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Technical Data Sheet
PartsTable / O-RING / AS568-438
AS568-438 ✓ 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, outside_diameter: 6.775 INCHES NOMINAL IN, center_hole_diameter: 6.185 INCHES MINIMUM AND 6.265 INCHES MAXIMUM IN, cross-sectional_height: 0.269 INCHES MINIMUM AND 0.281 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-00-420-9624, 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
AS568-438
NSN: 5331-00-420-9624
FSC: 5331 — O-RING
CAGE: 81343 — SOCIETY OF AUTOMOTIVE ENGINEERS INC (USA)
SPECIFICATIONS
materialRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
outside_diameter6.775 INCHES NOMINAL IN
center_hole_diameter6.185 INCHES MINIMUM AND 6.265 INCHES MAXIMUM IN
cross-sectional_height0.269 INCHES MINIMUM AND 0.281 INCHES MAXIMUM IN
NSN5331-00-420-9624
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: AS568-438 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: 6.775 INCHES NOMINAL IN
•
MATERIAL: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
•
CROSS-SECTIONAL HEIGHT: 0.269 INCHES MINIMUM AND 0.281 INCHES MAXIMUM IN
•
CENTER HOLE DIAMETER: 6.185 INCHES MINIMUM AND 6.265 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
OUTSIDE DIAMETER6.775 INCHES NOMINAL IN
MATERIALRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
CROSS-SECTIONAL HEIGHT0.269 INCHES MINIMUM AND 0.281 INCHES MAXIMUM IN
CENTER HOLE DIAMETER6.185 INCHES MINIMUM AND 6.265 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 20
28682Interchangeable
interchangeable cross-reference
interchangeable
031-021-02Interchangeable
interchangeable cross-reference
interchangeable
8057Interchangeable
interchangeable cross-reference
interchangeable
B137075Interchangeable
interchangeable cross-reference
interchangeable
137075Interchangeable
interchangeable cross-reference
interchangeable
5246Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is AS568-438?
AS568-438 is a O-RING.
What parts can replace AS568-438?
There are 20 known substitutes for AS568-438: 28682, 031-021-02, 8057 and 17 more. Substitute compatibility should be verified for your specific system.
Is AS568-438 still available?
AS568-438 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