RETAINER, PACKING BACKUP (P/N ms28773-04) - New Surplus, New
P/N: ms28773-04
Category: Studs, Inserts & Fastener 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 | 6 Available |
| New | 8 Available |
Product Description
The MS28773-04 is a PTFE backup retainer ring conforming to Military Standard MS28773. This single-turn scarf-cut ring installs in straight-thread tube fitting boss glands to support an O-ring and prevent extrusion under hydraulic pressure. Commonly used in aircraft hydraulic systems, manifolds, and tube fittings where high-pressure fluid containment is critical.
Install the retainer in the specified gland orientation with the companion O-ring per MS28773 specifications and aircraft maintenance documentation.
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 RETAINER, PACKING BACKUP (P/N ms28773-04)?
The MS28773-04 is a PTFE backup retainer ring conforming to Military Standard MS28773. This single-turn scarf-cut ring installs in straight-thread tube fitting boss glands to support an O-ring and prevent extrusion under hydraulic pressure.
Does the ms28773-04 meet AN/MS/NAS aviation specifications?
Aircraft hardware is manufactured to military and aviation specifications. The RETAINER, PACKING BACKUP 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 ms28773-04 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 ms28773-04.
Can I order the ms28773-04 in custom quantities?
Yes, we sell hardware in various quantities from single units to bulk lots. The RETAINER, PACKING BACKUP is available in: New Surplus, New. Submit an RFQ for volume pricing or call (904) 998-9101 for quantity availability.