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55AC4421 ✓ 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: CORK AND RESIN NATURAL OR RESIN SYNTHETIC OVERALL, outside_diameter: 2.000 INCHES NOMINAL IN, style_designator: CIRCULAR, aperture_diameter: 1.464 INCHES MINIMUM AND 1.474 INCHES MAXIMUM IN, cross-sectional_thickness: 0.281 INCHES NOMINAL IN, cross-sectional_shape_style: SOLID SINGLE OR COMPOSITION. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-297-7246, 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
55AC4421
NSN: 5330-00-297-7246
FSC: 5330
CAGE: 23382 — FWD SEAGRAVE HOLDINGS LP (USA)
SPECIFICATIONS
materialCORK AND RESIN NATURAL OR RESIN SYNTHETIC OVERALL
outside_diameter2.000 INCHES NOMINAL IN
style_designatorCIRCULAR
aperture_diameter1.464 INCHES MINIMUM AND 1.474 INCHES MAXIMUM IN
cross-sectional_thickness0.281 INCHES NOMINAL IN
cross-sectional_shape_styleSOLID SINGLE OR COMPOSITION
material_document_and_classificationHH-C-576 CL 2 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5330-00-297-7246
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 55AC4421 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 SHAPE STYLE: SOLID SINGLE OR COMPOSITION
•
CROSS-SECTIONAL THICKNESS: 0.281 INCHES NOMINAL IN
•
STYLE DESIGNATOR: CIRCULAR
•
MATERIAL DOCUMENT AND CLASSIFICATION: HH-C-576 CL 2 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
MATERIAL: CORK AND RESIN NATURAL OR RESIN SYNTHETIC OVERALL
•
OUTSIDE DIAMETER: 2.000 INCHES NOMINAL IN
•
APERTURE DIAMETER: 1.464 INCHES MINIMUM AND 1.474 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
CROSS-SECTIONAL SHAPE STYLESOLID SINGLE OR COMPOSITION
CROSS-SECTIONAL THICKNESS0.281 INCHES NOMINAL IN
STYLE DESIGNATORCIRCULAR
MATERIAL DOCUMENT AND CLASSIFICATIONHH-C-576 CL 2 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
MATERIALCORK AND RESIN NATURAL OR RESIN SYNTHETIC OVERALL
OUTSIDE DIAMETER2.000 INCHES NOMINAL IN
APERTURE DIAMETER1.464 INCHES MINIMUM AND 1.474 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 2
20-3504Interchangeable
interchangeable cross-reference
interchangeable
301209Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 55AC4421?
55AC4421 is a GASKET.
What parts can replace 55AC4421?
There are 2 known substitutes for 55AC4421: 20-3504, 301209. Substitute compatibility should be verified for your specific system.
What is the NSN for 55AC4421?
55AC4421 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-297-7246. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026