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1979981 — COVER,ACCESS

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

1979981: COVER,ACCESS.

The COVER,ACCESS is a the manufacturer industrial component. Key specifications include width: 10.370 INCHES NOMINAL IN, length: 33.310 INCHES NOMINAL IN, material: STEEL, inside_width: 8.120 INCHES NOMINAL IN, corner_radius: 0.620 INCHES NOMINAL IN, hole_diameter: 0.251 INCHES MINIMUM AND 0.258 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-406-9190, 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
1979981
NSN: 5340-01-406-9190
FSC: 5340 — Hardware, Commercial
CAGE: 03956 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
width10.370 INCHES NOMINAL IN
length33.310 INCHES NOMINAL IN
materialSTEEL
inside_width8.120 INCHES NOMINAL IN
corner_radius0.620 INCHES NOMINAL IN
hole_diameter0.251 INCHES MINIMUM AND 0.258 INCHES MAXIMUM IN
inside_length32.012 INCHES NOMINAL IN
body_thickness0.059 INCHES NOMINAL IN
flange_thickness0.059 INCHES NOMINAL IN
surface_treatmentENAMEL SEMIGLOSS
securing_device_typeSPECIAL
peripheral_shape_styleRECTANGLE, MULTI HOLES
NSN5340-01-406-9190
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 1979981 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
•
INSIDE WIDTH: 8.120 INCHES NOMINAL IN
•
CORNER RADIUS: 0.620 INCHES NOMINAL IN
•
LENGTH: 33.310 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-E-15090 TY 2 CL 2 MIL SPEC SINGLE TREATMENT RESPONSE
•
INSIDE LENGTH: 32.012 INCHES NOMINAL IN
•
DISTANCE BETWEEN HOLES ALONG LENGTH: 4.000 INCHES NOMINAL IN
•
FLANGE THICKNESS: 0.059 INCHES NOMINAL IN
•
FIRST RECESS INSIDE HEIGHT: 2.191 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
INSIDE WIDTH8.120 INCHES NOMINAL IN
CORNER RADIUS0.620 INCHES NOMINAL IN
LENGTH33.310 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-E-15090 TY 2 CL 2 MIL SPEC SINGLE TREATMENT RESPONSE
INSIDE LENGTH32.012 INCHES NOMINAL IN
DISTANCE BETWEEN HOLES ALONG LENGTH4.000 INCHES NOMINAL IN
FLANGE THICKNESS0.059 INCHES NOMINAL IN
FIRST RECESS INSIDE HEIGHT2.191 INCHES NOMINAL IN
HOLE QUANTITY ALONG LENGTH18
MOUNTING OPENING SHAPE STYLEUNTHREADED HOLE
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 1979981?
1979981 is a COVER,ACCESS.
What is the NSN for 1979981?
1979981 is cataloged in the U.S. Government catalog under NSN 5340-01-406-9190. 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.