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4256495 — PLUG,PROTECTIVE,DUST AND MOISTUR

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

4256495: PLUG,PROTECTIVE,DUST AND MOISTUR.

PLUG,PROTECTIVE,DUST AND MOISTUR. Key specifications include drive_type: HEX HEAD, overall_diameter: 0.540 INCHES NOMINAL IN, special_features: HEX DRIVE ACROSS FLATS: 0.190 INCH NOMINAL IN, end_item_identification: 4210-01-622-0440;TRUCK,FIRE FIGHTING, part_name_assigned_by_controlling_agency: FTG,PLUG ST .25 NPT SPL INHEX. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-656-4293, 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
4256495
NSN: 5340-01-656-4293
FSC: 5340 — Hardware, Commercial
CAGE: 75Q65 — OSHKOSH DEFENSE LLC (USA)
SPECIFICATIONS
drive_typeHEX HEAD
overall_diameter0.540 INCHES NOMINAL IN
special_featuresHEX DRIVE ACROSS FLATS: 0.190 INCH NOMINAL IN
end_item_identification4210-01-622-0440;TRUCK,FIRE FIGHTING
part_name_assigned_by_controlling_agencyFTG,PLUG ST .25 NPT SPL INHEX
NSN5340-01-656-4293
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 4256495 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
•
OVERALL DIAMETER: 0.540 INCHES NOMINAL IN
•
DRIVE TYPE: HEX HEAD
TECHNICAL CHARACTERISTICS
OVERALL DIAMETER0.540 INCHES NOMINAL IN
DRIVE TYPEHEX HEAD
SPECIAL FEATURESHEX DRIVE ACROSS FLATS: 0.190 INCH NOMINAL IN
PART NAME ASSIGNED BY CONTROLLING AGENCYFTG,PLUG ST .25 NPT SPL INHEX
END ITEM IDENTIFICATION4210-01-622-0440;TRUCK,FIRE FIGHTING
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 4256495?
4256495 is a PLUG,PROTECTIVE,DUST AND MOISTUR.
What is the NSN for 4256495?
4256495 is cataloged in the U.S. Government catalog under NSN 5340-01-656-4293. 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.