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3H20689-111 — COVER,ACCESS

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

3H20689-111: COVER,ACCESS.

The COVER,ACCESS is a the manufacturer industrial component. Key specifications include material: PLASTIC, hole_diameter: 0.375 INCHES MINIMUM AND 0.381 INCHES MAXIMUM IN, features_provided: SEALING CAPABILITY AND OBSERVATION FACILITY, securing_device_type: THREADED FASTENER, mounting_opening_shape_style: UNTHREADED HOLE. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-910-1948, 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
3H20689-111
NSN: 5340-00-910-1948
FSC: 5340 — Hardware, Commercial
CAGE: 98897 — LOCKHEED MARTIN CORP (USA)
SPECIFICATIONS
materialPLASTIC
hole_diameter0.375 INCHES MINIMUM AND 0.381 INCHES MAXIMUM IN
features_providedSEALING CAPABILITY AND OBSERVATION FACILITY
securing_device_typeTHREADED FASTENER
mounting_opening_shape_styleUNTHREADED HOLE
NSN5340-00-910-1948
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 3H20689-111 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
•
MOUNTING OPENING SHAPE STYLE: UNTHREADED HOLE
•
FEATURES PROVIDED: SEALING CAPABILITY AND OBSERVATION FACILITY
•
SECURING DEVICE TYPE: THREADED FASTENER
•
MATERIAL: PLASTIC
•
HOLE DIAMETER: 0.375 INCHES MINIMUM AND 0.381 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
MOUNTING OPENING SHAPE STYLEUNTHREADED HOLE
FEATURES PROVIDEDSEALING CAPABILITY AND OBSERVATION FACILITY
SECURING DEVICE TYPETHREADED FASTENER
MATERIALPLASTIC
HOLE DIAMETER0.375 INCHES MINIMUM AND 0.381 INCHES MAXIMUM IN
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 3H20689-111?
3H20689-111 is a COVER,ACCESS.
What is the NSN for 3H20689-111?
3H20689-111 is cataloged in the U.S. Government catalog under NSN 5340-00-910-1948. 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.