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US 12,110,919 B2Granted
Bimetallic stainless screw
AssigneeHilti Aktiengesellschaft
InventorRoland Schneider
Life of this patent
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Abstract
A screw includes a shank having a tip, a rear end which is disposed opposite the tip, and a longitudinal axis which extends through the tip and through the rear end. The shank consists of a first steel material. A screw thread helix is disposed on the shank and protrudes from the shank. The screw thread helix consists of a second steel material that is different from the first steel material. Both the first steel material and the second steel material are stainless steels.
Claims3
A concrete screw for an outdoor application, comprising:
- a shank having a tip, a rear end which is disposed opposite the tip, and a longitudinal axis which extends through the tip and through the rear end, wherein the shank consists of a first steel material;
- and
- a screw thread helix which is disposed on the shank and which protrudes from the shank, wherein the screw thread helix consists of a second steel material that is different from the first steel material;
- wherein both the first steel material and the second steel material are stainless steels of respective different grades;
- wherein the first steel material has a Vickers hardness below 440 HV10;
- wherein the second steel material has a Vickers hardness between 550 HV10 and 800 HV10.
3 more elements
Dependencies are inferred from the claim text.