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D18D21 — CAP ASSEMBLY,DUCT

✓ Government record, cited
— · COMPONENT
PRODUCT OVERVIEW

D18D21: CAP ASSEMBLY,DUCT.

The CAP ASSEMBLY,DUCT is a the manufacturer industrial component. Key specifications include end_item_identification: MC-DONNELL DOUGLAS MODEL DC-9 AIRPLANE, general_characteristics_item_description: BOWL SHAPED ALUMINUM,1.625 INCH HIGH X 4.125 INCH DIA IN. This part is cataloged in the U.S.

Government catalog under NSN 5342-00-442-0609, 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
D18D21
NSN: 5342-00-442-0609
FSC: 5342 — Hardware, Weapon System
CAGE: 72914 — GRIMES AEROSPACE COMPANY (USA)
SPECIFICATIONS
end_item_identificationMC-DONNELL DOUGLAS MODEL DC-9 AIRPLANE
general_characteristics_item_descriptionBOWL SHAPED ALUMINUM,1.625 INCH HIGH X 4.125 INCH DIA IN
NSN5342-00-442-0609
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available CAP ASSEMBLY,DUCT TITLE COMPONENT PN D18D21 MFR CAP ASSEMBLY,DUCT
KEY FEATURES
•
GENERAL CHARACTERISTICS ITEM DESCRIPTION: BOWL SHAPED ALUMINUM,1.625 INCH HIGH X 4.125 INCH DIA IN
TECHNICAL CHARACTERISTICS
GENERAL CHARACTERISTICS ITEM DESCRIPTIONBOWL SHAPED ALUMINUM,1.625 INCH HIGH X 4.125 INCH DIA IN
END ITEM IDENTIFICATIONMC-DONNELL DOUGLAS MODEL DC-9 AIRPLANE
OTHER ITEMS IN FSC 5342 — Hardware, Weapon System
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5342-00-001-1696 5342-00-001-1972 5342-00-001-1980 5342-00-001-2492 5342-00-001-2502 5342-00-001-3915 5342-00-001-4001 5342-00-001-4655
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 D18D21?
D18D21 is a CAP ASSEMBLY,DUCT.
What is the NSN for D18D21?
D18D21 is cataloged in the U.S. Government catalog under NSN 5342-00-442-0609. 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.