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6521-70-820-3043 — COVER,ACCESS

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

6521-70-820-3043: COVER,ACCESS.

The COVER,ACCESS is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY 7075, end_item_identification: AIRCRAFT MODEL MH-53E, material_document_and_classification: QQ-A-250/18 FED SPEC SINGLE MATERIAL RESPONSE, part_name_assigned_by_controlling_agency: COVER, RACE TRACK ACCESS AMCM SPONSON. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-306-0835, 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
6521-70-820-3043
NSN: 5340-01-306-0835
FSC: 5340 — Hardware, Commercial
CAGE: 78286 — SIKORSKY AIRCRAFT CORPORATION DBA SIKORSKY AIRCRAFT CORP (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 7075
end_item_identificationAIRCRAFT MODEL MH-53E
material_document_and_classificationQQ-A-250/18 FED SPEC SINGLE MATERIAL RESPONSE
part_name_assigned_by_controlling_agencyCOVER, RACE TRACK ACCESS AMCM SPONSON
NSN5340-01-306-0835
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 6521-70-820-3043 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
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-A-250/18 FED SPEC SINGLE MATERIAL RESPONSE
•
MATERIAL: ALUMINUM ALLOY 7075
TECHNICAL CHARACTERISTICS
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-250/18 FED SPEC SINGLE MATERIAL RESPONSE
PART NAME ASSIGNED BY CONTROLLING AGENCYCOVER, RACE TRACK ACCESS AMCM SPONSON
END ITEM IDENTIFICATIONAIRCRAFT MODEL MH-53E
MATERIALALUMINUM ALLOY 7075
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 1
65217-08203-047Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 6521-70-820-3043?
6521-70-820-3043 is a COVER,ACCESS.
What parts can replace 6521-70-820-3043?
There is 1 known substitute for 6521-70-820-3043: 65217-08203-047. Substitute compatibility should be verified for your specific system.
What is the NSN for 6521-70-820-3043?
6521-70-820-3043 is cataloged in the U.S. Government catalog under NSN 5340-01-306-0835. 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.