Castle Nuts

Castle Nuts, also known as Castellated Nuts, are specially designed locking nuts with slots (castellations) on the top surface. These slots allow the use of a cotter pin or safety wire, ensuring positive locking and preventing loosening under vibration or dynamic loads.

At UPS Lakshmi, we manufacture MS-standard Castle Nuts and Self-Locking Castellated Nuts like MS17825, MS17826, and more suitable for demanding aerospace and high-reliability industrial assemblies.

Key Features

Positive locking using cotter pin / safety wire
Excellent resistance to vibration & axial movement
High dimensional accuracy & consistent thread quality
Suitable for critical load-bearing assemblies
Manufactured under strict quality controls

Materials & Finishes

A286 Stainless Steel – High strength, corrosion resistant, heat resistant
AISI 4130 / 8740 Alloy Steel – High toughness and fatigue resistance
Surface Treatments:
- Silver Plating
- Passivation
- Custom finishes as per customer requirement

Applications

Aircraft structural assemblies
Control systems & linkages
Landing gear mechanisms
Defense & aerospace hardware
High-vibration industrial systems

Why Choose UPS Lakshmi?

With over 65+ years of manufacturing expertise, UPS Lakshmi specializes in precision-engineered fasteners that meet stringent global standards. Our castle nuts are manufactured with tight dimensional control, consistent material quality, and proven reliability in demanding environments.

✔ Aerospace & automotive-grade quality
✔ Global standards compliance
✔ Custom sizes, materials & finishes available