Bollhoff Amtec Hitsert 2

The Bollhoff AMTEC® solution allows you to embed components into plastic! AMTEC® stands for – After Molding TECHnology – and refers to the installation of threaded nut inserts into plastic components after-molding. Bollhoff AMTEC® thread inserts enable you to achieve superior quality bonding resulting from high-strength metals in combination with plastics.

Bollhoff AMTEC® Product Types

Bollhoff AMTEC® Advantages

  • Shorter Injection Cycles
    • No wasted time! The component injection molding process takes place automatically without the need to insert metal parts. Safe production can also be guaranteed.
  • Low-stress Anchoring
    • High pull-out and torsion values! Because the plastic is heated during installation, as it cools, it creates a tight fit with low stress.
  • Reduction in Manufacturing Costs
    • Saves costs while maintaining top quality! AMTEC® threaded nut inserts have been specifically designed for after-molding installation. The result is a wear-free, high-strength thread in your high-quality plastic components.

Proven Strength of Threaded Nuts

AMTEC® provides 5 ways to achieve high-strength threads in plastics: Heat Element Welding (HEW), Electromagnetic Resistance Welding (ERW), and Ultrasonic Welding (USW)!

Heat Element Welding (HEW)

Heat Element Welding (HEW) is a tried and tested joining technique to embed metal thread inserts into thermoplastic moldings. During the single-phase process, contact heat is transferred to the joining zone of the plastic via the metal insert. Joining takes place on fusion of the plastic at the contact surface. During this process, the plasticized mass is forced into specific recessed areas and undercuts to produce a form-closed joint.

Suitable for:

Electromagnetic Resistance Welding (ERW)

Electromagnetic Resistance Welding (ERW) is a technique for the joining of metal and thermoplastics. An electromagnetic AC field heats the threaded insert without contact and the contact surface of the plastic component is plasticized. During the simultaneous joining process, the melted material is forced into recessed areas and undercuts. Metal elements of any size are heated up extremely quickly (Approx. 2 – 6 s). After switching off the power supply, accelerated cooling of the melt takes place, allowing an installation accuracy of up to 0.05 mm.

Suitable for:

Ultrasonic Welding (USW)

UltraSonic Welding (USW) is a process that was originally developed for joining thermoplastic parts. Within a very short time, the plastic material is plasticized by both boundary-layer friction and vibration absorption of the parts to be joined. This is followed by the joining process. The necessary energy is generated as alternating voltage in the ultrasonic generator, converted into mechanical vibration (20 – 40 kHz), and then introduced with a sonotrode. With the embedding of thread inserts (metallic M 2 – M 6) in the thermoplastic material, the melted material is forced into recessed areas and undercuts.

Suitable for:


Expansion Anchoring

When the thread insert is inserted into the mounting hole, the diamond knurling is expanded by the spreader plate, which is pushed down. The knurling then anchors itself in the wall of the hole.

Suitable for:

Self-Tapping Insertion

The thread bush is screwed in with a rotating spindle.

Suitable for:

Bollhoff AMTEC® Catalog Information

Click to Open Bollhoff AMTEC® Catalog Information

Rivet Nut USA has many high-quality joining products that will help you attain a strong bond between metals and plastic! Contact us for a FREE quote or more information today!