Twice as strong as low-strength steel screws, these Grade 5 screws are suitable for fastening most machinery and equipment. For quick identification, their heads are marked with three radial lines. All screws meet ASME B18.2.1, which means they’re made to strict dimensional standards. They also meet either ASTM A449 or SAE J429 standards for material quality. Length is measured from under the head.

Zinc-plated steel screws are a good choice for most applications. They resist corrosion in wet environments.

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

Made from Grade 8 steel, these screws can be used in high-stress applications, such as valves, pumps, motors, and automotive suspension systems. They are at least 25% stronger than medium-strength steel screws. For quick identification, their head is marked with six radial lines. Length is measured from under the head.

Zinc yellow-chromate plated steel screws are a good choice for most applications. They resist corrosion in wet environments.

Steel screws are best for dry environments, since moisture will cause them to rust. They require little surface prep before applying a finish, so you can apply your own paint or coating.

Match the thread spacing of mating components. Coarse threads are the industry standard; choose these screws if you don’t know the threads per inch. Screws that meet ASME specifications are made to strict dimensional standards. Screws that meet SAE specifications comply with testing standards for material quality.