Nut and stud assembly

A nut and stud assembly for securing workpieces together with at least one of the workpieces having a threaded bore comprising:

• a stud member having a first threaded portion at one end,
• a nut adapted to be threaded onto said first threaded portion,
• said stud member having a second threaded portion at an opposite end from said one end and adapted to be threaded into the threaded workpiece bore,
• first stop means between said nut and said first threaded portion and permitting initial movement of said nut on said first threaded portion up to a first preselected position and adapted to engage said nut to resist further threaded movement of said nut until a preselected first magnitude of torque between said nut and said stud has been attained,
• said stud with said nut at said first preselected position functioning similarly as a headed bolt and adapted to have said second threaded portion threaded into said workpiece bore through the application of torque at a second magnitude of torque on said nut,
• said second magnitude of torque being less than said first magnitude of torque,
• second stop means being engageable for resisting movement of said second threaded portion in said workpiece bore when said second threaded portion has attained a preselected second position in said workpiece bore with the torque of such resisting movement being at a magnitude of torque greater than said first magnitude,
• said first stop means responsive to a magnitude of torque on said nut greater than said first magnitude and less than said second magnitude for permitting further movement of said nut onto said first threaded portion beyond said first preselected position after said second stop means has been engaged with said nut being free running on that part of said first threaded portion beyond said first preselected position whereby the workpieces can be clamped together in the manner of a nut and separate stud combination,
• said first stop means comprising first material located in said first threaded portion for interfering with the threads of said nut.

A nut and stud assembly for securing workpieces together with at least one of the workpieces having a threaded bore comprising:

• a stud member having a first threaded portion at one end,
• a nut adapted to be threaded onto said first threaded portion,
• said stud member having a second threaded portion at an opposite end from said one end and adapted to be threaded into the threaded workpiece bore,
• first stop means located at a preselected first position in said first threaded portion permitting initial movement of said nut on said first threaded portion up to a first preselected position and adapted to engage the threads of said nut to resist further threaded movement of said nut until a preselected first magnitude of torque between said nut and said stud has been attained,
• said stud with said nut at said first preselected position functioning similarly as a bolt and adapted to have said second threaded portion threaded into said workpiece bore through the application of torque at a second magnitude of torque on said nut,
• said second magnitude of torque being less than said first magnitude of torque,
• second stop means being engageable for resisting movement of said second threaded portion in said workpiece bore when said second threaded portion has attained a preselected second position in said workpiece bore with the torque of such resisting movement being at a magnitude of torque greater than said first magnitude,
• said first stop means responsive to a magnitude of torque on said nut greater than said first magnitude and less than said second magnitude for permitting further movement of said nut onto said first threaded portion beyond said first preselected position after said second stop means has been engaged with said nut being free running on that part of said first threaded portion beyond said first preselected position whereby the workpieces can be clamped together in the manner of a nut and separate stud combination,
• said nut comprising a plurality of conical spring disc washers and a cage,
• said cage receiving and holding said disc washers in a stacked, aligned relationship to define a central opening threaded for threaded engagement on said first threaded portion, said cage including a ring portion and a plurality of axially extending fingers cooperating with said ring portion to hold said disc washers in said stacked, aligned relationship,
• said first stop means comprising first material located in said first threaded portion for interfering with the threads of said central opening,
• said disc washers having a preselected hardness greater than the hardness of said first material such that said nut can be threaded through said material in response to the application of torque on said nut substantially greater than said first magnitude and less than said second magnitude without damage to the threads of said central opening.