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663999-3 — GASKET

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

663999-3: GASKET.

The GASKET is a the manufacturer industrial component. Key specifications include material: RUBBER SYNTHETIC OVERALL, overall_width: 9.240 INCHES MINIMUM AND 9.260 INCHES MAXIMUM IN, aperture_width: 8.490 INCHES MINIMUM AND 8.510 INCHES MAXIMUM IN, overall_length: 17.490 INCHES MINIMUM AND 17.510 INCHES MAXIMUM IN, aperture_length: 16.740 INCHES MINIMUM AND 16.760 INCHES MAXIMUM IN, style_designator: NON-CIRCULAR. This part is cataloged in the U.S.

Government catalog under NSN 5330-01-320-3980, 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
663999-3
NSN: 5330-01-320-3980
FSC: 5330 — Packing and Gasket Materials
CAGE: 10001 — NAVAIR AND NAVSEA MANAGED ORIGINAL DESIGN ACTIVITY DWG NOT MATERIAL/PARTS SUPPLIER (USA)
SPECIFICATIONS
materialRUBBER SYNTHETIC OVERALL
overall_width9.240 INCHES MINIMUM AND 9.260 INCHES MAXIMUM IN
aperture_width8.490 INCHES MINIMUM AND 8.510 INCHES MAXIMUM IN
overall_length17.490 INCHES MINIMUM AND 17.510 INCHES MAXIMUM IN
aperture_length16.740 INCHES MINIMUM AND 16.760 INCHES MAXIMUM IN
style_designatorNON-CIRCULAR
inside_corner_radius0.927 INCHES MINIMUM AND 0.947 INCHES MAXIMUM IN
outside_corner_radius1.302 INCHES MINIMUM AND 1.322 INCHES MAXIMUM IN
cross-sectional_thickness0.093 INCHES NOMINAL IN
cross-sectional_shape_styleSOLID SINGLE OR COMPOSITION
material_document_and_classificationGR SB 715,CAGEC 97993 MFR REF SINGLE MATERIAL RESPONSE OVERALL
outside_edge_to_inside_edge_smallest_distance_along_width0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN
NSN5330-01-320-3980
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 663999-3 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 THICKNESS: 0.093 INCHES NOMINAL IN
•
INSIDE CORNER RADIUS: 0.927 INCHES MINIMUM AND 0.947 INCHES MAXIMUM IN
•
OUTSIDE EDGE TO INSIDE EDGE SMALLEST DISTANCE ALONG WIDTH: 0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: NON-CIRCULAR
•
MATERIAL DOCUMENT AND CLASSIFICATION: GR SB 715,CAGEC 97993 MFR REF SINGLE MATERIAL RESPONSE OVERALL
•
CROSS-SECTIONAL SHAPE STYLE: SOLID SINGLE OR COMPOSITION
TECHNICAL CHARACTERISTICS
CROSS-SECTIONAL THICKNESS0.093 INCHES NOMINAL IN
INSIDE CORNER RADIUS0.927 INCHES MINIMUM AND 0.947 INCHES MAXIMUM IN
OUTSIDE EDGE TO INSIDE EDGE SMALLEST DISTANCE ALONG WIDTH0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN
STYLE DESIGNATORNON-CIRCULAR
MATERIAL DOCUMENT AND CLASSIFICATIONGR SB 715,CAGEC 97993 MFR REF SINGLE MATERIAL RESPONSE OVERALL
OVERALL LENGTH17.490 INCHES MINIMUM AND 17.510 INCHES MAXIMUM IN
CROSS-SECTIONAL SHAPE STYLESOLID SINGLE OR COMPOSITION
OVERALL WIDTH9.240 INCHES MINIMUM AND 9.260 INCHES MAXIMUM IN
APERTURE WIDTH8.490 INCHES MINIMUM AND 8.510 INCHES MAXIMUM IN
APERTURE LENGTH16.740 INCHES MINIMUM AND 16.760 INCHES MAXIMUM IN
OTHER ITEMS IN FSC 5330 — Packing and Gasket Materials
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5330-00-000-0085 5330-00-000-0167 5330-00-000-5275 5330-00-001-1260 5330-00-001-1833 5330-00-001-1844 5330-00-001-1845 5330-00-001-1846
SUBSTITUTES & CROSS-REFERENCES 1
T-8382676-3Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 663999-3?
663999-3 is a GASKET.
What parts can replace 663999-3?
There is 1 known substitute for 663999-3: T-8382676-3. Substitute compatibility should be verified for your specific system.
What is the NSN for 663999-3?
663999-3 is cataloged in the U.S. Government catalog under NSN 5330-01-320-3980. 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.