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3866K557 — COVER,ACCESS

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

3866K557: COVER,ACCESS.

The COVER,ACCESS is a the manufacturer industrial component. Key specifications include width: 5.785 INCHES NOMINAL IN, length: 11.500 INCHES NOMINAL IN, inside_width: 4.375 INCHES NOMINAL IN, corner_radius: 1.125 INCHES NOMINAL IN, hole_diameter: 0.412 INCHES NOMINAL IN, inside_length: 10.000 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-734-6820, 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
3866K557
NSN: 5340-00-734-6820
FSC: 5340 — Hardware, Commercial
CAGE: 78500 — MERITOR HEAVY VEHICLE SYSTEMS, LLC (USA)
SPECIFICATIONS
width5.785 INCHES NOMINAL IN
length11.500 INCHES NOMINAL IN
inside_width4.375 INCHES NOMINAL IN
corner_radius1.125 INCHES NOMINAL IN
hole_diameter0.412 INCHES NOMINAL IN
inside_length10.000 INCHES NOMINAL IN
body_thickness0.179 INCHES NOMINAL IN
flange_thickness0.179 INCHES NOMINAL IN
inside_corner_radius0.190 INCHES NOMINAL IN
securing_device_typeTHREADED FASTENER
peripheral_shape_styleRECTANGLE, MULTI HOLES
hole_quantity_along_width6
NSN5340-00-734-6820
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 3866K557 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: 2.940 INCHES NOMINAL IN
•
INSIDE WIDTH: 4.375 INCHES NOMINAL IN
•
CORNER RADIUS: 1.125 INCHES NOMINAL IN
•
LENGTH: 11.500 INCHES NOMINAL IN
•
INSIDE LENGTH: 10.000 INCHES NOMINAL IN
•
DISTANCE BETWEEN HOLES ALONG LENGTH: 3.500 INCHES NOMINAL IN
•
FLANGE THICKNESS: 0.179 INCHES NOMINAL IN
•
INSIDE CORNER RADIUS: 0.190 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
DISTANCE FROM FIRST HOLE CENTERLINE TO END ALONG WIDTH2.940 INCHES NOMINAL IN
INSIDE WIDTH4.375 INCHES NOMINAL IN
CORNER RADIUS1.125 INCHES NOMINAL IN
LENGTH11.500 INCHES NOMINAL IN
INSIDE LENGTH10.000 INCHES NOMINAL IN
DISTANCE BETWEEN HOLES ALONG LENGTH3.500 INCHES NOMINAL IN
FLANGE THICKNESS0.179 INCHES NOMINAL IN
INSIDE CORNER RADIUS0.190 INCHES NOMINAL IN
FIRST RECESS INSIDE HEIGHT0.446 INCHES NOMINAL IN
HOLE QUANTITY ALONG LENGTH4
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 3
98666R1Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
2520007346820Reference document
Same NSN cross-reference
Reference document — Secondary reference
K05284Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 3866K557?
3866K557 is a COVER,ACCESS.
What parts can replace 3866K557?
There are 3 known substitutes for 3866K557: 98666R1, 2520007346820, K05284. Substitute compatibility should be verified for your specific system.
What is the NSN for 3866K557?
3866K557 is cataloged in the U.S. Government catalog under NSN 5340-00-734-6820. 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.