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6990412 — PLUG,PROTECTIVE,DUST AND MOISTUR

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

6990412: PLUG,PROTECTIVE,DUST AND MOISTUR.

PLUG,PROTECTIVE,DUST AND MOISTUR. Key specifications include material: PLASTIC, design_type: FRICTION, overall_diameter: 2.125 INCHES NOMINAL IN, features_provided: SHOULDER, material_document_and_classification: AMS 3571/9 ASSN STD SINGLE MATERIAL RESPONSE, opening_inside_diameter_for_which_designed: 1.968 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-436-1762, 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
6990412
NSN: 5340-01-436-1762
FSC: 5340 — Hardware, Commercial
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
materialPLASTIC
design_typeFRICTION
overall_diameter2.125 INCHES NOMINAL IN
features_providedSHOULDER
material_document_and_classificationAMS 3571/9 ASSN STD SINGLE MATERIAL RESPONSE
opening_inside_diameter_for_which_designed1.968 INCHES NOMINAL IN
NSN5340-01-436-1762
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 6990412 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
•
DESIGN TYPE: FRICTION
•
OVERALL DIAMETER: 2.125 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 3571/9 ASSN STD SINGLE MATERIAL RESPONSE
•
FEATURES PROVIDED: SHOULDER
•
OPENING INSIDE DIAMETER FOR WHICH DESIGNED: 1.968 INCHES NOMINAL IN
•
MATERIAL: PLASTIC
TECHNICAL CHARACTERISTICS
DESIGN TYPEFRICTION
OVERALL DIAMETER2.125 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 3571/9 ASSN STD SINGLE MATERIAL RESPONSE
FEATURES PROVIDEDSHOULDER
OPENING INSIDE DIAMETER FOR WHICH DESIGNED1.968 INCHES NOMINAL IN
MATERIALPLASTIC
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 6990412?
6990412 is a PLUG,PROTECTIVE,DUST AND MOISTUR.
What is the NSN for 6990412?
6990412 is cataloged in the U.S. Government catalog under NSN 5340-01-436-1762. 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.