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US 10,662,993 B2Granted
High-strength screw including an unhardened thread end
AssigneeKAMAX Holding GmbH & Co. KG
InventorsFrank Wagner, Harald Frischkorn
Life of this patent
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Abstract
A high-strength screw (1) includes a head (2) and a threaded portion (5) including a thread (6) and a thread end (9) facing away from the head (2) in an axial direction. The threaded portion (5) includes an unhardened portion (12) starting at the thread end (9) and extending in an axial direction. The unhardened portion (12) has a hardness being reduced compared to an axial middle portion (11) of the threaded portion (5).
Claims18
A high-strength screw, comprising:
- a head;
- and
- a shank defining an axial direction and including a threaded portion including a thread,
- the threaded portion having a first thread end facing away from the head in the axial direction,
- the threaded portion having a second thread end facing the head in the axial direction,
- the threaded portion having an axial middle portion being located in the middle between the first thread end and the second thread end, the axial middle portion having a first hardness, and
- the threaded portion including an unhardened portion, the unhardened portion starting at the first thread end and extending in the axial direction towards the head, the unhardened portion having a second hardness being reduced compared to the first hardness of the axial middle portion.
4 more elements
Dependencies are inferred from the claim text.