NUTS

High Performance Fasteners

Nuts are a key component in fastening systems, providing tightness, strength and security in the most demanding applications. EFS provides special custom-made nuts made from high-quality materials and available with different surface treatments to improve mechanical performance and corrosion resistance.

Main features of our special nuts:

  • Custom sizes
    Available in a variety of sizes to fit any fastening requirement

  • High-quality materials
    Stainless steels, special steels and high-performance alloys

  • Surface treatments
    Galvanizing, burnishing, zinc-nickel, geomet® and anti-corrosion coatings

  • High mechanical strength
    Nuts suitable for heavy-duty use in industries such as mechanical engineering, automotive, construction and plant engineering

REFERENCE STANDARDS

  • UNI
    5587, 5588, 5589, 5593, 5594

  • DIN
    439, 934, 980, 982, 985, 2510

  • UNI
    5593, 5594

  • ANSI
    B18.2.2

  • ISO
    4032

MATERIALS

  • CL 8, 10, 12

  • ASTM A194 2A

  • GR 7, GR 8

HEXAGONAL NUTS

Hex nuts for custom bolts

EFS - Prodotti - Dadi esagonali

Hexagonal nuts are among the most widely used in industry to provide strong and secure fasteners. They can be made in different strength classes and materials, with metric, UNC or custom threads to customer specifications.

SELF-LOCKING NUTS

Special self-locking nuts

EFS - Prodotti - Dadi autobloccanti

Designed to prevent loosening due to vibration and stress, self-locking nuts feature nylon inserts or metal locking systems that provide a reliable seal even under extreme conditions.

FLANGED NUTS

Custom flange nuts for high-performance fasteners

EFS - Prodotti - Dadi flangiati

Flanged nuts feature an enlarged base that distributes the load over a larger area, reducing the risk of loosening. They are particularly suitable for applications that require excellent vibration resistance.

DRAWING NUTS

Custom design nuts for technical hardware

EFS - Prodotti - Dado speciale su misura per bulloneria industriale

When standard solutions are not enough, we make custom-designed nuts, adapting them to specific dimensional and mechanical requirements. Each nut can be produced with special geometries, treatments and materials to ensure optimal performance.

CAP NUTS

Cap nuts for protection and safety

EFS - Prodotti - Dadi a calotta

This type of nut features a closed construction that protects the thread from dust, dirt and moisture. Ideal for aesthetic and security applications, the cap nut is available in a variety of finishes and materials.

CROWN NUTS

Special crown nuts for secure fastenings

EFS - Prodotti - Dadi a corona

Crown nuts are designed for use with cotter pins or mechanical locking systems. This configuration makes them ideal for applications where secure fastening is essential, such as in transmission systems and structural connections.

NEED A PARTNER FOR SPECIAL BOLTS?

We supply custom-designed fasteners for critical applications — with certified quality, full traceability, and technical support.
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Customized special nuts

Our range of custom-made special nuts is designed to ensure maximum reliability and high performance in every context. With selected materials and advanced manufacturing processes, our nuts offer customized solutions for every technical requirement.

Rely on EFS to supply custom-made nuts that ensure safety and durability, with the option of dedicated surface treatments and quality certifications.

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