MS17826-3 Self-Locking Castellated Hex Nut is a military standard aircraft fastening component designed to provide secure and reliable threaded retention in aerospace structural and mechanical assemblies. This thin castellated nut incorporates a non-metallic self-locking insert that helps prevent loosening caused by vibration, shock, and cyclic loading during aircraft operation.

Manufactured in accordance with the MS17826 specification, this nut features a 10-32 UNJF thread size and a slotted hexagonal design for standard wrench installation. The prevailing torque locking feature eliminates the need for additional locking devices while maintaining reliable fastener retention in demanding aviation environments.

The MS17826-3 nut is commonly used in aircraft airframe structures, control systems, equipment installations, access panels, brackets, and other assemblies where a lightweight, vibration-resistant fastening solution is required. The castellated design allows compatibility with safety wiring or cotter pin applications when specified by the aircraft maintenance procedure.

During maintenance inspections, the nut should be checked for thread condition, corrosion, damage, and proper locking capability. Replacement is recommended if the self-locking feature is worn or if the nut no longer provides the required prevailing torque.

Key Features

- Part Number: MS17826-3
- Manufacturer: Military Standard (MS) / Approved Aviation Hardware Manufacturer
- Component: Self-Locking Castellated Hex Nut
- Thread Size: 10-32 UNJF
- Locking Feature: Non-metallic insert prevailing torque lock
- Material: Alloy steel nut with polyamide locking insert
- Finish: Cadmium plated with chromate protection
- Design: Thin slotted hex nut for aircraft fastening applications
- Temperature Rating: Suitable for applications up to 250°F
- Suitable for aircraft structures, control systems, and general aerospace assembly applications