US Patent:
20080166200, Jul 10, 2008
Inventors:
David S. Hippensteele - Fort Wayne IN, US
Nick C. Knappenberger - Fort Wayne IN, US
International Classification:
F16B 31/00
Abstract:
A device integrally formed with a threaded nut or bolt for establishing that a desired minimum preload condition has been attained. The device includes an annular portion including a disk shaped bottoming surface and a top area. A frusto-conical portion circumscribes the annular portion and includes a frusto-conical bottoming surface with an inner smaller diameter abutting the disk shaped bottoming surface and an outer larger diameter spaced longitudinally from the disk shaped bottoming surface. The frusto-conical bottoming surface forms an angle with a plane transverse to the longitudinal of between ten (10) and thirty (30) degrees. The device is preferably made of steel having carbon content of less than 0.3%.