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12J71-56C — COUPLING ASSEMBLY,TUBE,FLEXIBLE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

12J71-56C: COUPLING ASSEMBLY,TUBE,FLEXIBLE.

COUPLING ASSEMBLY,TUBE,FLEXIBLE. Key specifications include material: STEEL CORROSION RESISTING, overall_length: 4.119 INCHES NOMINAL IN, outside_diameter: 4.390 INCHES NOMINAL IN, special_features: PASSIVATE FINISH, style_designator: FLEXIBLE COUPLING ASSEMBLY, tube_outside_diameter_for_which_designed: 3.500 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-520-9955, 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
12J71-56C
NSN: 4730-01-520-9955
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 24984 — HYDRAFLOW (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING
overall_length4.119 INCHES NOMINAL IN
outside_diameter4.390 INCHES NOMINAL IN
special_featuresPASSIVATE FINISH
style_designatorFLEXIBLE COUPLING ASSEMBLY
tube_outside_diameter_for_which_designed3.500 INCHES NOMINAL IN
NSN4730-01-520-9955
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 12J71-56C · OEM ⚠ VERIFY BEFORE ORDERING NPT ≠ BSPT — tapered threads look identical but are NOT interchangeable. Wrong thread = leak. JIC (37°) ≠ AN (37°) ≠ SAE 45° — flare angles must match exactly. Measure thread pitch with gauge — visual identification is unreliable ✓ BROKER TIP Always use thread sealant (PTFE tape or pipe compound) on tapered threads (NPT/BSPT). JIC/AN flare fittings seal metal-to-metal — never use tape on flare connections PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED: 3.500 INCHES NOMINAL IN
•
STYLE DESIGNATOR: FLEXIBLE COUPLING ASSEMBLY
•
OUTSIDE DIAMETER: 4.390 INCHES NOMINAL IN
•
MATERIAL: STEEL CORROSION RESISTING
TECHNICAL CHARACTERISTICS
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED3.500 INCHES NOMINAL IN
STYLE DESIGNATORFLEXIBLE COUPLING ASSEMBLY
OVERALL LENGTH4.119 INCHES NOMINAL IN
OUTSIDE DIAMETER4.390 INCHES NOMINAL IN
SPECIAL FEATURESPASSIVATE FINISH
MATERIALSTEEL CORROSION RESISTING
OTHER ITEMS IN FSC 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4730-00-000-1895 4730-00-000-4289 4730-00-000-4445 4730-00-000-8373 4730-00-000-8897 4730-00-001-0007 4730-00-001-0008
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 12J71-56C?
12J71-56C is a COUPLING ASSEMBLY,TUBE,FLEXIBLE.
What is the NSN for 12J71-56C?
12J71-56C is cataloged in the U.S. Government catalog under NSN 4730-01-520-9955. 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.