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21040421 — COVER,AIRCRAFT GROUND SERVICING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

21040421: COVER,AIRCRAFT GROUND SERVICING.

COVER,AIRCRAFT GROUND SERVICING. Key specifications include part_name_assigned_by_controlling_agency: COVER, MOUNT. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-860-1343, 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
21040421
NSN: 5340-00-860-1343
NIINs: 008601343, 016917407
FSC: 5340 — Hardware, Commercial
CAGE: 79U29 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
part_name_assigned_by_controlling_agencyCOVER, MOUNT
NSN5340-00-860-1343
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 21040421 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
•
SECURING DEVICE TYPE: TURNLOCK FASTENER
•
MATERIAL: ALUMINUM ALLOY
TECHNICAL CHARACTERISTICS
SECURING DEVICE TYPETURNLOCK FASTENER
MATERIALALUMINUM ALLOY
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandDemilitarization required — critical (Q)
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FREQUENTLY ASKED QUESTIONS
What is 21040421?
21040421 is a COVER,AIRCRAFT GROUND SERVICING.
What is the NSN for 21040421?
21040421 is cataloged in the U.S. Government catalog under NSN 5340-00-860-1343. 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.