orange square K' in K' - Plastic in plastic systems

Screw-in clip UNITEC® plastic in plastic

Technology
The screw-in clip is pressed into an existing square opening (8 x 8 mm) of component A. (Picture 1)
Its two captive features are ensured by engagement points and the helix flank support.
Then component B is laid in place and the thread-forming plastic in plastic screw is turned into the screw-in clip through the existing hole of the component. (Picture 2)
During this process the screw-in mandrel is pulled under component A in axial direction such that the shank area folds and the helix flank deforms and makes contact by a slight clockwise rotation.
(Picture 3) This creates a watertight screw connection.
  • watertight
  • can be fitted from one side
  • weight reduction
  • recyclable
  • application 0.8 – 2.5 mm plate thickness for component A (metal, plastic)
  • no corrosion problems



Picture 1
Picture 2
Picture 3
Applications
Where a cut thread is not possible due to thin wall thicknesses, yet the connection must allow loosening, e.g. in the automotive industry for wheel arch panel.
Table of parameters
Material Support
Wall thickness support
mm
Screw-in torque
ME [Nm]
Tightening torque
MA [Nm]
Loosening torque
ML [Nm]
Axial pull-out force
F [N]
Steel
0,8 - 2,5
0,4
1,3 - 1,5
ca. 1
400*
Plastic**
0,8 - 2,5
0,4
1,3 - 1,5
ca. 1
400*
Screw-in rpm up to 700

*
**		From 400 N deformation of the screw connection starts, up to destruction at approx. 900 N.
With a 0.8 mm wall thickness, glass fibre filled construction plastic is required for the screw-in clip. The strength of the support material can decrease as the wall thickness increases.
Material
Clip:
Plastic in plastic screw: 		PA high impact resistant
PPA GF
Screw-in blind rivet UNITEC® plastic in plastic
Technology
The screw-fitted blind rivet is inserted in the hole of component A. (Picture 1) Laterally fitted ridges provide the captive effect. Torsion resistance is achieved by the flange counter-bearing.

Following this, component B is laid on and the plastic in plastic screw fitted in the blind rivet through the component. (Picture 2) For this fastening system varying gap dimensions are no problem because when fitting, the screw-fitted blind rivet pulls itself beneath component B in axial direction in a tolerance compensating manner.

At the same time a bead is formed which snugs at the rear beneath component A to be fastened. (Picture 3)

  • tolerance compensating
  • can be fitted from one side
  • weight reduction
  • recyclable
  • no corrosion problems



Picture 1
Picture 2
Picture 3
Applications
Where a cut thread is not possible due to thin wall thicknesses and/or where production-referenced component tolerances have to be compensated, e.g. in the automotive industry, in machine and machine line manufacture...
Table of parameters
Material Support
Wall thickness Support
mm
Screw-in torque
ME [Nm]
Tightening torque
MA [Nm]
Loosening torque
ML [Nm]
Axial pull-out force
F [N]
Steel
0,8 - 3
0,3
1,2 - 1,6
ca. 1
ca. 400
Screw-in rpm 350

Test and specifically adapt the above values for each individual application.
Material
Blind rivet:
Plastic in plastic screw:		PA66-6
PPA GE


letzte Änderung dieser Seite am 29.01.2006