Strength, vibration-resistance and single-sided assembly.

Why automotive designers choose FDS!

Demanding application stresses demand an innovative yet proven fastening technology. Today’s ‘build lighter, build stronger’ body-in-white assemblies deploy composite designs where different material types need to be joined together with ease - and provide longevity of performance. That means one-sided accessibility and removability of the fastener is of paramount importance and a major advantage – especially where recyclability is a prerequisite.

Innovative thread geometry
EJOT FDS® (flow drilling screw) fastens thin sheet steel and aluminium without the need for a pilot hole, and creates an incredibly high-strength joint from single-sided access situations, for assembly into hollow profiles. It is a six-stage process; heating, penetration, through-draught formation, thread-forming, full thread engagement and finally tightening.

The geometry of the FDS® design means it accommodates the small amount of the displaced material that flows against the fastening direction which in turn means the clearance hole is free from debris. Instead, this material is absorbed into a void below the actual screw head.

Genuine cost and performance benefits
Without the need for punching or pre-drilling of a pilot hole, the EJOT FDS® joining process is considerably faster and delivers  a more efficient automated assembly. The material assembly order when fastening without a pre-hole should be ‘thin on thicker’ or ‘soft on hard’ respectively. This way higher tightening torques can be achieved and the gaps between two components minimised. The result is a screw joint that is able to transfer high pull-out as well as shearing forces, assembled quickly from one side, without the need counter support!

Contact our Team

If you’re involved with higher volume design engineering and would like a solutions-based conversation, then call or email our team.

Get in touch


Advanced M4 variant for high strength sheet metals

EJOT’s M5 FDS® fastener has become an industrywide goto solution where single-sided access and mixed material joining is combine.

New lightweight design models mean higher grade steels are now commonplace in body-in-white design and it's here that EJOT's high-strength M4 FDS screw is meeting this demands.


The FDS principle

The FDS® principle means that the relatively small amount of displaced material flows against the fastening direction which in turn means the clearance hole remains clear of debris. Instead, this material is absorbed into a void engineered into the unique geometry of the FDS® fastener head.


Advanced Assembly Options

  • One-sided joining for hollow profile assemblies, no pilot hole
  • Fully automatic robot-based assembly options
  • No material waste - no swarf
  • Hybrid joining combined with structural adhesive optional
  • Metrical compatibility for easy repairing

EJOT FDS without holes.jpg

FDS® Product Animations

Flow drill screws for high-strength metal - We've provided engineers and designers with quick reference animations to demonstrate the technology behind our fastening systems.

Watch our Product Animations:


Key Design Advantages

By specifying the sheet metal components to be joined, our online FDS® Application Check determines relevant benchmarks for the application. These include the required pressure force and recommended tightening torque. Additional feasibility pointers help you make informed design decisions.

EVO PT CAD & CALC V2 - 640 x 377.png

CAD, Calc and more

CAD data is available in various formats, plus technical drawings of key products. You can also design individual joints with the aid of prognosis programs and check their feasibility with our Application Checker.

Register or Login