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256911PC4 — SEAL,NONMETALLIC SPECIAL SHAPED

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

256911PC4: SEAL,NONMETALLIC SPECIAL SHAPED.

SEAL,NONMETALLIC SPECIAL SHAPED. Key specifications include material: COPPER ALLOY SPRING, construction: SOLID, overall_length: 54.000 INCHES NOMINAL IN, fabrication_method: SOLID, cross-sectional_width: 0.390 INCHES NOMINAL IN, cross-sectional_height: 0.793 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5330-00-384-3876, 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
256911PC4
NSN: 5330-00-384-3876
FSC: 5330 — Packing and Gasket Materials
CAGE: 10001 — NAVAIR AND NAVSEA MANAGED ORIGINAL DESIGN ACTIVITY DWG NOT MATERIAL/PARTS SUPPLIER (USA)
SPECIFICATIONS
materialCOPPER ALLOY SPRING
constructionSOLID
overall_length54.000 INCHES NOMINAL IN
fabrication_methodSOLID
cross-sectional_width0.390 INCHES NOMINAL IN
cross-sectional_height0.793 INCHES NOMINAL IN
NSN5330-00-384-3876
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 256911PC4 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 HEIGHT: 0.793 INCHES NOMINAL IN
•
CROSS-SECTIONAL WIDTH: 0.390 INCHES NOMINAL IN
•
MATERIAL: RUBBER OVERALL
•
FABRICATION METHOD: SOLID
•
CONSTRUCTION: SOLID
TECHNICAL CHARACTERISTICS
CROSS-SECTIONAL HEIGHT0.793 INCHES NOMINAL IN
CROSS-SECTIONAL WIDTH0.390 INCHES NOMINAL IN
OVERALL LENGTH54.000 INCHES NOMINAL IN
MATERIALRUBBER OVERALL
MATERIALCOPPER ALLOY SPRING
FABRICATION METHODSOLID
CONSTRUCTIONSOLID
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

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Terminal item — stock exhausted; no further procurementNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 256911PC4?
256911PC4 is a SEAL,NONMETALLIC SPECIAL SHAPED.
What is the NSN for 256911PC4?
256911PC4 is cataloged in the U.S. Government catalog under NSN 5330-00-384-3876. 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.