Formerly Emhart Teknologies & Infastech

Avibulb® XT

High strength steel breakstem fasteners with excellent bulbing tail formation ideal for thin sheet applications and use with softer materials.

The new Avdel Avibulb XT is a high strength breakstem fastener with excellent bulbing tail formation, which makes it ideal for the use in thin sheet materials. Avibulb XT structural fasteners feature a wide grip range, especially suited for applications with varying sheet thicknesses. They also have the advantage of good hole fill compensating for irregular, oversized or misaligned holes.

Key features and benefits

  • High shear and tensile strength
  • Multi-grip capability
  • High residual clamp load
  • Resists vibration and joint slippage
  • Good blind side footprint and bulb formation
  • Spreads the tail bearing load/clamp on the rear sheet
  • Suitable also in softer materials (test report available)
  • Reliable stem retention
  • Under head recess accommodates burrs around holes and spreads the load evenly on the top sheet
  • Avdel patent protected

Assembly applications

  • Automotive
  • Truck and trailer
  • Heating and ventilation
  • Domestic appliances
  • Industrial equipment
  • Renewable energies


  • Size: 6.4mm (1/4'') diameter
  • Material: Steel, zinc & clear passivated
  • Headform: Dome
Avibulb XT - Series
Material Headform Series
Steel Dome Avibulb XT BN01
 Test report Avibulb XT placed in soft materials


Details can be found in the > Breakstem Systems Catalog available in our Document Library.

Surface finish options
If you are looking for other surface finish options than shown in the above datasheets please download our

> Surface Finishes and Fastener Matrix for Breakstem Systems.

This will show you what surface finish options are possible to apply to our standard fastener types as "customer specials".

Customised Designs
We can design and manufacture breakstem fasteners with a wide variety of forms and finishes to meet your unique assembly requirements. Please refer to this page to find examples of our customised capabilities:

> Breakstem Fasteners & Sealing Plugs - Customised Designs


Installation Equipment
Genesis Range Installation Equipment can be found at the following page

> Breakstem Fasteners Installation Equipment