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PartsTable / O-RING / AS568-278
AS568-278 ✓ 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, hardness_rating: 70.0 SHORE DUROMETER A NOMINAL, center_hole_diameter: 11.954 INCHES MINIMUM AND 12.014 INCHES MAXIMUM IN, elongation_percentage: 250 MAXIMUM, cross-sectional_height: 0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-00-902-0917, 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
AS568-278
NSN: 5331-00-902-0917
FSC: 5331 — O-RING
CAGE: 81343 — SOCIETY OF AUTOMOTIVE ENGINEERS INC (USA)
SPECIFICATIONS
materialRUBBER SYNTHETIC
hardness_rating70.0 SHORE DUROMETER A NOMINAL
center_hole_diameter11.954 INCHES MINIMUM AND 12.014 INCHES MAXIMUM IN
elongation_percentage250 MAXIMUM
cross-sectional_height0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
NSN5331-00-902-0917
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: AS568-278 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: 0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
•
CENTER HOLE DIAMETER: 11.954 INCHES MINIMUM AND 12.014 INCHES MAXIMUM IN
•
MATERIAL: RUBBER SYNTHETIC
•
ELONGATION PERCENTAGE: 250 MAXIMUM
•
HARDNESS RATING: 70.0 SHORE DUROMETER A NOMINAL
TECHNICAL CHARACTERISTICS (FLIS)
CROSS-SECTIONAL HEIGHT0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
CENTER HOLE DIAMETER11.954 INCHES MINIMUM AND 12.014 INCHES MAXIMUM IN
MATERIALRUBBER SYNTHETIC
ELONGATION PERCENTAGE250 MAXIMUM
HARDNESS RATING70.0 SHORE DUROMETER A NOMINAL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
5304-0300Interchangeable
interchangeable cross-reference
interchangeable
008Interchangeable
interchangeable cross-reference
interchangeable
S8057AY3Interchangeable
interchangeable cross-reference
interchangeable
MS29561Interchangeable
interchangeable cross-reference
interchangeable
S8171K27Interchangeable
interchangeable cross-reference
interchangeable
SAE-AS29561Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is AS568-278?
AS568-278 is a O-RING.
What parts can replace AS568-278?
There are 11 known substitutes for AS568-278: 5304-0300, 008, S8057AY3 and 8 more. Substitute compatibility should be verified for your specific system.
Is AS568-278 still available?
AS568-278 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