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Avibulb® XT

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

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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

>>> Avibulb® XT Flyer (UK version)

>>> Avibulb® XT Flyer (US version)
>>> Test report Avibulb® XT placed in soft materials

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


>>> POP Avdel Breakstem Systems Catalog (7 MB)


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

The picture below shows the Avdel Genesis® nG4 handtool which can be used to place Avibulb® XT fastener. 

Tool Selection
Follow this link to find the tools suitable for your breakstem fastener:
>>> Placing Capablity Genesis® nG Tools

Nose Equipment Selection

Follow this link to find the correct nose equipment for your breakstem fastener:

>>> Nose Equipment Genesis® nG Tools

For further information on specific nose equipment, please contact your local Avdel® representative or use our tool manuals:
>>> Tool Manuals

Alternative Products

Structural breakstem fasteners with exceptional shear and tensile strength and a large blind side bearing area against the rear sheet.


Q Rivet

Structural breakstem fasteners with an internal interference lock and a weatherproof feature.

Complementary Information

Genesis® Range
New high performance, lightweight hydro-pneumatic handtools for breakstem rivets.

Avibulb® XT Part Numbers

0BN01-00816 0BN01-00820