About half as strong as medium-strength steel screws, these screws can be used for light duty fastening applications, such as securing access panels.

Join standard-sized steel and cast iron pipe flanges—these kits come with the screws and nuts in the right size and number to match the bolt holes. The screw heads and nuts are 10% wider than standard hex fasteners, so they spread force over a larger area, and you can tighten with more torque.

Designed for construction, these metric screws are often used to join I-beams and scaffolding. They’re Class 10.9 steel, which is at least 25% stronger than medium-strength steel.