MS29561-242 – Superior Air Parts FAA-PMA O-Ring
Available now on the Airparts.aero Marketplace.
Overview
The MS29561-242 O-Ring, manufactured by Superior Air Parts, is a FAA-PMA certified sealing component used in a wide variety of aviation engine, fuel, and hydraulic systems. Designed to provide leak-proof sealing under extreme pressures and fluctuating temperatures, this military-grade O-ring ensures consistent performance in rotary and static applications across piston-powered general aviation aircraft.
As an approved replacement for MIL-spec O-rings, the MS29561-242 is built from fuel- and oil-resistant synthetic rubber (commonly nitrile or fluorocarbon depending on application) and conforms to precise AS568 dimensional standards. Superior Air Parts provides these O-rings as part of complete gasket kits and as individual PMA parts for use in engine rebuilds, fuel system overhauls, and fluid system sealing.
Key Features
- FAA-PMA Approved: Certified replacement part for MIL-spec O-rings in certificated aircraft.
- Precision-Molded Construction: Manufactured to aerospace standards for reliable fit and sealing performance.
- Fuel, Oil, and Hydraulic Fluid Resistant: Compatible with aviation lubricants and fuels, including 100LL and Jet-A (verify material).
- High Temperature & Pressure Tolerance: Designed to perform in extreme engine bay and system environments.
- Wide Application Range: Used in Lycoming and Continental engines, fuel injectors, carburetors, pumps, and more.
- Trusted by MROs and Engine Rebuilders: Superior Air Parts PMA components are relied upon globally for overhaul and repair.
Technical Specifications
- Part Number: MS29561-242
- Manufacturer: Superior Air Parts
- Certification: FAA-PMA
- Material: Nitrile (Buna-N) or Viton (application-specific)
- Dash Number: -242
- AS568 Size Reference: #242
- Inside Diameter: Approx. 2.484 inches
- Cross Section: Approx. 0.139 inches
- Temperature Range: Typically -40°F to +250°F (material-dependent)
- Application: Sealing in static and dynamic aviation systems
Aircraft Compatibility
Used across:
- Lycoming and Continental engines
- Fuel system assemblies
- Oil pressure relief systems
- Hydraulic pump and valve installations
- General aviation airframes requiring MS29561-series O-rings
Always confirm material compatibility and dash size with engine IPC or service manual. Installation by a certified technician is recommended.
Applications
- Engine Overhaul Kits
- Fuel Injector O-Ring Replacements
- Accessory Case and Cover Sealing
- Pump and Valve Gasket Assemblies
- Oil and Hydraulic System Leak Repair
Why Choose the MS29561-242 PMA O-Ring?
- Superior Quality Materials: Long-lasting sealing against fluid migration and environmental wear.
- OEM Equivalent Performance: Meets or exceeds original equipment specifications.
- Airworthiness-Compliant: Fully traceable and installable in certificated aircraft.
- Simplified Inventory: Common size across multiple general aviation platforms.
Order Your MS29561-242 O-Ring Today
Seal critical systems with certified aviation-grade reliability.
Order the MS29561-242 O-Ring from Airparts.aero today—offering fast shipping, OEM-matching performance, and trusted FAA-PMA certification.
The MS29561-242 Superior Air Parts O-Ring is a vital part of any engine or fluid system overhaul, offering proven compatibility with general aviation piston aircraft. Engineered to FAA-PMA standards, this O-ring provides reliable sealing in both high-pressure and high-temperature conditions. Whether used in oil systems, fuel circuits, or mechanical assemblies, Superior’s certified O-rings help ensure airworthiness and operational safety. At Airparts.aero, we supply genuine, certified replacement parts to support aircraft maintenance professionals, engine builders, and fleet operators worldwide.
Always verify IPC and maintenance guidelines for correct size and compound. Use appropriate lubrication and torque during installation.
Description: O-Ring
Part Number: MS29561-242
Product Overview
A nonmetallic circular item with an aperture, having a solid round cross-section. They are used primarily for sealing. For items with other than round cross section, see packing, preformed. For noncircular items with a round cross-section, see seal, nonmetallic round section and rubber, round section.
Specifications
| Outside Diameter | : | 4.262" Inches Nominal | |
| Cross-Sectional Height | : | 0.135" Inches Minimum and 0.143" Inches Maximum | |
| Center Hole Diameter | : | 3.969" Inches Minimum and 3.999" Inches Maximum | |
| Elongation Percentage | : | 250 Maximum | |
| Hardness Rating | : | 70.0 shore durometer a nominal | |
| Material | : | Rubber butadiene-acrylonitrile class nbr |
Between AirParts' branded hardware products, and our Seller's hardware offerings, we have hundreds of thousands of hardware parts in stock.
| Dimensions | |
|---|---|
| Dimensions (W x H x D) | 4.262'' x 4.262'' x 0.143'' Inches |
| Length | 4.262'' Inches |
| Weight | 0.001 lbs |
| Specifications | |
|---|---|
| 8130-3 Eligible | No |
| ATA Chapter | 51 ATA Standard Practices |
| Available Conditions | NE |
| Cage Code | 96906 |
| Country of origin | United States |
| ECCN / USML | EAR99 |
| FAA Approval Code | STD |
| Hazmat Code | Not Applicable |
| Hazmat(Y/N) | N |
| Material | Rubber butadiene-acrylonitrile class nbr |
| NSN | 5331-00-806-3246 |
| Schedule B | 4016.93.0000 |
| Total Shelf Life (days) | 5475 |
| Type | O-Ring |
| Units of Measure (UoM) | Each |
| Brand | Military Standards |
| Condition status | Depreciated |
