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U6478 — CAP,PROTECTIVE,DUST AND MOISTURE

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

U6478: CAP,PROTECTIVE,DUST AND MOISTURE.

CAP,PROTECTIVE,DUST AND MOISTURE. Key specifications include material: ALUMINUM ALLOY, design_type: THREADED, thread_class: 2A A, overall_diameter: 1.976 INCHES MINIMUM AND 2.072 INCHES MAXIMUM IN, surface_treatment: ANODIZE, width_across_flats: 2.380 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-456-2575, 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
U6478
NSN: 5340-00-456-2575
FSC: 5340 — Hardware, Commercial
CAGE: 99551 — GOODRICH CORPORATION DBA GOODRICH CORP (USA)
SPECIFICATIONS
materialALUMINUM ALLOY
design_typeTHREADED
thread_class2A A
overall_diameter1.976 INCHES MINIMUM AND 2.072 INCHES MAXIMUM IN
surface_treatmentANODIZE
width_across_flats2.380 INCHES NOMINAL IN
round_cap_outside_surface_conditionSERRATED
material_document_and_classificationQQ-A-BAQQ-A-225/5, ALLOY 2017, T4 FED SPEC SINGLE MATERIAL RESPONSE
thread_size_and_series/type_designator1-7/8-12 UNIFIED NATIONAL COARSE (UNC)
NSN5340-00-456-2575
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: U6478 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
•
WIDTH ACROSS FLATS: 2.380 INCHES NOMINAL IN
•
DESIGN TYPE: THREADED
•
OVERALL DIAMETER: 1.976 INCHES MINIMUM AND 2.072 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-A-BAQQ-A-225/5, ALLOY 2017, T4 FED SPEC SINGLE MATERIAL RESPONSE
•
SURFACE TREATMENT: ANODIZE
•
THREAD CLASS: 2A A
•
MATERIAL: ALUMINUM ALLOY
•
THREAD SIZE AND SERIES/TYPE DESIGNATOR: 1-7/8-12 UNIFIED NATIONAL COARSE (UNC)
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS2.380 INCHES NOMINAL IN
DESIGN TYPETHREADED
OVERALL DIAMETER1.976 INCHES MINIMUM AND 2.072 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-BAQQ-A-225/5, ALLOY 2017, T4 FED SPEC SINGLE MATERIAL RESPONSE
SURFACE TREATMENTANODIZE
THREAD CLASS2A A
MATERIALALUMINUM ALLOY
THREAD SIZE AND SERIES/TYPE DESIGNATOR1-7/8-12 UNIFIED NATIONAL COARSE (UNC)
ROUND CAP OUTSIDE SURFACE CONDITIONSERRATED
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

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 U6478?
U6478 is a CAP,PROTECTIVE,DUST AND MOISTURE.
What is the NSN for U6478?
U6478 is cataloged in the U.S. Government catalog under NSN 5340-00-456-2575. 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.