Thread Type: Metric / UNC / UNF

Strength Grade: 5 / 8 / 10 / A2-70 / A4-80

Surface Treatment: Zinc Plated / HDG / Black / Plain

Standard: DIN 935 / DIN 937 / ISO 7035

Locking Method: Cotter Pin Locking

Working Temperature: -50°C to 300°C

Product Detail | Technical Information | Packaging

Product Detail1

Shanghai Metal Corporation is a leading manufacturer and supplier of Slotted Nut / Castle Nut.

Slotted Nut, also known as Castle Nut, is a mechanical locking fastener designed to prevent loosening under vibration and dynamic loads. The top of the nut is machined with slots that align with a hole drilled through the bolt or shaft. A cotter pin is inserted through the slots and bolt hole, creating a positive mechanical lock that ensures maximum safety.

Compared with friction-based locking systems, this structure provides a more reliable anti-loosening solution, especially in rotating or load-bearing assemblies. Slotted nuts are widely used in automotive, construction machinery, heavy equipment, marine, and industrial applications.

The product can be manufactured in carbon steel, alloy steel, or stainless steel, with various surface treatments to meet corrosion resistance requirements. We support customization according to international standards, thread types, and strength grades.

If you want to know more about our fastener products or prices, please feel free to contact us. We will reply you within 24 hours.

1.Thread Size: M6–M100 / 1/4”–4”.
2.Material: Carbon Steel / Stainless Steel / Alloy Steel.
3.Strength Grade: 5 / 8 / 10 / A2-70 / A4-80.
4.Surface Treatment: Zinc Plated / HDG / Black Oxide / Plain.

1.Mechanical Locking Design: Works with cotter pin for anti-loosening.
2.High Safety Performance: Ideal for vibration and dynamic loads.
3.Strong Durability: Corrosion-resistant material options available.
4.Standard Compatibility: Produced according to DIN / ISO standards.

1.Automotive systems: Steering and suspension assemblies.
2.Heavy machinery: Rotating shafts and load-bearing joints.
3.Construction equipment: Structural fastening.
4.Marine industry: Equipment exposed to vibration and corrosion.

Technical Information of Slotted Nut/Castle Nut

Slotted nuts, also known as castle nuts, are mechanical locking fasteners designed to prevent loosening under vibration, rotation, or dynamic loads. The top of the nut is machined with slots that align with a hole drilled through the bolt or shaft. After tightening, a cotter pin is inserted through the slots and bolt hole, forming a positive mechanical lock. This method provides a more reliable anti-loosening solution compared with friction-based locking systems.

Slotted nuts are typically manufactured in carbon steel, alloy steel, or stainless steel, with various surface treatments for corrosion resistance. They are widely used in safety-critical assemblies such as automotive steering systems, machinery shafts, construction equipment, and heavy-duty mechanical structures where secure fastening is essential.

Packaging of Slotted Nut/Castle Nut

Shanghai Metal Products are packed and labeled according to the regulations and customer's requests. Great care is taken to avoid any damage which might be caused during storage or transportation. In addition, clear labels are tagged on the outside of the packages for easy identification of the product I. D. and quality information.

1) Shanghai Metal Standard

2) Customization

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Slotted Nut/Castle Nut

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