These screws, which are made of stainless steel, may be slightly magnetic and have good chemical resistance. Under the head, the length is measured.
The finish of black-oxide stainless steel screws is matte-black.
A2 stainless steel screws are another name for SS304 screws.
A4 stainless steel screws are another name for SS316 screws.
If you are unsure of the pitch or 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.
Dimensional specifications are met by screws that adhere to ASME B1.1, ASME B18.3, ISO 21269, and ISO 4762 (previously DIN 912).