MS28775-218 - Military Standard O-Ring

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MS28775-218 - Military Standard O-Ring

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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.
Note: Always refer to official aircraft documentation and consult certified aviation professionals for installation and maintenance procedures.
Dimensions
Dimensions (W x H x D) 1.5" x 1.5" x 1.5" Inches
Length 1.5" Inches
Weight 0.001 lb
Specifications
ATA Chapter 51 ATA Standard Practices and Structures
Available Conditions NE/NS
Cage Code 96906
Country of origin United States of America
ECCN / USML Ear99
Hazmat Code Not applicable
Hazmat(Y/N) N
Material Rubber Butadiene-Acrylonitrile Class NBR
NSN 5331-00-584-0263
Schedule B 4016.93.0000
Total Shelf Life (days) Not applicable
Type O-Ring
Units of Measure (UoM) Each
Brand Military Standards
Color Black
Condition status Depreciated