Spring, flat, serrated, and special washers

Washers play a crucial role in evenly distributing the load generated by the tightening of nuts and bolts, preventing surface damage and enhancing the stability of the entire assembly. Thanks to their versatility, they are widely used in industries ranging from mechanical engineering to construction, metal fabrication, and automotive applications.

BULL-VIT offers a wide selection of washers, including flat, spring, serrated, and special types. Below is an overview of the main categories available:

• spring washers:

   - grower washers (UNI 1751, DIN 127) – rectangular-section spring washers used to prevent loosening due to vibrations;
   - reinforced grower washers – an enhanced version of standard grower washers, offering increased resistance to dynamic loads;
   - curved and wave spring washers (UNI 8840, DIN 137) – designed to compensate for thermal expansion or absorb dynamic loads.

• flat washers:

   - standard (UNI 6592, DIN 125, ISO 7089);
   - structural washers (C45 UNI 5714, DIN 6916) – high-strength washers designed for structural bolts;
   - wide flat washers (UNI 6593, DIN 9021) – large-diameter washers, ideal for delicate surfaces or applications requiring high load distribution.

• serrated and schnorr washers:

   - internal and external serrated washers (UNI 8842, DIN 6798) – the serrations increase friction between surfaces, improving fastener locking;
   - schnorr (C70) – safety washers specially designed for critical applications. They provide a secure grip, even under strong vibrations.

• Belleville and special washers:

   - Belleville washers (DIN 2093-A) – conical washers that offer high load absorption capacity, ideal for high-pressure applications;
   - square plates (C45 UNI 5716, DIN 6918) – heavy-duty components for high-strength bolts, featuring a square shape to optimize force distribution over wide surfaces.

BULL-VIT supplies washers in a variety of materials, including C45 and C70 steel, A2 and A4 stainless steel, and brass. All products comply with UNI, DIN, and ISO international standards, ensuring quality, reliability, and safety. Washers come with 2.1 or 3.1 quality certificates, where available, to guarantee full material traceability. Washers are available in a wide range of standard sizes, compatible with bolts and screws from M2 to M56.

For further technical details or to request a personalized quote, contact the BULL-VIT team directly.