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Technical Data Sheet
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6558519 — 6558519

✓ Government record, cited
NAVAL SEA SYSTEMS COMMAND · HOSE FITTING
PRODUCT OVERVIEW

6558519: 6558519.

The 6558519 is a NAVAL SEA SYSTEMS COMMAND industrial component. This part is cataloged in the U.S. Government catalog under NSN 4730-01-453-8961, 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
6558519
NSN: 4730-01-453-8961
NIINs: 014538961, 014538966, 014565073
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
Part Number6558519
ManufacturerNAVAL SEA SYSTEMS COMMAND
NSN4730-01-453-8961
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 6558519 · NAVAL SEA SYSTEMS COMMAND ⚠ 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
•
CONNECTION STYLE: FLARED ALL ENDS
•
CONNECTION TYPE: THREADED EXTERNAL TUBE FIRST FLUID END CONNECTION
•
STYLE DESIGNATOR: MALE COUPLING HALF
•
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 0.375 INCHES ALL ENDS IN
•
NOMINAL THREAD SIZE: 0.562 INCHES ALL ENDS IN
•
SEAT ANGLE: 37.0 DEGREES
•
EXTERIOR COLOR: WHITE
TECHNICAL CHARACTERISTICS
CONNECTION STYLEFLARED ALL ENDS
CONNECTION TYPETHREADED EXTERNAL TUBE FIRST FLUID END CONNECTION
STYLE DESIGNATORMALE COUPLING HALF
OVERALL LENGTH2.380 INCHES MINIMUM AND 2.600 INCHES MAXIMUM IN
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.375 INCHES ALL ENDS IN
NOMINAL THREAD SIZE0.562 INCHES ALL ENDS IN
SEAT ANGLE37.0 DEGREES
EXTERIOR COLORWHITE
THREAD CLASS2A ALL ENDS A
END ITEM IDENTIFICATIONTORPEDO,ADCAP 48
SUBSTITUTES & CROSS-REFERENCES 4
7447281-3Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
7447281Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
SS-QC6-B-6ANK6Reference document
Same NSN cross-reference
Reference document — Secondary reference
6558519-3Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 6558519?
6558519 is a 6558519 manufactured by NAVAL SEA SYSTEMS COMMAND.
What parts can replace 6558519?
There are 4 known substitutes for 6558519: 7447281-3, 7447281, SS-QC6-B-6ANK6 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 6558519?
6558519 is cataloged in the U.S. Government catalog under NSN 4730-01-453-8961. 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.