MS21042L5 - Nut

Part number MS21042L5 is a military-standard all-metal self-locking flanged hex nut designed for lightweight, high-reliability fastening applications in aerospace and vibration-intensive environments. The integral flange distributes clamp load over a larger surface area, reducing the need for a separate washer while improving joint stability and resistance to loosening.

The prevailing-torque locking feature provides secure thread retention under vibration, shock, and repeated operational cycling. This style of nut is commonly used in aircraft structures, engine assemblies, avionics equipment, and other critical fastening systems requiring dependable locking performance.

Dimensions

• Inside Diameter (Thread ID): 6.99 mm
• Outside Diameter (Flange OD): 11.78 mm
• Height: 5.59 mm

Configuration

• Type: Self-locking flanged hex nut
• Standard: MS21042 military specification
• Series: L5 lightweight configuration
• Thread Style: Internal machine thread
• Locking Method: All-metal prevailing torque design
• Material: Alloy steel / aerospace-grade metal construction
• Finish: Dark corrosion-resistant protective coating
• Features: Integral washer flange, vibration resistant, lightweight profile, reusable locking action
• Applications: Aircraft structures, aerospace hardware, avionics mounting, engine systems, and high-strength mechanical assemblies