MS17826 – A Trusted Standard in Castellated Aerospace Nuts

July 23, 2025

What is MS17826?

MS17826 is a U.S. Military Standard (MS) fastener specification designed specifically for aerospace and defense applications. It refers to a self-locking, hexagonal, castellated nut with a thin profile and non-metallic insert, ideal for locking under high-vibration and dynamic stress conditions.
MS17826 is also referred to as a castellated self-locking nut in aerospace, and is commonly used in aircraft structures and military-grade assemblies.

Updated insights on MS17826 usage in 2025 aerospace programs.

These nuts are commonly used in:

Aircraft structural assemblies
Engine mounts
Landing gear systems
Defense equipment

Key Features of MS17826 Castellated Nut

Specification: MS17826 (MIL-SPEC)
Shape: Hexagon, thin-profile, castellated slots
Locking Type: Self-locking with non-metallic insert
Material: AISI 4130 / AISI 8740 alloy steel
Finish: Cadmium plating, Passivation (or as required)
Applications: Aerospace, Aviation, Military Hardware

Manufacturer of MS17826 – UPS Lakshmi

UPS Lakshmi is an AS9100D & ISO 9001 certified manufacturer of MS17826 castellated nuts. With over 65 years of precision manufacturing experience, we deliver aerospace-grade fasteners that meet stringent industry standards.

We supply to major OEMs across:

Commercial and military aviation
Defense contracts
Global aerospace distributors

Custom Aerospace Fasteners Available

In addition to standard fasteners, UPS Lakshmi specializes in manufacturing custom aerospace parts and precision machined components as per:

Project-specific requirements
Customer drawings
Defense tenders

All components are developed in our in-house facility using forging, CNC machining, heat treatment, and inspection — ensuring 100% quality compliance.

🔗 Looking to Buy MS17826 Castellated Nut?

✅ Looking to buy MS17826 Castellated Nut for your aerospace project?
Explore full technical specifications and certified manufacturing details on our product page.
UPS Lakshmi is a trusted manufacturer of MS17826 fasteners in India.