self drilling screw with washer

The Metal Butterfly Screw, often referred to as a butterfly nut, is a type of fastener distinguished by its unique shape resembling a butterfly's wings. This design choice is not merely cosmetic; it serves a practical purpose. Its broad, flat surfaces provide an extensive contact area, ensuring a secure and evenly distributed grip when tightened or loosened. The symmetrical structure allows for easy manipulation, even in tight spaces, making it a popular choice in various industries, from automotive to aerospace.

...

In construction, EPDM washered fasteners are extensively used in roofing applications. They effectively seal joints and connections, safeguarding structures from water damage and maintaining integrity under extreme weather conditions. Their ability to withstand UV radiation makes them a preferred choice for outdoor installations. Similarly, in automotive industries, they play a crucial role in sealing engine compartments and other areas exposed to high temperatures and harsh chemicals.

...

Chipboard, also known as particleboard, is a widely used material due to its affordability and versatility. However, its density and composition require specialized fasteners to ensure secure fixing. The 50 mm size refers to the length of the screw, which is 50 millimeters from the head to the tip. This length is typically ideal for thicker chipboard pieces, allowing for adequate penetration into the material without compromising structural integrity.

...