Often referred to as castle nuts, secure these by inserting a cotter pin or safety wire through the slots and a drilled hole in your bolt for mild loosening resistance. They’re not recommended for use on parts exposed to high vibration because the pin is prone to shearing under prolonged stress. Height includes the slots. Cotter pins are not included.

Zinc-plated steel locknuts resist corrosion in wet environments.

Steel locknuts are best for dry environments, since moisture will cause them to rust. They are weldable and can be painted or finished.

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With a slim, round profile and a slotted drive, these metric nuts work in tight spots where there's no room for a wrench to turn. Instead, tighten them from the center of the nut with a slotted screwdriver. They're commonly used in electrical enclosures and on bolted flanges but are not intended for fastening jobs that require precise amounts of torque.

Made of zinc-plated steel, these nuts are strong and wear resistant. An outer layer of zinc prevents them from rusting in wet environments, but avoid exposing them to salt water and chemicals. All meet DIN 546, an international standard for round nut dimensions.

For technical drawings and 3-D models, click on a part number.

These nuts can be attached at any point on a threaded rod for quick installation. Swivel the nut open and position it on the threaded rod, then twist closed to secure. They're zinc plated to resist corrosion in wet environments.

For technical drawings and 3-D models, click on a part number.