Use these kits to connect plastic pipe flanges—they’re sized for Class 150 flanges made to ASME B16.5 dimensions. They come with screws, nuts, and washers that match the size and number of bolt holes for each pipe size. For a complete connection, you’ll also need a gasket. All screws and nuts meet ASTM specifications for material quality and ASME specifications for dimensions. Washers distribute the pressure from a tightened nut over the surface of the flange, which helps prevent damage. Screw length is measured from under the head.

Zinc-plated steel fasteners resist corrosion in wet environments.

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. For a complete connection, you’ll also need a gasket. All fasteners meet ASME specifications for dimensions and ASTM specifications for material quality. Screw length is measured from under the head.

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

Hot-dipped galvanized steel fasteners are 10 times more corrosion resistant than zinc-plated fasteners.