Choose a language


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

Oops, an error occurred! Code: 20211018051918a7fa19fe


The Avdel Hemlok® fastener is a structural breakstem fastener with exceptional shear and tensile strength. The Hemlok rivet features an interference lock ensuring the strongest  vibration resistant joints whilst the  large blind side bearing area spreads the load and prevents creep.

Key features and benefits

  • Exceptional shear and tensile strength
  • Large blind side bearing area against the rear sheet
  • Interference lock formed by a splined stem
  • Spreads the tail bearing/clamp load on the rear sheet
  • Ideal for thin sheet materials
  • Provides strong, vibration resistant joints
  • No damage, electrical problems or rattling due to loose stems

Assembly materials

Hemlok® can be used to fasten:

  • Metal to metal
  • Metal to plastic
  • Thin sheet to thick metal

Assembly applications

  • Automotive
  • Warehouse racking
  • Ladders


  • Sizes: 6.4mm (¼")
  • Materials: Aluminium alloy, steel
  • Headform: Protruding
Hemlok® - Series
Material Headform Series
Steel Protruding Hemlok® 2221
Aluminium Alloy Protruding Hemlok® 2241


>>> 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 Genesis® nG handtool which can be used to place Hemlok® fasteners.


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

Multi-grip structural breakstem fasteners providing a fully sealed joint and visible lock.

Complementary Information

Genesis® nG4
New high performance, lightweight hydro-pneumatic handtools for breakstem rivets.

Hemlok® Part Numbers

02221-00812 02221-00813 02221-00814 02221-00815 02221-00817 02221-00818 02221-00819 02221-00821 02241-00812 02241-00813 02241-00814 02241-00815 02241-00817 02241-00819 02241-00821