These screws are lightweight, nonconductive, and resistant to chemicals and oils. Under the head, the length is measured.

When nylon screws are exposed to moisture, they may expand. Glass-filled nylon screws are twice as robust as regular nylon screws because they are strengthened with fiberglass. Compared to nylon screws, polypropylene screws are more resistant to alkali, acids, and grease. They won't absorb moisture like nylon does. Plastic screws can tolerate temperatures as high as 500° F and are twice as robust as regular nylon screws. Compared to polypropylene screws, they are more chemically resistant.

If you are unsure of the pitch or threads per inch, go with screws with coarse threads, which are the industry norm.