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431976 — COVER,ACCESS

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

431976: COVER,ACCESS.

The COVER,ACCESS is a the manufacturer industrial component. Key specifications include width: 2.420 INCHES MINIMUM AND 2.544 INCHES MAXIMUM IN, length: 2.420 INCHES MINIMUM AND 2.544 INCHES MAXIMUM IN, material: ALUMINUM ALLOY 2024, corner_radius: 0.250 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN, hole_diameter: 0.276 INCHES MINIMUM AND 0.286 INCHES MAXIMUM IN, body_thickness: 0.178 INCHES MINIMUM AND 0.198 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-266-9381, 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
431976
NSN: 5340-01-266-9381
FSC: 5340 — Hardware, Commercial
CAGE: 77445 — RTX CORPORATION DBA PRATT & WHITNEY DIV PRATT &WHITNEY (USA)
SPECIFICATIONS
width2.420 INCHES MINIMUM AND 2.544 INCHES MAXIMUM IN
length2.420 INCHES MINIMUM AND 2.544 INCHES MAXIMUM IN
materialALUMINUM ALLOY 2024
corner_radius0.250 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN
hole_diameter0.276 INCHES MINIMUM AND 0.286 INCHES MAXIMUM IN
body_thickness0.178 INCHES MINIMUM AND 0.198 INCHES MAXIMUM IN
special_featuresPAINT ENCLOSED AREA
surface_treatmentPAINT
securing_device_typeSPECIAL
peripheral_shape_styleRECTANGLE, FOUR HOLES
cross-sectional_shape_styleFLAT
mounting_opening_shape_styleUNTHREADED HOLE
NSN5340-01-266-9381
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 431976 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: 0.250 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN
•
CORNER RADIUS: 0.250 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN
•
LENGTH: 2.420 INCHES MINIMUM AND 2.544 INCHES MAXIMUM IN
•
DISTANCE BETWEEN HOLES ALONG LENGTH: 1.920 INCHES NOMINAL IN
•
DISTANCE BETWEEN HOLES ALONG WIDTH: 1.920 INCHES NOMINAL IN
•
MOUNTING OPENING SHAPE STYLE: UNTHREADED HOLE
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 4037 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 4120 ASSN STD SINGLE MATERIAL RESPONSE
•
CROSS-SECTIONAL SHAPE STYLE: FLAT
TECHNICAL CHARACTERISTICS
DISTANCE FROM FIRST HOLE CENTERLINE TO END ALONG WIDTH0.250 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN
CORNER RADIUS0.250 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN
LENGTH2.420 INCHES MINIMUM AND 2.544 INCHES MAXIMUM IN
DISTANCE BETWEEN HOLES ALONG LENGTH1.920 INCHES NOMINAL IN
DISTANCE BETWEEN HOLES ALONG WIDTH1.920 INCHES NOMINAL IN
MOUNTING OPENING SHAPE STYLEUNTHREADED HOLE
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 4037 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 4120 ASSN STD SINGLE MATERIAL RESPONSE
CROSS-SECTIONAL SHAPE STYLEFLAT
SECURING DEVICE TYPESPECIAL
DISTANCE FROM FIRST HOLE CENTERLINE TO END ALONG LENGTH0.250 INCHES MINIMUM AND 0.312 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 exhaustedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 431976?
431976 is a COVER,ACCESS.
What is the NSN for 431976?
431976 is cataloged in the U.S. Government catalog under NSN 5340-01-266-9381. 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.