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5959304-56 — COVER,ACCESS

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

5959304-56: COVER,ACCESS.

The COVER,ACCESS is a the manufacturer industrial component. Key specifications include width: 5.500 INCHES NOMINAL IN, length: 12.000 INCHES NOMINAL IN, material: NICKEL ALLOY, corner_radius: 0.380 INCHES NOMINAL IN, hole_diameter: 0.406 INCHES NOMINAL IN, body_thickness: 0.125 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-334-3752, 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
5959304-56
NSN: 5340-01-334-3752
FSC: 5340 — Hardware, Commercial
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
width5.500 INCHES NOMINAL IN
length12.000 INCHES NOMINAL IN
materialNICKEL ALLOY
corner_radius0.380 INCHES NOMINAL IN
hole_diameter0.406 INCHES NOMINAL IN
body_thickness0.125 INCHES NOMINAL IN
securing_device_typeSPECIAL
peripheral_shape_styleRECTANGLE, MULTI HOLES
hole_quantity_along_width4
hole_quantity_along_length6
cross-sectional_shape_styleFLAT
mounting_opening_shape_styleUNTHREADED HOLE
NSN5340-01-334-3752
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 5959304-56 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: 0.380 INCHES NOMINAL IN
•
CORNER RADIUS: 0.380 INCHES NOMINAL IN
•
LENGTH: 12.000 INCHES NOMINAL IN
•
DISTANCE BETWEEN HOLES ALONG LENGTH: 2.812 INCHES NOMINAL IN
•
HOLE QUANTITY ALONG LENGTH: 6
•
DISTANCE BETWEEN HOLES ALONG WIDTH: 2.750 INCHES NOMINAL IN
•
MOUNTING OPENING SHAPE STYLE: UNTHREADED HOLE
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-N-281,CLASS A,ALLOY 400 FED SPEC SINGLE MATERIAL RESPONSE
TECHNICAL CHARACTERISTICS
DISTANCE FROM FIRST HOLE CENTERLINE TO END ALONG WIDTH0.380 INCHES NOMINAL IN
CORNER RADIUS0.380 INCHES NOMINAL IN
LENGTH12.000 INCHES NOMINAL IN
DISTANCE BETWEEN HOLES ALONG LENGTH2.812 INCHES NOMINAL IN
HOLE QUANTITY ALONG LENGTH6
DISTANCE BETWEEN HOLES ALONG WIDTH2.750 INCHES NOMINAL IN
MOUNTING OPENING SHAPE STYLEUNTHREADED HOLE
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-N-281,CLASS A,ALLOY 400 FED SPEC SINGLE MATERIAL RESPONSE
CROSS-SECTIONAL SHAPE STYLEFLAT
SECURING DEVICE TYPESPECIAL
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 1
256-6603687-VHBM-66Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 5959304-56?
5959304-56 is a COVER,ACCESS.
What parts can replace 5959304-56?
There is 1 known substitute for 5959304-56: 256-6603687-VHBM-66. Substitute compatibility should be verified for your specific system.
What is the NSN for 5959304-56?
5959304-56 is cataloged in the U.S. Government catalog under NSN 5340-01-334-3752. 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.