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Technical Data Sheet
PartsTable / COMPONENT / 668879
668879 ✓ 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 GASKET is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY OVERALL, hardness_rating: 60.0 SHORE DUROMETER A NOMINAL OVERALL, outside_diameter: 4.500 INCHES NOMINAL IN, aperture_diameter: 2.500 INCHES NOMINAL IN, surface_treatment: ANODIZE OVERALL, gage_ring_thickness: 0.125 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-085-2345, 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
668879
NSN: 5330-00-085-2345
FSC: 5330
CAGE: 83259 — PARKER-HANNIFIN CORPORATION DBA PNEUTRONICS DIV COMPOSITE SEALING SYSTEMS DIVISION (USA)
SPECIFICATIONS
materialALUMINUM ALLOY OVERALL
hardness_rating60.0 SHORE DUROMETER A NOMINAL OVERALL
outside_diameter4.500 INCHES NOMINAL IN
aperture_diameter2.500 INCHES NOMINAL IN
surface_treatmentANODIZE OVERALL
gage_ring_thickness0.125 INCHES NOMINAL IN
bolt_circle_diameter3.500 INCHES NOMINAL IN
cross-sectional_thickness0.177 INCHES NOMINAL IN
cross-sectional_shape_styleMETAL AND SYNTHETIC RUBBER
material_document_and_classificationQQ-A-250/11 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationMIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5330-00-085-2345
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 668879 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
•
BOLT CIRCLE DIAMETER: 3.500 INCHES NOMINAL IN
•
CROSS-SECTIONAL SHAPE STYLE: METAL AND SYNTHETIC RUBBER
•
CROSS-SECTIONAL THICKNESS: 0.177 INCHES NOMINAL IN
•
APERTURE DIAMETER: 2.500 INCHES NOMINAL IN
•
GAGE RING THICKNESS: 0.125 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-A-250/11 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
MATERIAL: ALUMINUM ALLOY OVERALL
•
OUTSIDE DIAMETER: 4.500 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
BOLT CIRCLE DIAMETER3.500 INCHES NOMINAL IN
CROSS-SECTIONAL SHAPE STYLEMETAL AND SYNTHETIC RUBBER
CROSS-SECTIONAL THICKNESS0.177 INCHES NOMINAL IN
APERTURE DIAMETER2.500 INCHES NOMINAL IN
GAGE RING THICKNESS0.125 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-250/11 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
MATERIALALUMINUM ALLOY OVERALL
OUTSIDE DIAMETER4.500 INCHES NOMINAL IN
SURFACE TREATMENTANODIZE OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
40309Interchangeable
interchangeable cross-reference
interchangeable
65A81C938Interchangeable
interchangeable cross-reference
interchangeable
02261-0280-21Interchangeable
interchangeable cross-reference
interchangeable
68B618000-281Interchangeable
interchangeable cross-reference
interchangeable
4500-281Interchangeable
interchangeable cross-reference
interchangeable
65194Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 668879?
668879 is a GASKET.
What parts can replace 668879?
There are 15 known substitutes for 668879: 40309, 65A81C938, 02261-0280-21 and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 668879?
668879 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-085-2345. This indicates validated use in U.S. government and defense supply chains.
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Last verified: July 2026