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6KK738 — FILLER NECK,LIQUID HOLDING UNIT

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

6KK738: FILLER NECK,LIQUID HOLDING UNIT.

FILLER NECK,LIQUID HOLDING UNIT. Key specifications include material: STEEL, specific_use: FILLER NECK FOR RESERVOIR, HYDRAULIC, overall_length: 5.000 INCHES NOMINAL IN, special_features: 40 MICRON; 5 PSI RELIEF VALVE, end_item_identification: MK37, part_name_assigned_by_controlling_agency: NECK, ASSEMBLY. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-526-2004, 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
6KK738
NSN: 5340-01-526-2004
FSC: 5340 — Hardware, Commercial
CAGE: 75Q65 — OSHKOSH DEFENSE LLC (USA)
SPECIFICATIONS
materialSTEEL
specific_useFILLER NECK FOR RESERVOIR, HYDRAULIC
overall_length5.000 INCHES NOMINAL IN
special_features40 MICRON; 5 PSI RELIEF VALVE
end_item_identificationMK37
part_name_assigned_by_controlling_agencyNECK, ASSEMBLY
NSN5340-01-526-2004
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 6KK738 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
•
SPECIFIC USE: FILLER NECK FOR RESERVOIR, HYDRAULIC
•
MATERIAL: STEEL
TECHNICAL CHARACTERISTICS
OVERALL LENGTH5.000 INCHES NOMINAL IN
SPECIFIC USEFILLER NECK FOR RESERVOIR, HYDRAULIC
SPECIAL FEATURES40 MICRON; 5 PSI RELIEF VALVE
PART NAME ASSIGNED BY CONTROLLING AGENCYNECK, ASSEMBLY
END ITEM IDENTIFICATIONMK37
MATERIALSTEEL
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: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 6KK738?
6KK738 is a FILLER NECK,LIQUID HOLDING UNIT.
What is the NSN for 6KK738?
6KK738 is cataloged in the U.S. Government catalog under NSN 5340-01-526-2004. 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.