US 12,110,919 B2
Bimetallic stainless screw
Roland Schneider, Schlins (AT)
Assigned to Hilti Aktiengesellschaft, Schaan (LI)
Appl. No. 17/800,479
Filed by Hilti Aktiengesellschaft, Schaan (LI)
PCT Filed Feb. 9, 2021, PCT No. PCT/EP2021/053052
§ 371(c)(1), (2) Date Aug. 17, 2022,
PCT Pub. No. WO2021/165094, PCT Pub. Date Aug. 26, 2021.
Claims priority of application No. 20158000 (EP), filed on Feb. 18, 2020.
Prior Publication US 2023/0077013 A1, Mar. 9, 2023
Int. Cl. F16B 25/00 (2006.01)
CPC F16B 25/0026 (2013.01) [F16B 25/0073 (2013.01); F16B 25/0094 (2013.01); F16B 25/00 (2013.01)] 3 Claims
OG exemplary drawing
 
1. 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.