Marutex thread forming type C
Thread Forming Type C Screws for Light Section Steel
Choose the right Marutex thread forming type C screw
Our Marutex thread forming type C range is built for fastening light section steel where you need stainless performance and a dependable formed thread in thinner steel sections. This page stays focused on the FC family only: the Marutex C-thread screws used for joining light section steel and profile applications where the catalogue calls for this specific screw type.
Below, you can compare the two FC options in the range, see where the family is intended for pre-drilled installation, and understand where the catalogue gives the drill-hole guidance and technical data that matter most. If you are choosing for an exposed project, our guides on corrosion classes, stainless steel and drilling capacity are the most relevant supporting reads.
In our Marutex thread forming type C range
FC49M 4.8 x 13
Choose our FC49M when you need the smaller 4.8 mm option in the Marutex C-thread family for light section steel. It is the tighter-format choice on this page and belongs in the FC family’s stated use for thinner steel combinations, including installation in up to 2 x 0.7 mm steel without pre-drilling.
See sizes and drill guidance for FC49M on page 12 in the catalogue
FC61M 6.3 x 19
Use our FC61M when you want the larger 6.3 mm alternative in the same thread forming type C family. This is the heavier option on the page and belongs where you need the FC family’s larger diameter for light section steel, including the stated use in up to 2 x 0.7 mm steel without pre-drilling.
See sizes and drill guidance for FC61M on page 12 in the catalogue
Detailed thread forming type C data in our catalogue
Open the catalogue below at the FC section if you want the exact Marutex part numbers first. That page keeps the family tight and lets you compare the available thread forming type C screws without drifting into unrelated screw types.
If drill-hole diameter, substrate thickness or project documentation matters, the technical pages are also worth checking. That is where our relevant Marutex type FC design values and the main installation notes for this family sit.
Need help choosing the right thread forming type C screw?
We help contractors, installers and technical buyers choose the right Marutex thread forming type C screw for the actual steel build-up, installation method and project environment. If you want a quick recommendation before ordering, we can help you narrow the choice fast and keep the page scope focused on the right FC option.
How do I choose between FC49M and FC61M?
Choose between them first by screw diameter and the build-up you are working with. FC49M is the smaller 4.8 mm option, while FC61M is the larger 6.3 mm option. The right choice depends on the steel combination, the hole preparation and the connection requirement shown for the FC family in the catalogue.
Do I need to pre-drill for thread forming type C screws?
In most cases, yes - this family is primarily presented for pre-drilled light section steel. At the same time, the FC family is also stated for use in up to 2 x 0.7 mm steel without pre-drilling. The practical decision is therefore based on your actual steel thickness and whether your connection is within that thinner no-pre-drill use.
Where are Marutex thread forming type C screws most relevant?
They are most relevant where you are joining light section steel and profiles and want this specific C-thread fastening method rather than a self-drilling alternative. The Swedish Marutex source also points this family toward uses such as roof safety and solar panel mounting, where the correct steel-fit and installation method matter.
Why does drill-hole diameter matter with thread forming screws?
It matters because the screw forms its thread in the steel during installation. If the hole is wrong, installation can become harder, slower or less dependable. That is why the catalogue gives drill-hole guidance by screw diameter and substrate thickness, and that guidance should be matched before ordering or installing.
Are thread forming type C screws the same as self-drilling screws?
No - they are not the same product logic. This page is for thread forming type C, which is selected when the connection is built around a formed thread in the steel and the hole-preparation rules shown for the FC family. A self-drilling screw belongs to another product-family choice and should not be substituted automatically.
Do I need to think about corrosion class when choosing this family?
Yes, especially on exposed projects. Marutex is chosen where stainless performance matters, so corrosion requirements should be checked early rather than after the fastening type has already been fixed. That avoids rework and helps make sure the selected FC screw fits both the connection and the environment.