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753890 — CAP,PROTECTIVE,DUST AND MOISTURE

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

753890: CAP,PROTECTIVE,DUST AND MOISTURE.

CAP,PROTECTIVE,DUST AND MOISTURE. Key specifications include material: PLASTIC, design_type: THREADED, thread_class: 2B, overall_diameter: 0.813 INCHES NOMINAL IN, inside_diameter_length: 0.625 INCHES NOMINAL IN, round_cap_outside_surface_condition: RIBBED. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-680-4394, 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
753890
NSN: 5340-00-680-4394
FSC: 5340 — Hardware, Commercial
CAGE: 10001 — NAVAIR AND NAVSEA MANAGED ORIGINAL DESIGN ACTIVITY DWG NOT MATERIAL/PARTS SUPPLIER (USA)
SPECIFICATIONS
materialPLASTIC
design_typeTHREADED
thread_class2B
overall_diameter0.813 INCHES NOMINAL IN
inside_diameter_length0.625 INCHES NOMINAL IN
round_cap_outside_surface_conditionRIBBED
thread_size_and_series/type_designator3/4-16 UNF
NSN5340-00-680-4394
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 753890 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: 0.813 INCHES NOMINAL IN
•
THREAD CLASS: 2B
•
MATERIAL: PLASTIC
•
THREAD SIZE AND SERIES/TYPE DESIGNATOR: 3/4-16 UNF
•
INSIDE DIAMETER LENGTH: 0.625 INCHES NOMINAL IN
•
ROUND CAP OUTSIDE SURFACE CONDITION: RIBBED
TECHNICAL CHARACTERISTICS
DESIGN TYPETHREADED
OVERALL DIAMETER0.813 INCHES NOMINAL IN
THREAD CLASS2B
MATERIALPLASTIC
THREAD SIZE AND SERIES/TYPE DESIGNATOR3/4-16 UNF
INSIDE DIAMETER LENGTH0.625 INCHES NOMINAL IN
ROUND CAP OUTSIDE SURFACE CONDITIONRIBBED
SUBSTITUTES & CROSS-REFERENCES 2
CD8Reference document
Same NSN cross-reference
Reference document — Secondary reference
N351CD8Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 753890?
753890 is a CAP,PROTECTIVE,DUST AND MOISTURE.
What parts can replace 753890?
There are 2 known substitutes for 753890: CD8, N351CD8. Substitute compatibility should be verified for your specific system.
What is the NSN for 753890?
753890 is cataloged in the U.S. Government catalog under NSN 5340-00-680-4394. 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.