Abstract

The invention relates to a coating for screws, in particular aluminium screws, on the basis of a water-based polytetrafluoroethylene emulsion, to which surface-modified nanoparticles are admixed, wherein the surface-modified nanoparticles are formed from silicon dioxide and are covered on their surface with epoxy groups which crosslink at a temperature of below 150°C. The invention also relates to a screw or a nut which is is provided with such a coating. The invention additionally relates to a method for coating a screw with such a coating.

IPC Classes  ?

• C09D 123/30 - Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bondCoating compositions based on derivatives of such polymers modified by chemical after-treatment by oxidation
• C09D 127/18 - Homopolymers or copolymers of tetrafluoroethene
• F16B 33/06 - Surface treatment of parts furnished with screw-thread, e.g. for preventing seizure
• C08K 9/06 - Ingredients treated with organic substances with silicon-containing compounds
• C08L 27/18 - Homopolymers or copolymers of tetrafluoroethene
• C08L 91/08 - Mineral waxes

Abstract

The invention relates to a screw and washer assembly, comprising a screw, which is produced from a steel alloy 38B2 according to DIN EN 10263, and a washer which is produced from a steel alloy C22 according to DIN EN 10083, wherein the washer material has a carbon content of 0.18 % to 0.23 %, a manganese content of 0.5 % to 0.7 % and a chromium content of 0.1 % to 0.4 %. The invention further relates to a method for producing such a screw and washer assembly.

IPC Classes  ?

• C22C 38/04 - Ferrous alloys, e.g. steel alloys containing manganese
• C21D 9/00 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor
• C22C 38/20 - Ferrous alloys, e.g. steel alloys containing chromium with copper
• F16B 25/00 - Screws that form threads in the body into which they are screwed, e.g. wood screws, self-tapping screws
• F16B 35/00 - Screw-boltsStay boltsScrew-threaded studsScrewsSet screws
• F16B 43/00 - Washers or equivalent devicesOther devices for supporting bolt-heads or nuts
• C22C 38/18 - Ferrous alloys, e.g. steel alloys containing chromium

Abstract

The invention relates to a fastening element, comprising a cylindrical threaded portion having an external thread which transitions into a transition thread of an adjoining centering portion, said transition thread having at least one turn. The at least one transition thread turn is designed in such a way that its flanks transition into a curved surface, the centering portion having a threading portion comprising a frusto-conical portion at the end.

IPC Classes  ?

• F16B 35/04 - Screw-boltsStay boltsScrew-threaded studsScrewsSet screws with specially-shaped head or shaft in order to fix the bolt on or in an object

Abstract

The invention relates to a self-tapping screw (1) consisting of a low-strength non-ferrous material, having a screw body (3) which is provided, at least in regions, with a coating (5), wherein the coating (5) is formed from an elastomer or polymer material enriched with fillers.

IPC Classes  ?

• F16B 35/04 - Screw-boltsStay boltsScrew-threaded studsScrewsSet screws with specially-shaped head or shaft in order to fix the bolt on or in an object
• F16B 25/00 - Screws that form threads in the body into which they are screwed, e.g. wood screws, self-tapping screws

Abstract

The invention relates to a self-tapping screw (1) consisting of a low-strength non-ferrous material, having a screw body (3) which is provided, at least in regions, with a coating (5), wherein the coating (5) is formed from an elastomer or polymer material enriched with fillers.

IPC Classes  ?

• F16B 25/00 - Screws that form threads in the body into which they are screwed, e.g. wood screws, self-tapping screws

Goods & Services

Screws, screw nuts, bolts, nails, rivets; all of metal, in particular aluminium, steel and stainless steel.