Formerly Emhart Teknologies & Infastech

Octolok® Staking Fasteners

Octolok studs and nuts are Grade strength fasteners designed to provide external or internal threads in the most demanding applications including light gauge sheet materials.

Octolok fasteners improve quality & reliability, simplify production processes and reduce the cost of assembly. Octolok fasteners can replace weld-studs and eliminate painting/plating costs.

Octolok fasteners are placed into drilled or pre-punched holes of a specific diameter recommended for each size fastener. A press applied force drives the 8 lobe forming feature into the application material forcing the material to flow into the fastener retention groove delivering excellent torque-to-turn performance whilst the retaining ring provides superior push-out values. Octolok fasteners can be placed manually one at a time or the assembly process can be automated.

Features and Benefits

  • Octolok 8 lobe symmetrical configuration
    = Superior torque-to-turn & vibration resistance
    = Increased push-out value performance
    = Utilize existing 6 lobe clinch stud press/tooling
  • Installation can be automated
    = High speed installation reduces assembly cost
  • Heat treated to SAE standard/ISO class
    = High strength can allow reduction in fastener diameter for lower cost assembly
  • Available in imperial and metric sizes
    = Suitable for all markets - manufactured to customer requirements
  • Available in assorted coatings/finishes
    = Ready to use, no re-plating or painting required

Cross section of material flow after completed installation


  • Thread Size
  • Studs: M4 - M12 / #8 - 1/2