The **MS16625 series of self-locking hex nuts** represents a critical category of military-standard aviation hardware, designed to maintain secure fastening under dynamic conditions where vibration, temperature fluctuations, and structural stresses are prevalent. This standard part often supersedes or is interchangeable with various legacy AN (Army-Navy) and NAS (National Aerospace Standard) fasteners, providing a reliable solution for critical assemblies across numerous aircraft platforms.
Overview
The MS16625 is a specific military standard for an all-metal, prevailing torque, self-locking hex nut. These nuts are engineered to resist loosening when subjected to vibration and varying loads, making them indispensable in aircraft engine assemblies, airframe structures, and control systems. Unlike nuts that rely on nylon inserts for their locking feature, the MS16625 achieves its prevailing torque through a precisely deformed thread or an elliptical collar, ensuring consistent locking performance even in high-temperature environments where nylon could degrade. Its primary role is to provide a robust, vibration-resistant connection, crucial for the long-term integrity and safety of aircraft components.
Specifications
- Type: Self-locking, all-metal, prevailing torque hex nut.
- Material: Typically manufactured from high-strength steel or Corrosion-Resistant
- Stock: Out of Stock - On Backorder
- Manufacturer Part #: MS16625
- Part#: MS16625
Aircraft Fitment Finder
Returns & refund summary
- 30-day return window — with prior return authorization, unopened in original packaging.
- Restocking fee: 20% on unopened items, 30% on open-box items.
- Refund processing fee: 5.51% applies to all refunds (returns, cancellations, core-fee refunds) regardless of reason.
- Return shipping: paid by buyer.
- Non-returnable categories: installed/used parts, special-order or rebuilt items, programmed items (incl. ELTs), batteries, AOG-priority orders, international orders.
Full terms: Return Policy.
Authenticity & authorization
All parts sold by American Aviation Parts are genuine factory products sourced through authorized distribution channels. Our authorization status varies by brand — for some brands we are a direct authorized dealer; for others we are an independent reseller through authorized distribution. Either way, the part you receive is the same factory product, with standard documentation available on request.
See our full Manufacturer Authorizations page for the current per-brand status.
Need traceability paperwork?
If your installation requires FAA Form 8130-3, manufacturer Certificate of Conformance, or other traceability documentation, please call 1-877-722-8727 or email [email protected] before placing the order so we can confirm what is available for this part.
Shipping
Standard ground, expedited, and AOG shipping options are available at checkout. Full shipping-cost tiers and timelines are published on our Delivery Information page.
