RETAINER, PACKING BACKUP (P/N ms28773-08) - New Surplus

The MS28773-08 is a PTFE scarf-cut packing backup retainer designed to support O-rings and prevent extrusion in aircraft hydraulic tube fittings. This ring installs in a groove immediately behind the primary O-ring seal within fitting glands, containing pressure and limiting radial movement of the elastomer. Commonly used in high-pressure hydraulic systems on general and commercial aircraft.

Installation follows the applicable tube fitting maintenance manual and MS/AS specifications for groove dimensions and torque requirements.

What is the RETAINER, PACKING BACKUP (P/N ms28773-08)?

The MS28773-08 is a PTFE scarf-cut packing backup retainer designed to support O-rings and prevent extrusion in aircraft hydraulic tube fittings. This ring installs in a groove immediately behind the primary O-ring seal within fitting glands, containing pressure and limiting radial movement of the elastomer.

Does the ms28773-08 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 ms28773-08 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 ms28773-08.

Can I order the ms28773-08 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. Submit an RFQ for volume pricing or call (904) 998-9101 for quantity availability.