NUT (P/N an320-4) - New Surplus
P/N: an320-4
Category: Fasteners & Hardware
This product requires a custom quote. Please contact our sales team for pricing information or submit an RFQ (Request for Quote).
Available Inventory
| Condition | Stock |
|---|---|
| New Surplus | 276 Available |
Product Description
The AN320-4 is a castellated shear nut conforming to AN320 specifications for 1/4-28 threads. This steel nut features radial slots that accept a cotter pin for positive mechanical locking, preventing loosening under vibration. Designed for use with drilled-shank and clevis bolts in shear-loaded structural joints throughout aircraft assemblies.
Installation requires inserting a cotter pin through the nut slots and the bolt's drilled hole, then bending the pin ends to lock. Standard practice in general and commercial aviation maintenance.
Please note: Product descriptions are provided for informational purposes. Always refer to your aircraft's Illustrated Parts Catalog (IPC) to verify part compatibility and specifications.
Frequently Asked Questions
What is the NUT (P/N an320-4)?
The AN320-4 is a castellated shear nut conforming to AN320 specifications for 1/4-28 threads. This steel nut features radial slots that accept a cotter pin for positive mechanical locking, preventing loosening under vibration.
Does the an320-4 meet AN/MS/NAS aviation specifications?
Aircraft hardware is manufactured to military and aviation specifications. The NUT conforms to its applicable AN (Air Force-Navy), MS (Military Standard), or NAS (National Aerospace Standard) specification. Contact us for specific specification details.
What material is the an320-4 manufactured from?
Aviation hardware is available in various materials including cadmium-plated steel, stainless steel, aluminum alloy, and titanium depending on the application. Contact us for material certification and specifications for the an320-4.
Can I order the an320-4 in custom quantities?
Yes, we sell hardware in various quantities from single units to bulk lots. The NUT is available in: New Surplus. Submit an RFQ for volume pricing or call (904) 998-9101 for quantity availability.