# US 12,110,919 B2 · Bimetallic stainless screw

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- Number: US 12,110,919 B2
- Document ID: US12110919B2
- Status: Granted
- Kind: B2
- Application number: 17/800,479
- Filed: 2021-02-09
- Published: 2023-03-09
- Granted: 2024-10-08
- Earliest claimed: 2020-02-18
- Assignees: Hilti Aktiengesellschaft
- Applicants: Hilti Aktiengesellschaft
- Inventors: Roland Schneider
- Web page: https://patentgrep.com/patent/US12110919B2

## CPC

- F16B 25/0026: {the material being a hard non-organic material, e.g. stone, concrete or drywall (F16B25/0031 takes precedence)}
- F16B 25/0073: {characterised by its pitch, e.g. a varying pitch}
- F16B 25/0094: {the screw being assembled or manufactured from several components, e.g. a tip out of a first material welded to shaft of a second material}
- F16B 25/00: Screws that cut thread in the body into which they are screwed, e.g. wood screws {(F16B35/065 takes precedence; joining sheets or plates using screws with two separate threads F16B5/0275, using screws with adjustment sleeves F16B5/0283)}
- F16B: DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING (couplings for transmitting rotation F16D)

## 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.

## Claims

### Claim 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.

### Claim 2 (depends on 1)

The screw according to claim 1, wherein the screw thread helix spans at least 40% of a length of the shank.

### Claim 3 (depends on 1)

The screw according to claim 1, wherein a ratio of an outer thread diameter of the screw thread helix to a pitch of the screw thread helix is between 1 and 2 at least in regions of the screw thread helix.