adapted to form a fastener opening, such that the fastener is capable of providing a ratio of strip torque to thread-forming torque of at least 2.7 and a ratio of strip torque to drive torque greater than 6.0 over a range of combined thickness of first and second steel building members from about 0.036 inch to 0.084 inch. 2. The building structure of claim 1 where the thread-forming portion of the fasteners include a series of lobes with recesses between about the rotational axis, each lobe having a leading portion and a tailing portion, the leading portion and first adjacent recess at a first angle in a range from 50° to 100° from a plane tangent to the lobe adjacent the leading portion, and the tailing portion and second adjacent recess at a second angle in a range from 25° to 50° from a plane tangent to the lobe adjacent the tailing portion, where the first angle is greater than the second angle. 3. The building structure of claim 1 where the ratio of strip torque to thread-forming torque is at least 2.7 and a ratio of strip torque to drive torque greater than 8.0 over a range of combined thickness of first and second steel building members from about 0.036 inch to 0.084 inch. 4. The building structure of claim 1 where the ratio of strip torque to thread-forming torque is at least 2.7 and a ratio of strip torque to drive torque greater than 6.0 over a range of combined thickness of first and second steel building members from about 0.036 inch to 0.108 inch. 5. The building structure of claim 1, where the threaded portion adjacent the head has a through hardness in a range from HRB 70 and HRC 40. 6. The building structure claimed in claim 5, where the fasteners have up to five threads between the threaded portion and the thread-forming portion hardened to at least HRC 50 hardness. 7. The building structure of claim 1, where the threaded portion adjacent the head has a case hardness of at least HRC 50. 8. The building structure claimed in claim 1, where the fasteners are nutable. 9. The building structure claimed in claim 1, where the combined thickness of the first steel building member and the second steel building member at the fastener is no more than 0.125 inch in thickness. 10. The building structure claimed in claim 1, where the fluted lead portion has a nominal diameter in a range from 62% to 85% of major diameter. 11. The building structure claimed in claim 1, where the thread-forming portion has a shape selected from a group consisting of quadlobular and pentalobular. 12. The building structure claimed in claim 1, where the lead portion of the fluted lead portion has a milled point. 13. The building structure claimed in claim 1, where the fluted lead portion has at least HRC 50 induction hardness. 14. The building structure claimed in claim 1, where the threaded portion has less than 60° thread angle and back-tapered threads. 15. The building structure claimed in claim 1, where the threaded portion has from 45 to 50° thread angle and back-tapered threads. 16. The building structure claimed in claim 1, where the thread-forming portion is from 3 to 7 thread pitch in length. 17. The building structure claimed in claim 1, the threaded portion comprising a major diameter extending to within 1.5 of the thread pitch of the head. 18. The building structure claimed in claim 17, where the head of the fasteners are undercut and adapted to deform the first steel building member on tightening of the fasteners. 19. The building structure claimed in claim 1, where a sealing member is positioned between the head and the threaded portion. 20. The building structure claimed in claim 1, where serrations are provided in the underside of the head. 21. The building structure of claim 1 where the ratio of strip torque to thread-forming torque is at least 3.0 and a ratio of strip torque to drive torque greater than 6.0 over a range of combined thickness of first and second steel building members from about 0.036 inch to 0.084 inch. 22. A building structure comprising: a first steel building member and a second steel building member connected by a plurality of fasteners,each fastener being steel comprising a head capable of clamping the first steel building member to the second steel building member with the fastener installed,a threaded portion adjacent the head,a thread-forming portion adjacent the threaded portion of at least HRC 50 hardness adapted to form threads into at least the second steel building member, anda fluted lead portion adjacent the thread-forming portion of at least HRC 50 hardness with a nominal diameter in a range from 60% to 95% of major diameter of the threaded portion adapted to form a fastener opening, such that the fastener is capable of providing a ratio of strip torque to thread-forming torque of at least 3.5 and a ratio of strip torque to drive torque greater than 8.0 over a range of combined thickness of first and second steel building members from about 0.054 inch to 0.084 inch. 23. The building structure of claim 22 where the ratio of strip torque to thread-forming torque is at least 3.5 and a ratio of strip torque to drive torque greater than 10.0 over a range of combined thickness of first and second steel building members from about 0.054 inch to 0.084 inch. 24. The building structure of claim 22 where the ratio of strip torque to thread-forming torque is at least 3.5 and a ratio of strip torque to drive torque greater than 6.0 over a range of combined thickness of first and second steel building members from about 0.036 inch to 0.084 inch. 25. The building structure of claim 22 where the ratio of strip torque to thread-forming torque is at least 3.5 and a ratio of strip torque to drive torque greater than 8.0 over a range of combined thickness of first and second steel building members from about 0.036 inch to 0.084 inch. 26. The building structure of claim 22 where the ratio of strip torque to thread-forming torque is at least 3.0 and a ratio of strip torque to drive torque greater than 4.0 over a range of combined thickness of first and second steel building members from about 0.036 inch to 0.108 inch. 27. The building structure of claim 22 where the ratio of strip torque to thread-forming torque is at least 4.0 and a ratio of strip torque to drive torque greater than 8.0 over a range of combined thickness of first and second steel building members from about 0.054 inch to 0.084 inch. 28. The building structure of claim 22, where the threaded portion adjacent the head has a through hardness in a range from HRB 70 to HRC 40. 29. The building structure claimed in claim 28, where the fasteners have up to five threads between the threaded portion and the thread-forming portion hardened to at least HRC 50 hardness. 30. The building structure of claim 22, where the threaded portion adjacent the head has a case hardness of at least HRC 50. 31. The building structure claimed in claim 22, where the fasteners are nutable. 32. The building structure claimed in claim 22, where the combined thickness of the first steel building member and the second steel building member at the fastener is no more than 0.125 inch in thickness. 33. The building structure claimed in claim 22, where the fluted lead portion has a nominal diameter in a range from 62% to 85% of major diameter. 34. The building structure claimed in claim 22, where the thread-forming portion has a shape selected from a group consisting of quadlobular and pentalobular. 35. The building structure claimed in claim 22, where the lead portion of the fluted lead portion has a milled point. 36. The building structure claimed in claim 22, where the fluted lead portion has at least HRC 50 induction hardness. 37. The building structure claimed in claim 22, where the threaded portion has less than 60° thread angle and back-tapered threads. 38. The building structure claimed in claim 22, where the threaded portion has from 45 to 50° thread angle and back-tapered threads. 39. The building structure claimed in claim 22, where the thread-forming portion is from 3 to 7 thread pitch in length. 40. The building structure claimed in claim 22, the threaded portion comprising a major diameter extending to within 1.5 of the thread pitch of the head. 41. The building structure claimed in claim 40, where the head of the fasteners are undercut and adapted to deform the first steel building member on tightening of the fasteners. 42. The building structure claimed in claim 22, where a sealing member is positioned between the head and the threaded portion. 43. The building structure claimed in claim 1, where serrations are provided in the underside of the head. 44. A building structure comprising: a first steel building member and a second steel building member connected by a plurality of fasteners,each fastener being steel comprisinga head capable of clamping the first steel building member to the second steel building member with the fastener installed,a threaded portion adjacent the head having a through hardness in a range from HRB 70 to HRC 40,a thread-forming portion adjacent the threaded portion of at least HRC 50 hardness adapted to form threads in at least the second steel building member, anda fluted lead portion adjacent the thread-forming portion of at least HRC 50 hardness with a nominal diameter in a range from 75% to 95% of major diameter of the threaded portion adapted to form a fastener opening, such that the fastener is capable of providing a ratio of failure torque to thread-forming torque of at least 3.0 and a ratio of failure torque to drive torque greater than 6.0 over a range of combined thickness of first and second steel building members from about 0.10 inch to 0.47 inch. 45. The building structure claimed in claim 44, where the fasteners are capable of providing a ratio of failure torque to thread-forming torque of at least 3.75. 46. The building structure claimed in claim 44, where the fasteners have a drive torque no more than 50% of a thread-forming torque. 47. The building structure claimed in claim 44, where the fasteners have up to five threads between the threaded portion and the thread-forming portion hardened to at least HRC 50 hardness. 48. The building structure claimed in claim 44, where the fasteners are nutable. 49. The building structure claimed in claim 44, where the lead portion of the fluted lead portion has a milled point. 50. The building structure claimed in claim 44, where the thread-forming portion has a shape selected from a group consisting of quadlobular, pentalobular, and hexalobular. 51. The building structure claimed in claim 44, where the fluted lead portion has at least HRC 50 induction hardness. 52. The building structure claimed in claim 44, where the threaded portion has less than 60° thread angle and back-tapered threads. 53. The building structure claimed in claim 44, where the threaded portion has from 45 to 50° thread angle and back-tapered threads. 54. The building structure claimed in claim 44, where the thread-forming portion is from 3 to 7 thread pitches in length. 55. A building structure comprising: a first steel building member and a second steel building member connected by a plurality of fasteners,each fastener being steel comprising a head capable of clamping the first steel building member to the second steel building member with the fastener installed,a threaded portion adjacent the head having a through hardness in a range from HRB 70 to HRC 40,a thread-forming portion adjacent the threaded portion of at least HRC 50 hardness adapted to form threads in at least the second steel building member, anda fluted lead portion adjacent the thread-forming portion of at least HRC 50 hardness with a nominal diameter in a range from 80 to 92% of major diameter of the threaded portion adapted to form a fastener opening, such that the fastener is such that the fastener is capable of providing a ratio of failure torque to thread-forming torque of at least 3.0 and a ratio of failure torque to drive torque greater than 10 when the second steel building member having a thickness of 0.25 inch. 56. The building structure claimed in claim 55, where the fasteners are capable of providing a ratio of failure torque to thread-forming torque of at least 3.0 and a ratio of failure torque to drive torque greater than 10 over a range of second steel building member thickness from 0.25 inch to 0.47 inch. 57. The building structure claimed in claim 56, where the fasteners are nutable. 58. The building structure claimed in claim 56, where the fasteners have a drive torque no more than 50% of a thread-forming torque. 59. The building structure claimed in claim 56, where the fasteners have up to five threads between the threaded portion and the thread-forming portion hardened to at least HRC 50 hardness. 60. The building structure claimed in claim 56, where the lead portion of the fluted lead portion has a milled point. 61. The building structure claimed in claim 56, where the thread-forming portion has a shape selected from a group consisting of quadlobular, pentalobular, and hexalobular. 62. The building structure claimed in claim 56, where the fluted lead portion has at least HRC 50 induction hardness. 63. The building structure claimed in claim 56, where the threaded portion has less than 60° thread angle and back-tapered threads. 64. The building structure claimed in claim 56, where the threaded portion has from 45 to 50° thread angle and back-tapered threads. 65. The building structure claimed in claim 56, where at least a portion of the threaded portion of the fasteners meet a specification selected from a group consisting of ASTM A307, ASTM A325, ASTM A354, and ASTM A490 specifications. 66. The building structure claimed in claim 56, where at least a portion of the threaded portion of the fasteners meet a specification selected from a group consisting of SAE J429 Grade 2, SAE J429 Grade 5, and SAE J429 Grade 8. 67. The building structure claimed in claim 56, where the thread-forming portion is from 3 to 7 thread pitches in length. 68. A building structure comprising: a first steel building member and a second steel building member connected by a plurality of fasteners,each fastener being steel comprising a head capable of clamping the first steel building member to the second steel building member with the fastener installed,a tapered lead portion having an angle in the range from 30 to 60° of at least HRC 50 hardness adapted to start into a pilot hole in at least the second steel building member,a thread-forming portion of at least HRC 50 hardness adapted to thread the fastener into at least the second steel building member, anda threaded portion having a through hardness of in a range from about HRB 70 to HRC 40, such that the fastener is capable of providing a ratio of failure torque to thread-forming torque of at least 3.0 and a ratio of failure torque to drive torque greater than 10 when the second steel building member having a thickness of about 0.25 inch and the pilot hole having at least one diameter within nominal diameter from 80 to 98% of major diameter. 69. The building structure claimed in claim 68, where the fasteners have a drive torque no more than 50% of a thread-forming torque. 70. The building structure claimed in claim 69, where the fasteners are nutable. 71. The building structure claimed in claim 69, where the fasteners have up to five threads between the threaded portion and the thread-forming portion hardened to at least HRC 50 hardness. 72. The building structure claimed in claim 69, where the thread-forming portion has a shape selected from a group consisting of quadlobular, pentalobular, and hexalobular. 73. The building structure claimed in claim 69, where the tapered lead portion has at least HRC 50 induction hardness. 74. The building structure claimed in claim 69, where the threaded portion has less than 60° thread angle and back-tapered threads. 75. The building structure claimed in claim 69, where the threaded portion has from 45 to 50° thread angle and back-tapered threads. 76. The building structure claimed in claim 69, where at least a portion of the threaded portion of the fasteners meet a specification selected from a group consisting of ASTM A307, ASTM A325, ASTM A354, and ASTM A490 specifications. 77. The building structure claimed in claim 69, where at least a portion of the threaded portion of the fasteners meet a specification selected from a group consisting of SAE J429 Grade 2, SAE J429 Grade 5, and SAE J429 Grade 8. 78. The building structure claimed in claim 69, where the thread-forming portion is from 3 to 7 thread pitches in length. 79. A method of connecting a plurality of members in a building connection comprising: providing a first building member having a first mounting surface and a second mounting surface opposite the first mounting surface and a first member thickness there between,providing at least one fastener having a thread-forming portion and a threaded portion,positioning a second building member having a first aperture adjacent the first mounting surface,installing the fastener through the first aperture and forming threads in a fastener opening through the first member thickness connecting the second member to the first member with the thread-forming portion extending through the second mounting surface,positioning a third building member having a second aperture larger than the major diameter of the threaded portion adjacent the second mounting surface such that the second aperture is positioned over the threaded portion, andinstalling a nut over the threaded portion to connect the third member to the first member,wherein the step of providing at least one fastener comprises:providing a steel fastener comprising a head capable of clamping the second building member to the first mounting surface with the fastener installed,a threaded portion adjacent the head having a through hardness in a range from HRB 70 to HRC 40,a thread-forming portion adjacent the threaded portion of at least HRC 50 hardness adapted to form threads in the fastener opening, anda fluted lead portion adjacent the thread-forming portion of at least HRC 50 hardness with a nominal diameter in a range from 80 to 98% of major diameter of the threaded portion adapted to form the fastener opening, such that the fastener is nutable and capable of providing a ratio of failure torque to thread-forming torque of at least 3.0 when the first member thickness is about 0.25 inch.
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