Self-Tapping, Self-Drilling and Thread-Forming / Trilobular Screws – Stainless Steel
Self-Drilling Screws
Self-drilling screws combine a drill tip and self-tapping thread, allowing drilling and fastening in a single operation. Perfect for sheet metal and steel structures, they ensure precision and speed, reducing installation time.
Compliant with DIN 7504, they are available in various head types depending on the application:
- DIN 7504K / UNI 8117: Hex head, used for metal sheets and structures.
- DIN 7504P / UNI 8119: Countersunk head, ideal for flush finishes on metal.
- DIN 7504N / UNI 8118: Pan head, for neat aesthetics and broad contact area.
Finishes:
- White zinc-plated
| UNI | DIN | ISO | |
|---|---|---|---|
| C15 | t.c dummy washer | / | / |
| C15 | 8117 | 7504-K | 15480 |
| C15 | 8118 | 7504-N | 15481 |
| C15 | 8119 | 7504-P | 15482 |
Self-Tapping Screws
Self-tapping screws create their own thread as they are driven into material. Their versatility makes them essential across construction, automotive, and industrial sectors, suitable for metal, plastic, and wood.
Main Standards:
- DIN 7981 / UNI 6954: Pan head screws with Phillips drive – aesthetic and wide contact surface.
- DIN 7982 / UNI 6955: Countersunk head screws – flush installation on wood or plastic.
Grades:
- A2 | AISI 304
- A4 | AISI 316
| DIN | UNI | ISO | |
|---|---|---|---|
| – | 6954 | 7981 | 7049 |
| – | 6955 | 7982 | 7050 |
Thread-Forming / Self-Threading or Trilobular Screws
Trilobular screws are designed to form internal threads during installation, thanks to their three-lobe section. This geometry allows controlled material deformation, reduces torque, and increases vibration resistance. They are widely used in electronics, automotive, and precision mechanics, especially with plastic and soft metals.
Main Standards:
- DIN 7500D / UNI 8110: Hex head trilobular screws for thread formation in metal – reliable fastening and high mechanical strength.
- Pan head trilobular screws with cross recess according to DIN 7500C / UNI 8112 – for harder metals, reduces torque and improves assembly.
- Countersunk flat head self-threading screws with cross recess DIN 7500M / UNI 8113 – developed for thin sheet metal, ensures precise fit and minimizes damage.
- DIN 7500D / UNI 8110 (hex head) – firm grip and easy installation in demanding conditions; widely used in mechanical, automotive, and industrial plant sectors.