The nylon tip, which is softer than brass and nonconductive, lessens vibration and prevents harm from metal on metal. Compared to Grade 8 steel screws, alloy steel screws have a tensile strength of 180,000 psi. In arid conditions, their black-oxide coating offers a moderate level of corrosion protection. All satisfy ASTM A574 and ASME B18.3 for material quality and dimensional requirements.

If you are unsure of the threads per inch, go with screws with coarse threads, which are the industry norm. Close spacing between fine threads keeps them from loosening due to vibration. Coarse threads are incompatible with them.