W-clips were specially developed for fastening HLU panels (sealed/closed gratings) to the support profile. Both the sealed panel and the profile must be drilled. As standard, the W-clip consists of the following parts:

  • 1x bolt M8 x 70/90 with countersunk head;
  • 1x flat plate;
  • 1x arm;
  • 1x M8 square nut.


The W-clip is available in a variety of qualities depending on the application and environment.

  • Stainless steel 316-A4: Vinylester gratings (type VE-FR, VE-XFR) for chemicals;
  • Stainless steel 304-A2: Isophthalic grating (type ISO-FR and all other types) for normal corrosion-resistant outdoors and offshore-marine environments;
  • Galvanised (HD): orthophthalic gratings (type ECO-NFR, ECO-FR) for all low-corrosion environments.


Fiberstruct’s fastening materials satisfy all applicable standards. You can find these in the appendices at the bottom of this page.

Height and grating mesh width

The W-clip is suitable for all types of gratings with square meshes and the heights listed below:

  • 25 mm (1 inch);
  • 30 mm (1.25 inches);
  • 38 mm (1.5 inches);
  • 50 mm (2 inches).
A new office Our new office at Industrieweg 32 in Terneuzen is almost finished and our GRP gratings cannot be missed of course! We will move to the new office by the end of this year.
Project reservoir Africa Fiberstruct has recently succeeded in providing a total GRP solution for an important reservoir in Africa. We supplied GRP gratings and ladders with anti-slip and GRP railings Another great collaboration abroad!