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8420-6-Y — CAP,PROTECTIVE,DUST AND MOISTURE

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

8420-6-Y: CAP,PROTECTIVE,DUST AND MOISTURE.

CAP,PROTECTIVE,DUST AND MOISTURE. Key specifications include material: STEEL, design_type: THREADED, overall_diameter: 4.125 INCHES NOMINAL IN, special_features: BONNET CLAMP, inside_diameter_length: 3.250 INCHES NOMINAL IN, end_item_identification: GLOBE VALVE; NIMITZ CLASS CVN. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-485-3850, 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
8420-6-Y
NSN: 5340-01-485-3850
NIINs: 014853850, 014921861
FSC: 5340 — Hardware, Commercial
CAGE: 63686 — THE WALWORTH COMPANY (USA)
SPECIFICATIONS
materialSTEEL
design_typeTHREADED
overall_diameter4.125 INCHES NOMINAL IN
special_featuresBONNET CLAMP
inside_diameter_length3.250 INCHES NOMINAL IN
end_item_identificationGLOBE VALVE; NIMITZ CLASS CVN
criticality_code_justificationZZZY
reference_number_differentiating_characteristicsMATERIAL WILL BE IN ACCORDANCE WITH NAVICP ACTIVITY HX QUALITY CONTROL, MANUFACTURING AND TESTING SPECIFICATIONS
NSN5340-01-485-3850
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 8420-6-Y 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: 4.125 INCHES NOMINAL IN
•
MATERIAL: STEEL
•
INSIDE DIAMETER LENGTH: 3.250 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
DESIGN TYPETHREADED
OVERALL DIAMETER4.125 INCHES NOMINAL IN
SPECIAL FEATURESBONNET CLAMP
END ITEM IDENTIFICATIONGLOBE VALVE; NIMITZ CLASS CVN
MATERIALSTEEL
INSIDE DIAMETER LENGTH3.250 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

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 8420-6-Y?
8420-6-Y is a CAP,PROTECTIVE,DUST AND MOISTURE.
What is the NSN for 8420-6-Y?
8420-6-Y is cataloged in the U.S. Government catalog under NSN 5340-01-485-3850. 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.