PartsTable
Technical Data Sheet
PartsTable / O-RING / MS-28778-8
MS-28778-8 ✓ 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 LOCKNUT,TUBE FITTING is a the manufacturer industrial component. Key specifications include special_features: CHECK VALVE, part_name_assigned_by_controlling_agency: PACKING 2 O RING. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-00-006-2249, 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
MS-28778-8
NSN: 5331-00-006-2249
FSC: 5331 — O-RING
CAGE: 81343 — SOCIETY OF AUTOMOTIVE ENGINEERS INC (USA)
SPECIFICATIONS
special_featuresCHECK VALVE
part_name_assigned_by_controlling_agencyPACKING 2 O RING
NSN5331-00-006-2249
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: MS-28778-8 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
•
CROSS-SECTIONAL HEIGHT: 0.084 INCHES MINIMUM AND 0.090 INCHES MAXIMUM IN
•
TEMP RATING: -65.0 FAHRENHEIT AND 160.0 FAHRENHEIT DEGF
•
ELONGATION PERCENTAGE: 80 MAXIMUM
•
MATERIAL: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
•
CENTER HOLE DIAMETER: 0.639 INCHES MINIMUM AND 0.649 INCHES MAXIMUM IN
•
OUTSIDE DIAMETER: 0.818 INCHES NOMINAL IN
•
HARDNESS RATING: 90.0 SHORE DUROMETER A NOMINAL
TECHNICAL CHARACTERISTICS (FLIS)
CROSS-SECTIONAL HEIGHT0.084 INCHES MINIMUM AND 0.090 INCHES MAXIMUM IN
TEMP RATING-65.0 FAHRENHEIT AND 160.0 FAHRENHEIT DEGF
ELONGATION PERCENTAGE80 MAXIMUM
MATERIALRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
CENTER HOLE DIAMETER0.639 INCHES MINIMUM AND 0.649 INCHES MAXIMUM IN
OUTSIDE DIAMETER0.818 INCHES NOMINAL IN
HARDNESS RATING90.0 SHORE DUROMETER A NOMINAL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 13
576-2200-1506657REVALINE7Interchangeable
interchangeable cross-reference
interchangeable
F-14260-8Interchangeable
interchangeable cross-reference
interchangeable
142A23S06X12RInterchangeable
interchangeable cross-reference
interchangeable
MIL-F-18866Interchangeable
interchangeable cross-reference
interchangeable
MS28778-8Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-18866Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS-28778-8?
MS-28778-8 is a LOCKNUT,TUBE FITTING.
What parts can replace MS-28778-8?
There are 13 known substitutes for MS-28778-8: 576-2200-1506657REVALINE7, F-14260-8, 142A23S06X12R and 10 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MS-28778-8?
MS-28778-8 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-00-006-2249. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026