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Technical Data Sheet
PartsTable / COMPONENT / D304821-56
D304821-56 ✓ 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 SEAL,PLAIN is a the manufacturer industrial component. Key specifications include material: RUBBER SYNTHETIC SEALING ELEMENT, seal_width: 0.500 INCHES NOMINAL IN, construction: SOLID, housing_bore_diameter: 5.250 INCHES NOMINAL IN, accommodated_shaft_diameter: 3.500 INCHES NOMINAL IN, cross-sectional_shape_style: SINGLE LIP. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-980-5402, 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
D304821-56
NSN: 5330-00-980-5402
FSC: 5330
CAGE: 3X894 — CONTROL FLOW, INC. DBA CONTROL FLOW INC (USA)
SPECIFICATIONS
materialRUBBER SYNTHETIC SEALING ELEMENT
seal_width0.500 INCHES NOMINAL IN
constructionSOLID
housing_bore_diameter5.250 INCHES NOMINAL IN
accommodated_shaft_diameter3.500 INCHES NOMINAL IN
cross-sectional_shape_styleSINGLE LIP
NSN5330-00-980-5402
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: D304821-56 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
•
MATERIAL: STEEL SPRING
•
CONSTRUCTION: SOLID
•
CROSS-SECTIONAL SHAPE STYLE: SINGLE LIP
•
ACCOMMODATED SHAFT DIAMETER: 3.500 INCHES NOMINAL IN
•
HOUSING BORE DIAMETER: 5.250 INCHES NOMINAL IN
•
SEAL WIDTH: 0.500 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALSTEEL SPRING
CONSTRUCTIONSOLID
CROSS-SECTIONAL SHAPE STYLESINGLE LIP
ACCOMMODATED SHAFT DIAMETER3.500 INCHES NOMINAL IN
HOUSING BORE DIAMETER5.250 INCHES NOMINAL IN
SEAL WIDTH0.500 INCHES NOMINAL IN
MATERIALRUBBER SYNTHETIC SEALING ELEMENT
VERIFIED SUBSTITUTES & CROSS-REFERENCES 23
7268Interchangeable
interchangeable cross-reference
interchangeable
A-A-413Interchangeable
interchangeable cross-reference
interchangeable
GGG-D-296Interchangeable
interchangeable cross-reference
interchangeable
8DATInterchangeable
interchangeable cross-reference
interchangeable
8DAInterchangeable
interchangeable cross-reference
interchangeable
8D8Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is D304821-56?
D304821-56 is a SEAL,PLAIN.
What parts can replace D304821-56?
There are 23 known substitutes for D304821-56: 7268, A-A-413, GGG-D-296 and 20 more. Substitute compatibility should be verified for your specific system.
Is D304821-56 still available?
D304821-56 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