Patent ID: 8876170

Claim:
A drive nut for a conduit fitting, comprising: a female threaded drive nut body comprising an interior socket centered on a longitudinal axis and sized to receive a front ferrule and a back ferrule, said interior socket, when viewed in longitudinal cross-section, comprising: a drive surface that tapers radially outward and towards an inboard end of said drive nut body, said drive surface being tapered at a drive surface angle between approximately 2° to approximately 25° relative to said longitudinal axis; a first longitudinal surface that extends towards said inboard end of said drive nut body, said first longitudinal surface being tapered at an angle α between 0° to approximately 30° relative to said longitudinal axis, and a second longitudinal surface axially between said drive surface and said first longitudinal surface, said second longitudinal surface being tapered at an angle β between approximately 20° to approximately 60° relative to said longitudinal axis, said second longitudinal surface being contiguous with said drive surface and said first longitudinal surface, said angle α being different from said angle β and both said angle α and said angle β being different from said drive surface angle, wherein when the drive nut is assembled with the front ferrule and the back ferrule said first longitudinal surface will align axially with a rearward portion of the front ferrule and said second longitudinal surface will align axially with a rearward portion of the back ferrule, and said drive surface will contact a driven surface of the back ferrule.