1 4 20 double end stud

A Tek screw, also known as a self-tapping screw, is a specialized type of screw designed with a sharp point and thread that cuts into the material it's screwed into, eliminating the need for pre-drilling. The 4-inch variant is particularly popular due to its versatile length and load-bearing capacity. It strikes a balance between being long enough to provide substantial hold in thicker materials while remaining compact enough for use in various projects.

...

However, despite their numerous advantages, it is essential to note that nylon self-tapping screws have their limitations. They may not be suitable for high-stress or load-bearing applications, nor for outdoor use where exposure to UV light can weaken the material over time. Therefore, selecting the right type of screw for a particular application requires careful consideration of the material, environmental conditions, and the expected load or stress.

...