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Technical Data Sheet
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505551-1550 — COUPLING ASSEMBLY,QUICK DISCONNE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

505551-1550: COUPLING ASSEMBLY,QUICK DISCONNE.

COUPLING ASSEMBLY,QUICK DISCONNE. This part is cataloged in the U.S. Government catalog under NSN 4730-01-723-3755, 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
505551-1550
NSN: 4730-01-723-3755
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 75477 — FM AF, LLC DBA AMERICAN FAN COMPANY (USA)
SPECIFICATIONS
Part Number505551-1550
NSN4730-01-723-3755
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 505551-1550 · 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
SUBSTITUTES & CROSS-REFERENCES 2
FF-19119Reference document
Same NSN cross-reference
Reference document — Drawing number reference only
FF-19119-3Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 505551-1550?
505551-1550 is a COUPLING ASSEMBLY,QUICK DISCONNE.
What parts can replace 505551-1550?
There are 2 known substitutes for 505551-1550: FF-19119, FF-19119-3. Substitute compatibility should be verified for your specific system.
What is the NSN for 505551-1550?
505551-1550 is cataloged in the U.S. Government catalog under NSN 4730-01-723-3755. This indicates validated use in U.S. government and defense supply chains.
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