CELOspArk® screw

For an optimal direct assembly of ductile plastics.

When to choose CELOspArk® screw?

How does it work?

When compared CELOspArk® to self-tapping screws (ISO 1478), the larger thread pitch and thread height of CELOspArk® screw results in bigger shearing zone, providing a more resistant nut member and, consequently, an increase in pull-out and stripping resistance.

If we carry out a resolution of resultant forces, 30º thread angle provides a 50% reduction of radial tension (Fr) when compared to self-tapping screws (60º).

The technical benefits of CELOspArk® screws provide a more resistant assembly, greater safety during threading and lower costs of assembly.


  • 30º thread design generates less radial tension on plastic reducing the problem of boss bursting.
  • Allows for bosses with smaller diameter, reducing the cost of the assembly.
  • Lower thread forming torque for a more ergonomic assembly. 
  • More resistant to pull-out and vibrational loosening.
  • Higher stripping resistance.
  • Quick alignment of the screw before screwing in, thus reducing assembly time.
  • Screws can be reused with a reduced risk of stripping.

Need to get in touch? Contact us to discuss your application.

Contact us

Downloads & Services

3D CAD Files

Screw design specifications

We produce customized CELOspArk® screws to fit your exact requirements. To improve their functionality, CELOspArk® screws can be produced under different head designs, recess, dimensions and coating configuration. 

Additionally, we offer a wide range of CELOspArk® screws in stock for immediate delivery.

For further information on the options available, please contact our application engineers.

Our team of experts is ready to support you.

Contact us

Boss Design Guidelines

In order to ensure a safe installation and stable clamping force, it's relevant to pay attention to the boss design.

The recommended dimensions for core hole diameter and length of engagement are available at Design Guidelines.