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1979974 — COVER,ACCESS

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

1979974: COVER,ACCESS.

The COVER,ACCESS is a the manufacturer industrial component. Key specifications include width: 6.250 INCHES NOMINAL IN, length: 7.120 INCHES NOMINAL IN, material: ALUMINUM, peripheral_shape_style: RECTANGLE, FOUR HOLES, distance_between_holes_along_width: 2.812 INCHES NOMINAL IN, distance_between_holes_along_length: 2.750 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-390-2849, 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
1979974
NSN: 5340-01-390-2849
FSC: 5340 — Hardware, Commercial
CAGE: 03956 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
width6.250 INCHES NOMINAL IN
length7.120 INCHES NOMINAL IN
materialALUMINUM
peripheral_shape_styleRECTANGLE, FOUR HOLES
distance_between_holes_along_width2.812 INCHES NOMINAL IN
distance_between_holes_along_length2.750 INCHES NOMINAL IN
material_document_and_classificationQQ-A-250/8, 5052-H32 FED SPEC SINGLE MATERIAL RESPONSE
distance_from_first_hole_centerline_to_end_along_length2.750 INCHES NOMINAL IN
NSN5340-01-390-2849
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 1979974 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
•
LENGTH: 7.120 INCHES NOMINAL IN
•
DISTANCE BETWEEN HOLES ALONG LENGTH: 2.750 INCHES NOMINAL IN
•
DISTANCE BETWEEN HOLES ALONG WIDTH: 2.812 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-A-250/8, 5052-H32 FED SPEC SINGLE MATERIAL RESPONSE
•
DISTANCE FROM FIRST HOLE CENTERLINE TO END ALONG LENGTH: 2.750 INCHES NOMINAL IN
•
PERIPHERAL SHAPE STYLE: RECTANGLE, FOUR HOLES
•
WIDTH: 6.250 INCHES NOMINAL IN
•
MATERIAL: ALUMINUM
TECHNICAL CHARACTERISTICS
LENGTH7.120 INCHES NOMINAL IN
DISTANCE BETWEEN HOLES ALONG LENGTH2.750 INCHES NOMINAL IN
DISTANCE BETWEEN HOLES ALONG WIDTH2.812 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-250/8, 5052-H32 FED SPEC SINGLE MATERIAL RESPONSE
DISTANCE FROM FIRST HOLE CENTERLINE TO END ALONG LENGTH2.750 INCHES NOMINAL IN
PERIPHERAL SHAPE STYLERECTANGLE, FOUR HOLES
WIDTH6.250 INCHES NOMINAL IN
MATERIALALUMINUM
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)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 1979974?
1979974 is a COVER,ACCESS.
What is the NSN for 1979974?
1979974 is cataloged in the U.S. Government catalog under NSN 5340-01-390-2849. 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.