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63221-6 — COUPLING ASSEMBLY,TUBE,FLEXIBLE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

63221-6: COUPLING ASSEMBLY,TUBE,FLEXIBLE.

COUPLING ASSEMBLY,TUBE,FLEXIBLE. Key specifications include material: ALUMINUM ALLOY 2024, overall_length: 2.963 INCHES MAXIMUM IN, outside_diameter: 1.031 INCHES MAXIMUM IN, style_designator: FLEXIBLE COUPLING ASSEMBLY, tube_outside_diameter_for_which_designed: 0.375 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-044-3943, 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
63221-6
NSN: 4730-01-044-3943
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 79326 — TRANSDIGM INC DIV ADELWIGGINS GROUP (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 2024
overall_length2.963 INCHES MAXIMUM IN
outside_diameter1.031 INCHES MAXIMUM IN
style_designatorFLEXIBLE COUPLING ASSEMBLY
tube_outside_diameter_for_which_designed0.375 INCHES NOMINAL IN
NSN4730-01-044-3943
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 63221-6 · 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: 0.375 INCHES NOMINAL IN
•
STYLE DESIGNATOR: FLEXIBLE COUPLING ASSEMBLY
•
OUTSIDE DIAMETER: 1.031 INCHES MAXIMUM IN
•
MATERIAL: ALUMINUM ALLOY 2024
TECHNICAL CHARACTERISTICS
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED0.375 INCHES NOMINAL IN
STYLE DESIGNATORFLEXIBLE COUPLING ASSEMBLY
OVERALL LENGTH2.963 INCHES MAXIMUM IN
OUTSIDE DIAMETER1.031 INCHES MAXIMUM IN
MATERIALALUMINUM ALLOY 2024
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 1
GC550GR6Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Terminal item — stock exhausted; no further procurementNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 63221-6?
63221-6 is a COUPLING ASSEMBLY,TUBE,FLEXIBLE.
What parts can replace 63221-6?
There is 1 known substitute for 63221-6: GC550GR6. Substitute compatibility should be verified for your specific system.
What is the NSN for 63221-6?
63221-6 is cataloged in the U.S. Government catalog under NSN 4730-01-044-3943. 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.