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555-6405456-9902 — CAP,PROTECTIVE,DUST AND MOISTURE

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

555-6405456-9902: CAP,PROTECTIVE,DUST AND MOISTURE.

CAP,PROTECTIVE,DUST AND MOISTURE. Key specifications include material: COPPER ALLOY, design_type: THREADED, overall_diameter: 3.000 INCHES NOMINAL IN, special_features: MATERIAL IS ALLOY C71500, MIL-C-24679; HEIGHT IS 1.25 INCHES INCLUDING QUARTER INCH KNOB ON TOP IN, inside_diameter_length: 2.060 INCHES NOMINAL IN, end_item_identification: VIRGINIA CLASS SSN; MISC POTABLES. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-512-0423, 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
555-6405456-9902
NSN: 5340-01-512-0423
FSC: 5340 — Hardware, Commercial
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
materialCOPPER ALLOY
design_typeTHREADED
overall_diameter3.000 INCHES NOMINAL IN
special_featuresMATERIAL IS ALLOY C71500, MIL-C-24679; HEIGHT IS 1.25 INCHES INCLUDING QUARTER INCH KNOB ON TOP IN
inside_diameter_length2.060 INCHES NOMINAL IN
end_item_identificationVIRGINIA CLASS SSN; MISC POTABLES
round_cap_outside_surface_conditionRIBBED
thread_size_and_series/type_designator1.50-11.50 NPSH
NSN5340-01-512-0423
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 555-6405456-9902 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
•
DESIGN TYPE: THREADED
•
OVERALL DIAMETER: 3.000 INCHES NOMINAL IN
•
MATERIAL: COPPER ALLOY
•
THREAD SIZE AND SERIES/TYPE DESIGNATOR: 1.50-11.50 NPSH
•
INSIDE DIAMETER LENGTH: 2.060 INCHES NOMINAL IN
•
ROUND CAP OUTSIDE SURFACE CONDITION: RIBBED
TECHNICAL CHARACTERISTICS
DESIGN TYPETHREADED
OVERALL DIAMETER3.000 INCHES NOMINAL IN
SPECIAL FEATURESMATERIAL IS ALLOY C71500, MIL-C-24679; HEIGHT IS 1.25 INCHES INCLUDING QUARTER INCH KNOB ON TOP IN
END ITEM IDENTIFICATIONVIRGINIA CLASS SSN; MISC POTABLES
MATERIALCOPPER ALLOY
THREAD SIZE AND SERIES/TYPE DESIGNATOR1.50-11.50 NPSH
INSIDE DIAMETER LENGTH2.060 INCHES NOMINAL IN
ROUND CAP OUTSIDE SURFACE CONDITIONRIBBED
OTHER ITEMS IN FSC 5340 — Hardware, Commercial
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5340-00-000-0068 5340-00-000-0132 5340-00-000-8150 5340-00-001-1251 5340-00-001-1264 5340-00-001-1265 5340-00-001-1266 5340-00-001-1275
SUBSTITUTES & CROSS-REFERENCES 1
DF2402-701-9902Same 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 555-6405456-9902?
555-6405456-9902 is a CAP,PROTECTIVE,DUST AND MOISTURE.
What parts can replace 555-6405456-9902?
There is 1 known substitute for 555-6405456-9902: DF2402-701-9902. Substitute compatibility should be verified for your specific system.
What is the NSN for 555-6405456-9902?
555-6405456-9902 is cataloged in the U.S. Government catalog under NSN 5340-01-512-0423. 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.