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3866E525 — COVER,ACCESS

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

3866E525: COVER,ACCESS.

The COVER,ACCESS is a the manufacturer industrial component. Key specifications include width: 4.313 INCHES NOMINAL IN, length: 5.125 INCHES NOMINAL IN, material: IRON CAST, ear_radius: 0.469 INCHES NOMINAL IN, body_radius: 2.563 INCHES NOMINAL IN, body_thickness: 0.250 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-752-1439, 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
3866E525
NSN: 5340-00-752-1439
FSC: 5340 — Hardware, Commercial
CAGE: 78500 — MERITOR HEAVY VEHICLE SYSTEMS, LLC (USA)
SPECIFICATIONS
width4.313 INCHES NOMINAL IN
length5.125 INCHES NOMINAL IN
materialIRON CAST
ear_radius0.469 INCHES NOMINAL IN
body_radius2.563 INCHES NOMINAL IN
body_thickness0.250 INCHES NOMINAL IN
inside_diameter3.375 INCHES NOMINAL IN
flange_thickness0.438 INCHES NOMINAL IN
special_featuresUNEQUALLY SPACED HOLES
fsc_application_dataTRANSFER TRANSMISSION,TRUCK
inside_corner_radius2.500 INCHES NOMINAL IN
securing_device_typeTHREADED FASTENER
NSN5340-00-752-1439
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 3866E525 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: 0.625 INCHES NOMINAL IN
•
FSC APPLICATION DATA: TRANSFER TRANSMISSION,TRUCK
•
LENGTH: 5.125 INCHES NOMINAL IN
•
DISTANCE BETWEEN HOLES ALONG LENGTH: 3.688 INCHES NOMINAL IN
•
FLANGE THICKNESS: 0.438 INCHES NOMINAL IN
•
BOLT CIRCLE HOLE QUANTITY: 4
•
INSIDE CORNER RADIUS: 2.500 INCHES NOMINAL IN
•
FIRST RECESS INSIDE HEIGHT: 1.125 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
DISTANCE FROM FIRST HOLE CENTERLINE TO END ALONG WIDTH0.625 INCHES NOMINAL IN
FSC APPLICATION DATATRANSFER TRANSMISSION,TRUCK
LENGTH5.125 INCHES NOMINAL IN
DISTANCE BETWEEN HOLES ALONG LENGTH3.688 INCHES NOMINAL IN
FLANGE THICKNESS0.438 INCHES NOMINAL IN
BOLT CIRCLE HOLE QUANTITY4
INSIDE CORNER RADIUS2.500 INCHES NOMINAL IN
FIRST RECESS INSIDE HEIGHT1.125 INCHES NOMINAL IN
EAR RADIUS0.469 INCHES NOMINAL IN
MOUNTING OPENING SHAPE STYLEUNTHREADED HOLE
SUBSTITUTES & CROSS-REFERENCES 3
706T5Reference document
Same NSN cross-reference
Reference document — Secondary reference
913659Reference document
Same NSN cross-reference
Reference document — Secondary reference
2520007521439Reference document
Same NSN cross-reference
Reference document — Informative reference only
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 3866E525?
3866E525 is a COVER,ACCESS.
What parts can replace 3866E525?
There are 3 known substitutes for 3866E525: 706T5, 913659, 2520007521439. Substitute compatibility should be verified for your specific system.
What is the NSN for 3866E525?
3866E525 is cataloged in the U.S. Government catalog under NSN 5340-00-752-1439. 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.