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KEC1663 — CAP,PROTECTIVE,DUST AND MOISTURE

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

KEC1663: CAP,PROTECTIVE,DUST AND MOISTURE.

CAP,PROTECTIVE,DUST AND MOISTURE. Key specifications include material: ALUMINUM ALLOY, design_type: THREADED, thread_class: 2B, surface_treatment: ENAMEL, width_across_flats: 0.431 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN, inside_diameter_length: 0.220 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-497-3267, 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
KEC1663
NSN: 5340-00-497-3267
FSC: 5340 — Hardware, Commercial
CAGE: K0802 — MEGGITT (UK) LTD DIV MEGGITT SENSING SYSTEMS (GBR)
SPECIFICATIONS
materialALUMINUM ALLOY
design_typeTHREADED
thread_class2B
surface_treatmentENAMEL
width_across_flats0.431 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN
inside_diameter_length0.220 INCHES NOMINAL IN
thread_size_and_series/type_designator5/16-32 UN
NSN5340-00-497-3267
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: KEC1663 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: 0.431 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN
•
DESIGN TYPE: THREADED
•
SURFACE TREATMENT: ENAMEL
•
THREAD CLASS: 2B
•
MATERIAL: ALUMINUM ALLOY
•
THREAD SIZE AND SERIES/TYPE DESIGNATOR: 5/16-32 UN
•
INSIDE DIAMETER LENGTH: 0.220 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.431 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN
DESIGN TYPETHREADED
SURFACE TREATMENTENAMEL
THREAD CLASS2B
MATERIALALUMINUM ALLOY
THREAD SIZE AND SERIES/TYPE DESIGNATOR5/16-32 UN
INSIDE DIAMETER LENGTH0.220 INCHES NOMINAL IN
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: Terminal item — no further procurement; issued until stock is exhaustedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is KEC1663?
KEC1663 is a CAP,PROTECTIVE,DUST AND MOISTURE.
What is the NSN for KEC1663?
KEC1663 is cataloged in the U.S. Government catalog under NSN 5340-00-497-3267. 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.