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4400512 — PLUG,PROTECTIVE,DUST AND MOISTUR

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

4400512: PLUG,PROTECTIVE,DUST AND MOISTUR.

PLUG,PROTECTIVE,DUST AND MOISTUR. Key specifications include material: PLASTIC, drive_type: SCREW SLOT OR SERRATED, design_type: THREADED, overall_diameter: 0.375 INCHES NOMINAL IN, end_item_identification: MRAP BUFFALO MK2A2, thread_size_and_series/type_designator: 3/8-18 NPT. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-200-8637, 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
4400512
NSN: 5340-00-200-8637
FSC: 5340 — Hardware, Commercial
CAGE: 78943 — TRIUMPH THERMAL SYSTEMS, LLC (USA)
SPECIFICATIONS
materialPLASTIC
drive_typeSCREW SLOT OR SERRATED
design_typeTHREADED
overall_diameter0.375 INCHES NOMINAL IN
end_item_identificationMRAP BUFFALO MK2A2
thread_size_and_series/type_designator3/8-18 NPT
NSN5340-00-200-8637
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 4400512 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: THREADED
•
OVERALL DIAMETER: 0.375 INCHES NOMINAL IN
•
DRIVE TYPE: SCREW SLOT OR SERRATED
•
MATERIAL: PLASTIC
•
THREAD SIZE AND SERIES/TYPE DESIGNATOR: 3/8-18 NPT
TECHNICAL CHARACTERISTICS
DESIGN TYPETHREADED
OVERALL DIAMETER0.375 INCHES NOMINAL IN
DRIVE TYPESCREW SLOT OR SERRATED
END ITEM IDENTIFICATIONMRAP BUFFALO MK2A2
MATERIALPLASTIC
THREAD SIZE AND SERIES/TYPE DESIGNATOR3/8-18 NPT
SUBSTITUTES & CROSS-REFERENCES 7
78261Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
17KP733Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
172-30Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
1604-42Reference document
Same NSN cross-reference
Reference document — Secondary reference
390215Reference document
Same NSN cross-reference
Reference document — Secondary reference
JE696CSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 4400512?
4400512 is a PLUG,PROTECTIVE,DUST AND MOISTUR.
What parts can replace 4400512?
There are 7 known substitutes for 4400512: 78261, 17KP733, 172-30 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 4400512?
4400512 is cataloged in the U.S. Government catalog under NSN 5340-00-200-8637. 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.