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821984 — Technical Data Sheet

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— · 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: RUBBER SYNTHETIC OVERALL, inscription: GEN AND POWER BACK, overall_length: 0.510 INCHES NOMINAL IN, mounting_method: PRESS FIT, effective_length: 0.250 INCHES NOMINAL IN, special_features: CONSTRUCTION: SOLID;CROSS-SECTIONAL WIDTH: 0.099 IN. NOM.

IN. This part is cataloged in the Federal Logistics Information System under NSN 5330-00-618-3376, 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
821984
NSN: 5330-00-618-3376
FSC: 5330
CAGE: 74868 — AMPHENOL CORPORATION DIV AMPHENOL RF (USA)
SPECIFICATIONS
materialRUBBER SYNTHETIC OVERALL
inscriptionGEN AND POWER BACK
overall_length0.510 INCHES NOMINAL IN
mounting_methodPRESS FIT
effective_length0.250 INCHES NOMINAL IN
special_featuresCONSTRUCTION: SOLID;CROSS-SECTIONAL WIDTH: 0.099 IN. NOM. IN
style_designatorFLAT
aperture_diameter0.437 INCHES NOMINAL IN
features_providedREVERSED INSCRIPTION METHOD
surface_conditionSMOOTH FACE
effective_diameter1.125 INCHES NOMINAL IN
fabrication_methodSOLID
NSN5330-00-618-3376
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 821984 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
•
APERTURE DIAMETER: 0.437 INCHES NOMINAL IN
•
FABRICATION METHOD: SOLID
•
CROSS-SECTIONAL HEIGHT: 0.100 INCHES NOMINAL IN
•
MATERIAL: RUBBER SYNTHETIC OVERALL
TECHNICAL CHARACTERISTICS
APERTURE DIAMETER0.437 INCHES NOMINAL IN
FABRICATION METHODSOLID
SPECIAL FEATURESCONSTRUCTION: SOLID;CROSS-SECTIONAL WIDTH: 0.099 IN. NOM. IN
CROSS-SECTIONAL HEIGHT0.100 INCHES NOMINAL IN
MATERIALRUBBER SYNTHETIC OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 24
7478626InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
78F290InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
4610015044InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
82-96InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
UG21CInterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
MILC71InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLEDGOVERNMENT REGISTRY
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 821984?
821984 is a GASKET.
What parts can replace 821984?
There are 24 known substitutes for 821984: 7478626, 78F290, 4610015044 and 21 more. Substitute compatibility should be verified for your specific system.
Is 821984 still available?
821984 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: September 2026