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Technical Data Sheet
PartsTable / O-RING / MS28778-20
MS28778-20 ✓ 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 SYNTHETIC OVERALL, temp_rating: -65.0 FAHRENHEIT AND 160.0 FAHRENHEIT DEGF, hardness_rating: 90.0 SHORE DUROMETER A NOMINAL OVERALL, outside_diameter: 1.711 INCHES NOMINAL IN, peripheral_diameter: 1.711 INCHES NOMINAL IN, center_hole_diameter: 1.465 INCHES MINIMUM AND 1.485 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-00-803-7208, 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
MS28778-20
NSN: 5331-00-803-7208
FSC: 5331 — O-RING
CAGE: D9182 — ZF INDUSTRIEANTRIEBE WITTEN GMBH (DEU)
SPECIFICATIONS
materialRUBBER SYNTHETIC OVERALL
temp_rating-65.0 FAHRENHEIT AND 160.0 FAHRENHEIT DEGF
hardness_rating90.0 SHORE DUROMETER A NOMINAL OVERALL
outside_diameter1.711 INCHES NOMINAL IN
peripheral_diameter1.711 INCHES NOMINAL IN
center_hole_diameter1.465 INCHES MINIMUM AND 1.485 INCHES MAXIMUM IN
elongation_percentage80 MAXIMUM
cross-sectional_height0.114 INCHES MINIMUM AND 0.122 INCHES MAXIMUM IN
criticality_code_justificationZZZY
reference_number_differentiating_characteristicsCLEANING, PACKAGING, AND MARKING IAW MIL-STD-1330D
NSN5331-00-803-7208
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: MS28778-20 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 24
22512Interchangeable
interchangeable cross-reference
interchangeable
D62Interchangeable
interchangeable cross-reference
interchangeable
88604Interchangeable
interchangeable cross-reference
interchangeable
S16042AInterchangeable
interchangeable cross-reference
interchangeable
D-602Interchangeable
interchangeable cross-reference
interchangeable
B94.19 TABLE 41Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS28778-20?
MS28778-20 is a O-RING.
What parts can replace MS28778-20?
There are 24 known substitutes for MS28778-20: 22512, D62, 88604 and 21 more. Substitute compatibility should be verified for your specific system.
Is MS28778-20 still available?
MS28778-20 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