MS28775-218 – Military Standard O-Ring
Overview
The MS28775-218 is a high-performance O-ring designed to meet military specifications for aerospace, hydraulic, and fuel system sealing applications. Engineered from acrylonitrile butadiene rubber (NBR), commonly known as Buna-N, this O-ring provides exceptional resistance to petroleum-based hydraulic fluids, ensuring long-lasting reliability in demanding environments.
With its precision-molded construction and compliance with military sealing standards, the MS28775-218 is a critical component in maintaining system integrity and preventing leaks under extreme pressures and temperatures.
Key Features
- Military-Grade Sealing Performance:
- Manufactured to stringent military standards for aerospace and defense applications.
- Ensures consistent and reliable sealing in critical aircraft systems.
- Material Composition – Acrylonitrile Butadiene Rubber (Buna-N):
- Resistant to petroleum-based hydraulic fluids, lubricants, and aviation fuels.
- Offers high tensile strength and durability in extreme conditions.
- Temperature & Pressure Resistance:
- Operates effectively in a temperature range of -65°F to 275°F (-54°C to 135°C).
- Maintains sealing integrity under high-pressure hydraulic and fuel systems.
- Precision-Molded Design:
- Provides a tight, leak-free fit for hydraulic fittings, valves, actuators, and fuel system components.
- Engineered for high-wear resistance, reducing maintenance and replacement frequency.
Technical Specifications
- Part Number: MS28775-218
- Material: Acrylonitrile Butadiene Rubber (Buna-N)
- Durometer Hardness: 70 Shore A
- Inside Diameter (ID): 1.234 inches
- Outside Diameter (OD): 1.512 inches
- Cross-Sectional Thickness: 0.139 inches
- Temperature Rating: -65°F to 275°F (-54°C to 135°C)
- Fluid Compatibility: MIL-H-5606 hydraulic fluid and other petroleum-based lubricants
Aircraft Compatibility & Applications
The MS28775-218 O-ring is widely used in aerospace, military, and industrial sealing applications, ensuring leak-proof operation in hydraulic and fuel systems. This O-ring plays a vital role in aircraft maintenance, repair, and overhaul (MRO), preventing fluid loss and maintaining pressure stability.
Common Applications Include:
- Hydraulic System Seals: Prevents leakage and pressure loss in high-performance aircraft hydraulic systems.
- Pneumatic System Seals: Provides airtight seals in pressurized pneumatic components and actuators.
- Fuel System Seals: Compatible with aviation fuel lines, pumps, and connectors for optimal performance.
- Landing Gear & Brake Systems: Ensures tight sealing in hydraulic braking and shock absorption mechanisms.
Why Choose the MS28775-218 Military Standard O-Ring?
The MS28775-218 meets military-grade durability and performance standards, ensuring maximum reliability in mission-critical applications. With superior resistance to fuels, hydraulic fluids, and extreme temperatures, this O-ring provides long-lasting sealing performance while minimizing maintenance and downtime.
Installation & Maintenance Considerations
- Lubrication Requirements: Use a compatible aviation-approved lubricant for proper installation and enhanced longevity.
- Regular Inspection: Periodically check for signs of wear, swelling, or degradation to ensure continued performance.
- Replacement Intervals: Replace as part of scheduled maintenance to prevent hydraulic or fuel system failures.