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178C025-1 — COVER,ACCESS

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

178C025-1: COVER,ACCESS.

The COVER,ACCESS is a the manufacturer industrial component. Key specifications include width: 4.218 INCHES NOMINAL IN, length: 5.218 INCHES NOMINAL IN, material: ALUMINUM ALLOY 5052, corner_radius: 0.047 INCHES NOMINAL IN, hole_diameter: 0.136 INCHES NOMINAL IN, body_thickness: 0.063 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-271-3352, 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
178C025-1
NSN: 5340-01-271-3352
FSC: 5340 — Hardware, Commercial
CAGE: 78711 — TELEPHONICS CORP (USA)
SPECIFICATIONS
width4.218 INCHES NOMINAL IN
length5.218 INCHES NOMINAL IN
materialALUMINUM ALLOY 5052
corner_radius0.047 INCHES NOMINAL IN
hole_diameter0.136 INCHES NOMINAL IN
body_thickness0.063 INCHES NOMINAL IN
flange_thickness0.063 INCHES NOMINAL IN
surface_treatmentENAMEL
securing_device_typeSPECIAL
peripheral_shape_styleRECTANGLE, FOUR HOLES
first_recess_inside_height0.187 INCHES NOMINAL IN
cross-sectional_shape_styleRECESS, SAME SHAPE AS THE PERIPHERY
NSN5340-01-271-3352
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 178C025-1 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
•
DISTANCE FROM FIRST HOLE CENTERLINE TO END ALONG WIDTH: 0.484 INCHES NOMINAL IN
•
CORNER RADIUS: 0.047 INCHES NOMINAL IN
•
LENGTH: 5.218 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-E-5558,NO. 513 MIL SPEC SINGLE TREATMENT RESPONSE
•
DISTANCE BETWEEN HOLES ALONG LENGTH: 4.532 INCHES NOMINAL IN
•
FLANGE THICKNESS: 0.063 INCHES NOMINAL IN
•
FIRST RECESS INSIDE HEIGHT: 0.187 INCHES NOMINAL IN
•
DISTANCE BETWEEN HOLES ALONG WIDTH: 3.640 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
DISTANCE FROM FIRST HOLE CENTERLINE TO END ALONG WIDTH0.484 INCHES NOMINAL IN
CORNER RADIUS0.047 INCHES NOMINAL IN
LENGTH5.218 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-E-5558,NO. 513 MIL SPEC SINGLE TREATMENT RESPONSE
DISTANCE BETWEEN HOLES ALONG LENGTH4.532 INCHES NOMINAL IN
FLANGE THICKNESS0.063 INCHES NOMINAL IN
FIRST RECESS INSIDE HEIGHT0.187 INCHES NOMINAL IN
DISTANCE BETWEEN HOLES ALONG WIDTH3.640 INCHES NOMINAL IN
MOUNTING OPENING SHAPE STYLEUNTHREADED HOLE
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-250/8,H32 FED SPEC SINGLE MATERIAL RESPONSE
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: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 178C025-1?
178C025-1 is a COVER,ACCESS.
What is the NSN for 178C025-1?
178C025-1 is cataloged in the U.S. Government catalog under NSN 5340-01-271-3352. 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.