MS21059L3 Self-Locking Nutplate is a military standard floating two-lug nutplate designed to provide a secure, vibration-resistant threaded attachment point for aircraft structures and equipment. Featuring a 10-32 thread size, this nutplate is commonly installed in areas where slight fastener misalignment must be accommodated while maintaining reliable fastening performance.

Manufactured in accordance with the MS21059 specification, the floating nut element allows limited movement within the housing, simplifying screw installation and compensating for manufacturing tolerances or minor alignment variations. The integrated self-locking feature provides prevailing torque that helps prevent fasteners from loosening under vibration, shock, and cyclic loading encountered during aircraft operation.

The two-lug mounting configuration allows the nutplate to be permanently attached to aircraft structures using rivets, creating a durable threaded anchor for repeated assembly and disassembly. MS21059 series floating nutplates are widely used on access panels, avionics installations, interior structures, fairings, engine nacelles, and other airframe applications where dependable fastening and ease of maintenance are essential.

Routine inspections should verify that the nutplate remains securely mounted, the floating element moves freely within its designed range, and the self-locking feature continues to provide the required prevailing torque. Replacement is recommended if excessive wear, thread damage, or loss of locking capability is observed.

Key Features

- Part Number: MS21059L3
- Manufacturer: Military Standard (MS) / Approved Aviation Hardware Manufacturer
- Component: Self-Locking Floating Two-Lug Nutplate
- Thread Size: 10-32 UNF
- Design: Floating nut element accommodates minor fastener misalignment
- Locking Feature: Self-locking prevailing torque for vibration-resistant fastening
- Mounting: Two-lug rivet attachment for permanent installation
- Suitable for aircraft structures, access panels, avionics, engine installations, and general airframe applications