When a wrench won’t fit, turn these screws with a slotted screwdriver instead. Made from nylon, they’re chemical and oil resistant, nonconductive, and lightweight. However, they’re not recommended for high-strength fastening. They’re best for dry environments since they’ll swell and weaken when exposed to moisture. All screws meet ASME standards for dimensions. Length is measured from under the head.

Match the thread spacing of mating components. Coarse threads are the industry standard; choose these screws if you don’t know the pitch or threads per inch.