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Technical Data Sheet
PartsTable / O-RING / MS28778-24
MS28778-24 ✓ Verified by PartsTable
— · ORING SEAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW

The O-RING is a the manufacturer industrial component. Key specifications include material: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR, hardness_rating: 90.0 SHORE DUROMETER A NOMINAL, outside_diameter: 1.934 INCHES MINIMUM AND 1.978 INCHES MAXIMUM IN, special_features: MS28778 SUPERSEDED BY SAE-AS28778, 1 MAR 2006, center_hole_diameter: 1.710 INCHES MINIMUM AND 1.730 INCHES MAXIMUM IN, cross-sectional_height: 0.114 INCHES MINIMUM AND 0.122 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-00-819-5111, indicating validated use in U.S.

government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels. Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
MS28778-24
NSN: 5331-00-819-5111
FSC: 5331 — O-RING
CAGE: 5N582 — SEAL DYNAMICS LLC (USA)
SPECIFICATIONS
materialRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
hardness_rating90.0 SHORE DUROMETER A NOMINAL
outside_diameter1.934 INCHES MINIMUM AND 1.978 INCHES MAXIMUM IN
special_featuresMS28778 SUPERSEDED BY SAE-AS28778, 1 MAR 2006
center_hole_diameter1.710 INCHES MINIMUM AND 1.730 INCHES MAXIMUM IN
cross-sectional_height0.114 INCHES MINIMUM AND 0.122 INCHES MAXIMUM IN
end_item_identificationMRAP RG-31 & ROUTE CLEARANCE VEHICLE; MEDIUM MINE PROTECTED VEHICLE - MMPV; MULTIPLE LAUNCH ROCKET SYSTEM (MLRS); A4 BRADLEY FIGHTING VEHICLE; A3 BRADLEY FIGHTING VEHICLE
part_name_assigned_by_controlling_agencyPACKING, PREFORMED, STRAIGHT THREAD TUBE FITTING
NSN5331-00-819-5111
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: MS28778-24 MFR: OEM ⚠ VERIFY BEFORE ORDERING Wrong material = failure. Viton for oil/fuel, EPDM for water/steam, Buna-N for general purpose, Silicone for food-grade. Chemical incompatibility causes swelling, brittleness, or rapid degradation ✓ BROKER TIP Durometer (hardness) affects sealing pressure tolerance. Higher Shore A = harder = higher pressure. Standard durometer is 70A — verify if application requires different hardness PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
OUTSIDE DIAMETER: 1.934 INCHES MINIMUM AND 1.978 INCHES MAXIMUM IN
•
MATERIAL: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
•
HARDNESS RATING: 90.0 SHORE DUROMETER A NOMINAL
•
CROSS-SECTIONAL HEIGHT: 0.114 INCHES MINIMUM AND 0.122 INCHES MAXIMUM IN
•
CENTER HOLE DIAMETER: 1.710 INCHES MINIMUM AND 1.730 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
OUTSIDE DIAMETER1.934 INCHES MINIMUM AND 1.978 INCHES MAXIMUM IN
PART NAME ASSIGNED BY CONTROLLING AGENCYPACKING, PREFORMED, STRAIGHT THREAD TUBE FITTING
MATERIALRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
END ITEM IDENTIFICATIONMRAP RG-31 & ROUTE CLEARANCE VEHICLE; MEDIUM MINE PROTECTED VEHICLE - MMPV; MULTIPLE LAUNCH ROCKET SYSTEM (MLRS); A4 BRADLEY FIGHTING VEHICLE; A3 BRADLEY FIGHTING VEHICLE
HARDNESS RATING90.0 SHORE DUROMETER A NOMINAL
CROSS-SECTIONAL HEIGHT0.114 INCHES MINIMUM AND 0.122 INCHES MAXIMUM IN
SPECIAL FEATURESMS28778 SUPERSEDED BY SAE-AS28778, 1 MAR 2006
CENTER HOLE DIAMETER1.710 INCHES MINIMUM AND 1.730 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 31
2528918Interchangeable
interchangeable cross-reference
interchangeable
MILP5510Interchangeable
interchangeable cross-reference
interchangeable
AMS-P-5510Interchangeable
interchangeable cross-reference
interchangeable
MIL-R-83248/2-9 24Interchangeable
interchangeable cross-reference
interchangeable
N885PC1Interchangeable
interchangeable cross-reference
interchangeable
N94-84924Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS28778-24?
MS28778-24 is a O-RING.
What parts can replace MS28778-24?
There are 31 known substitutes for MS28778-24: 2528918, MILP5510, AMS-P-5510 and 28 more. Substitute compatibility should be verified for your specific system.
Is MS28778-24 still available?
MS28778-24 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026