How Fastening Technology Can Drive Weight Reduction in Rail Assembly

The global rail sector faces a defining challenge: optimising energy efficiency and minimising infrastructure wear while enhancing passenger capacity. Achieving these goals requires aggressive weight reduction across rolling stock and trackside applications.

Transitioning to lightweight materials such as aluminium extrusions, advanced composites, and thin-walled high-strength steels is only half the battle. The real engineering bottleneck often lies in how these materials are joined. Traditional fastening methods like nuts, bolts, and heavy rivets introduce unnecessary weight penalties and assembly bottlenecks.

EJOT’s advanced thread-forming fasteners offer a direct, highly engineered alternative that slashes component weight, simplifies assembly, and satisfies the rigorous structural demands of modern rail applications.

The Core Philosophy: Eliminating "Dead Weight"

In a traditional mechanical joint, a significant portion of the weight comes from secondary components: nuts, washers, locking rings, and inserts. When multiplied across thousands of fastening points in a single rail carriage from interior trim and seating arrangements to HVAC housings and structural body panels, this "dead weight" quickly adds up.

EJOT's thread-forming screws, such as the ALTRACS® XT for light alloys and the EVO PT® for plastics and composites, eliminate these extra components entirely.

By forming their own high-strength, reusable machine threads directly into pre-drilled or cast pilot holes, these fasteners form a secure joint using only the screw itself. This component consolidation can reduce fastening assembly weight by up to 40% per joint whilst also speeding up production times.

Key Features & Rail Sector Alignment

Every gram saved in rail engineering must be balanced against safety, longevity, and structural integrity. EJOT’s fastening portfolio is designed around the exact operating environments defined by rail standards.

Superior Vibration Resistance

Rail vehicles operate under constant dynamic loading and high-frequency vibrations that easily loosen standard nuts and bolts.

• The thread geometry of EJOT fasteners creates a continuous, interference-fit contact zone with the parent material.
• This deep thread engagement yields exceptional resistance to vibrational loosening without requiring chemical thread-lockers or heavy locking washers, ensuring long-term joint integrity over millions of duty cycles.

Optimised for Multi-Material Joining

Modern carriage interiors and body components increasingly utilise a hybrid mix of materials, pairing lightweight aluminium profiles with fibre-reinforced polymers or structural composites.

• Fasteners like the EVO PT® feature a specialised thread pitch and flank angle that minimises radial stress in plastics, preventing material cracking while maximising clamp load.
• Engineers can safely implement thinner, lighter plastic composites for interior panelling, ducting, and electronic enclosures without sacrificing structural reliability.

Single-Sided Access & Rapid Installation

Traditional through-bolting requires technicians to have physical access to both sides of a joint to hold the nut and torque the bolt.

• Thread-forming fasteners are installed entirely from one side (blind fastening).
• This simplifies the design of closed-profile aluminium extrusions and structural pillars. Carriages can be made lighter and stiffer because engineers do not need to design access pockets or clearance holes into the structure

Next-Generation Foams & Honeycombs

EJOT’s EPPsys (Expanded Polypropylene System) range pushes the boundaries of lightweighting. Innovative plastic fastening elements designed specifically for secure direct assembly into foamed materials and lightweight honeycomb structures. In the rail sector, this versatile range finds crucial applications in cutting-edge interior components, partition walls, and next-generation lightweight seating designs where weight reduction is critical for energy optimisation.

Manufactured from lightweight polymers, they deliver high strength-to-weight ratios, impressive axial pull-out loads, and exceptional process reliability due to a large margin between installation and stripping torque, while remaining fully recyclable to support sustainable rolling stock manufacturing.

Engineered for Compliance & Performance

Whether securing aerodynamic fairings, internal grab rails, flooring systems, or battery enclosures for hybrid rolling stock, EJOT provides full technical support from initial joint design through to laboratory testing. Our fasteners are engineered to assist rail manufacturers in meeting strict weight targets without compromising on safety or structural performance.

By replacing heavy, multi-part hardware with intelligent, single-component thread-forming solutions, EJOT is helping the rail sector build faster, cleaner, and lighter.