Connect standard-sized steel and cast iron pipe flanges. These kits come with the right size and number of screws and nuts for the bolt holes in each pipe size. For a tight seal, you’ll also need a gasket between the flanges. All screws and nuts meet ASTM and ASME standards or DIN standards for material quality and dimensions. Screw length is measured from under the head.

Zinc-plated fasteners resist corrosion in wet environments.

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

Connect standard-size stainless steel or aluminum pipe flanges with these kits—they come with 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. Made from 316 stainless steel, the fasteners in these kits have excellent resistance to chemicals and salt water. They may also be mildly magnetic. For a complete connection, you’ll also need a gasket. Screw length is measured from under the head.

All screws and nuts meet ASTM A193 or A194 standards for high-pressure and high-temperature applications. They also meet ASME B18.2.1 standards for dimensions.

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.

18-8 stainless steel fasteners are more corrosion resistant than zinc-plated steel fasteners and ideal for wet and outdoor environments. They have good chemical resistance and may be mildly magnetic.

Everything you need to make a complete joint in wet and outdoor conditions. These screws come with compatible nuts and washers. Made of 18-8 stainless steel, they resist corrosion from mild chemicals and water. They may be mildly magnetic. Washers distribute the pressure from a tightened nut over the surface of your material, which helps prevent damage. All screws and nuts meet ASTM specifications for material quality and ASME specifications for dimensions. Screw length is measured from under the head.

Twice as strong as low-strength steel screws, these Grade 5 screws are suitable for fastening most machinery and equipment. They come with matching nuts and washers so you can make a complete joint. All are zinc plated to prevent corrosion in wet environments. Washers distribute the pressure from a tightened nut over the surface of your material, which helps prevent damage. Screws and nuts meet SAE specifications for material quality and ASME specifications for dimensions. For quick identification, the screw heads are marked with three radial lines. Length is measured from under the head.

Keep the most common sizes of hex head screws, nuts, and washers on hand. The length of the screws is measured from under the head.

Assortments with multiple thread sizes help you replace damaged fasteners when you don’t have a thread checker handy—just test out sizes until you find what you need. Those that come in a cabinet have two removable drawers. Assortments with one thread size include screws in a variety of lengths.

Grade 5 and Class 8.8 steel fasteners are suitable for use on most machinery and equipment. Grade 8 and Class 10.9 steel fasteners can be used in high-stress applications, such as valves, pumps, motors, and automotive suspension systems. They are at least 25% stronger than Grade 5 and Class 8.8 steel fasteners.

Zinc-plated steel and zinc yellow-chromate plated steel fasteners resist corrosion in wet environments. They’re a good choice for most applications.

18-8 stainless steel fasteners are more corrosion resistant than zinc-plated and zinc yellow-chromate plated steel fasteners, so they’re better for outdoor use. They have good chemical resistance and may be mildly magnetic.

Match the thread spacing of mating components. Coarse threads are the industry standard; choose these fasteners if you don’t know the pitch or threads per inch. Fine threads are closely spaced to prevent loosening from vibration.

Keep a variety of flanged screws and nuts on hand so you always have the size you need. The flange distributes pressure where the fastener meets a surface, so you don’t need a separate washer. They come in a metal box with a removable tray. Screw length is measured from under the flange.

Grade 5 and Class 8.8 steel fasteners are suitable for fastening most machinery and equipment. They’re plated with either zinc or zinc yellow chromate to resist corrosion in wet environments.

Grade 8 and Class 10.9 steel fasteners can be used in high-stress applications, such as on valves, pumps, and motors. They’re about 25% stronger than Grade 5 and Class 8.8 steel fasteners, but they'll corrode in wet environments. 18-8 stainless steel fasteners are ideal for wet and outdoor environments. They have good chemical resistance and may be mildly magnetic.