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53-73203-77 — COVER,ACCESS

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

53-73203-77: COVER,ACCESS.

The COVER,ACCESS is a the manufacturer industrial component. Key specifications include material: STEEL, hole_diameter: 0.191 INCHES MINIMUM AND 0.197 INCHES MAXIMUM IN, surface_treatment: CADMIUM, fsc_application_data: STRUCTURAL ASSEMBLY,AIRFRAME, securing_device_type: TURNLOCK FASTENER, mounting_opening_shape_style: UNTHREADED HOLE. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-876-4301, 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
53-73203-77
NSN: 5340-00-876-4301
FSC: 5340 — Hardware, Commercial
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialSTEEL
hole_diameter0.191 INCHES MINIMUM AND 0.197 INCHES MAXIMUM IN
surface_treatmentCADMIUM
fsc_application_dataSTRUCTURAL ASSEMBLY,AIRFRAME
securing_device_typeTURNLOCK FASTENER
mounting_opening_shape_styleUNTHREADED HOLE
surface_treatment_document_and_classificationQQ-P-416 FED SPEC SINGLE TREATMENT RESPONSE
NSN5340-00-876-4301
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 53-73203-77 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
•
FSC APPLICATION DATA: STRUCTURAL ASSEMBLY,AIRFRAME
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416 FED SPEC SINGLE TREATMENT RESPONSE
•
MOUNTING OPENING SHAPE STYLE: UNTHREADED HOLE
•
SECURING DEVICE TYPE: TURNLOCK FASTENER
•
SURFACE TREATMENT: CADMIUM
•
MATERIAL: STEEL
•
HOLE DIAMETER: 0.191 INCHES MINIMUM AND 0.197 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
FSC APPLICATION DATASTRUCTURAL ASSEMBLY,AIRFRAME
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416 FED SPEC SINGLE TREATMENT RESPONSE
MOUNTING OPENING SHAPE STYLEUNTHREADED HOLE
SECURING DEVICE TYPETURNLOCK FASTENER
SURFACE TREATMENTCADMIUM
MATERIALSTEEL
HOLE DIAMETER0.191 INCHES MINIMUM AND 0.197 INCHES MAXIMUM 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 exhaustedDemilitarization required — critical (Q)
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FREQUENTLY ASKED QUESTIONS
What is 53-73203-77?
53-73203-77 is a COVER,ACCESS.
What is the NSN for 53-73203-77?
53-73203-77 is cataloged in the U.S. Government catalog under NSN 5340-00-876-4301. 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.