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AS568A-390 — O-RING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

AS568A-390: O-RING.

The O-RING is a the manufacturer industrial component. Key specifications include material: RUBBER ETHYLENE-PROPYLENE-DIENE CLASS EPDM, center_hole_diameter: 21.0 INCHES NOMINAL IN, cross-sectional_height: 0.188 INCHES NOMINAL IN, end_item_identification: 7010-01-605-1986; COMMAND AND CONTROL SYSTEM, part_name_assigned_by_controlling_agency: O RING. This part is cataloged in the U.S.

Government catalog under NSN 5331-01-656-0609, 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
AS568A-390
NSN: 5331-01-656-0609
FSC: 5331 — O-ring
CAGE: 5MNN7 — RTD SEALS CORP DIV HERCULES OEM (USA)
SPECIFICATIONS
materialRUBBER ETHYLENE-PROPYLENE-DIENE CLASS EPDM
center_hole_diameter21.0 INCHES NOMINAL IN
cross-sectional_height0.188 INCHES NOMINAL IN
end_item_identification7010-01-605-1986; COMMAND AND CONTROL SYSTEM
part_name_assigned_by_controlling_agencyO RING
NSN5331-01-656-0609
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: AS568A-390 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: 0.188 INCHES NOMINAL IN
•
CENTER HOLE DIAMETER: 21.0 INCHES NOMINAL IN
•
MATERIAL: RUBBER ETHYLENE-PROPYLENE-DIENE CLASS EPDM
TECHNICAL CHARACTERISTICS
CROSS-SECTIONAL HEIGHT0.188 INCHES NOMINAL IN
CENTER HOLE DIAMETER21.0 INCHES NOMINAL IN
PART NAME ASSIGNED BY CONTROLLING AGENCYO RING
END ITEM IDENTIFICATION7010-01-605-1986; COMMAND AND CONTROL SYSTEM
MATERIALRUBBER ETHYLENE-PROPYLENE-DIENE CLASS EPDM
OTHER ITEMS IN FSC 5331 — O-ring
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5331-00-001-1971 5331-00-001-1979 5331-00-001-3904 5331-00-001-3905 5331-00-001-3906 5331-00-001-3908 5331-00-001-3923 5331-00-001-3924
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is AS568A-390?
AS568A-390 is a O-RING.
What is the NSN for AS568A-390?
AS568A-390 is cataloged in the U.S. Government catalog under NSN 5331-01-656-0609. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.