More than twice as robust as stainless steel wire-lockable screws and stronger than Grade 8 steel screws, the alloy steel screws have a tensile strength of 170,000 psi. In arid conditions, their black-oxide coating offers a moderate level of corrosion protection. Connect these screws via the head's hole for greater vibration resistance than any other socket head screw (wire supplied separately). The dimensions are in accordance with ASME B18.3. Under the head, the length is measured.

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.