Self-Tapping, Self-Drilling, and Thread-Forming / Trilobular Screws
Self-Drilling Screws
Self-drilling screws combine a drill point with a self-tapping thread, allowing them to drill and fasten in a single operation.
Ideal for sheet metal and steel structures, they ensure precision and speed, reducing installation times.
In compliance with DIN 7504, self-drilling screws are available in various head types to suit different applications:
- DIN 7504K / UNI 8117: Self-drilling screw with hex head, used for fastening sheet metal and steel structures.
- DIN 7504P / UNI 8119: Self-drilling screw with countersunk head, ideal for flush surface fastening on metal materials.
- DIN 7504N / UNI 8118: Self-drilling screw with pan head, designed for a neat finish and large 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 are designed to cut their own threads into the material during installation. Their versatility makes them essential across many industries, including construction, automotive, and manufacturing, with applications on metal, plastic, and wood.
Main standards:
- DIN 7981 / UNI 6954: Pan head self-tapping screws with Phillips cross recess, ideal for aesthetic fixings and wider contact surface.
- DIN 7982 / UNI 6955: Countersunk head self-tapping screws, perfect for flush installation on wood or plastic.
Finishes:
- White zinc-plated
- Nickel-plated
| UNI | DIN | ISO | |
|---|---|---|---|
| C15 | t.c. dummy washer | / | / |
| C15 | 6950 | 6928 | / |
| C15 | 6954 | 7981 | 7049 |
| C15 | 6955 | 7982 | 7050 |
| C15 | 1/2 round | / | / |
| C15 | t.c.e.i. | / | / |
Thread-Forming / Self-Tapping or Trilobular Screws
Trilobular screws are ideal for forming internal threads directly during insertion, thanks to their three-lobe geometry. This shape allows for controlled deformation of the pilot hole material, reducing required torque and increasing resistance to vibration. They are widely used in applications involving plastic materials and soft metals, especially in electronics, automotive, and precision mechanics.
Main standards:
- DIN 7500D / UNI 8110: Trilobular screws with hex head, designed to form threads directly in metal, offering secure fastening and optimal mechanical strength.
- Pan head trilobular screws with Phillips drive compliant with DIN 7500C / UNI 8112 are suited for harder metals, providing solid and reliable fastening. Their geometry reduces torque and optimizes the screwing process, making them ideal for industrial and mechanical use.
- Countersunk flat head trilobular screws with Phillips drive DIN 7500M / UNI 8113 are specifically developed for fastening in thin sheet metal. Their design ensures effective penetration and precise adaptation to the material, minimizing risk of damage or deformation. Common in light steelwork and industrial assembly, where a balance of strength and delicacy is essential.
- DIN 7500D / UNI 8110 trilobular screws with hex head ensure reliable fastening in metallic materials. Their trilobular geometry allows precise thread formation during screwing, reducing effort and improving holding power. Ideal for applications requiring strength and safety, widely used in mechanics, automotive, and industrial plant construction. The hex head ensures a firm grip and easy installation even in demanding working conditions.