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AD31251-1 — COVER,ACCESS

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

AD31251-1: COVER,ACCESS.

The COVER,ACCESS is a the manufacturer industrial component. Key specifications include width: 6.500 INCHES NOMINAL IN, length: 6.500 INCHES NOMINAL IN, material: ALUMINUM ALLOY 2024, corner_radius: 0.750 INCHES NOMINAL IN, hole_diameter: 0.312 INCHES MINIMUM AND 0.322 INCHES MAXIMUM IN, body_thickness: 0.063 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-031-3251, 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
AD31251-1
NSN: 5340-01-031-3251
FSC: 5340 — Hardware, Commercial
CAGE: 73030 — HAMILTON SUNDSTRAND CORPORATION DBA COLLINS AEROSPACE (USA)
SPECIFICATIONS
width6.500 INCHES NOMINAL IN
length6.500 INCHES NOMINAL IN
materialALUMINUM ALLOY 2024
corner_radius0.750 INCHES NOMINAL IN
hole_diameter0.312 INCHES MINIMUM AND 0.322 INCHES MAXIMUM IN
body_thickness0.063 INCHES NOMINAL IN
surface_treatmentANODIZE
inside_corner_radius14.900 INCHES NOMINAL IN
securing_device_typeTHREADED FASTENER
peripheral_shape_styleRECTANGLE, FOUR HOLES
cross-sectional_shape_styleARCHED
mounting_opening_shape_styleUNTHREADED HOLE
NSN5340-01-031-3251
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: AD31251-1 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: 0.750 INCHES NOMINAL IN
•
CORNER RADIUS: 0.750 INCHES NOMINAL IN
•
LENGTH: 6.500 INCHES NOMINAL IN
•
DISTANCE BETWEEN HOLES ALONG LENGTH: 5.000 INCHES NOMINAL IN
•
INSIDE CORNER RADIUS: 14.900 INCHES NOMINAL IN
•
DISTANCE BETWEEN HOLES ALONG WIDTH: 5.000 INCHES NOMINAL IN
•
MOUNTING OPENING SHAPE STYLE: UNTHREADED HOLE
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 4040 ALLOY 2024 TEMP O ASSN STD SINGLE MATERIAL RESPONSE
TECHNICAL CHARACTERISTICS
DISTANCE FROM FIRST HOLE CENTERLINE TO END ALONG WIDTH0.750 INCHES NOMINAL IN
CORNER RADIUS0.750 INCHES NOMINAL IN
LENGTH6.500 INCHES NOMINAL IN
DISTANCE BETWEEN HOLES ALONG LENGTH5.000 INCHES NOMINAL IN
INSIDE CORNER RADIUS14.900 INCHES NOMINAL IN
DISTANCE BETWEEN HOLES ALONG WIDTH5.000 INCHES NOMINAL IN
MOUNTING OPENING SHAPE STYLEUNTHREADED HOLE
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 4040 ALLOY 2024 TEMP O ASSN STD SINGLE MATERIAL RESPONSE
CROSS-SECTIONAL SHAPE STYLEARCHED
SECURING DEVICE TYPETHREADED FASTENER
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)Demilitarization required — critical (Q)
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FREQUENTLY ASKED QUESTIONS
What is AD31251-1?
AD31251-1 is a COVER,ACCESS.
What is the NSN for AD31251-1?
AD31251-1 is cataloged in the U.S. Government catalog under NSN 5340-01-031-3251. 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.