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AL4003457 — COUPLING HALF,QUICK DISCONNECT

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

AL4003457: COUPLING HALF,QUICK DISCONNECT.

The COUPLING HALF,QUICK DISCONNECT is a the manufacturer industrial component. Key specifications include material: STEEL BODY, overall_length: 2.03 INCHES NOMINAL IN, connection_type: AIR CHUCK QUICK DISCONNECT SECOND FLUID END CONNECTION, style_designator: MALE COUPLING HALF, surface_treatment: ZINC BODY, operating_pressure: 6500.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-677-5440, 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
AL4003457
NSN: 4730-01-677-5440
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 0F875 — GENERAL DYNAMICS ORDNANCE AND TACTICAL SYSTEMS, INC. (USA)
SPECIFICATIONS
materialSTEEL BODY
overall_length2.03 INCHES NOMINAL IN
connection_typeAIR CHUCK QUICK DISCONNECT SECOND FLUID END CONNECTION
style_designatorMALE COUPLING HALF
surface_treatmentZINC BODY
operating_pressure6500.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
nominal_thread_size0.25 INCHES FIRST FLUID END CONNECTION IN
maximum_operating_temp200.0 FAHRENHEIT SINGLE RESPONSE DEGF
end_item_identification2355016275147
thread_quantity_per_inch18 FIRST FLUID END CONNECTION
thread_series_designatorNPT FIRST FLUID END CONNECTION
quick_disconnect_nominal_size0.4375 INCHES SECOND FLUID END CONNECTION IN
NSN4730-01-677-5440
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: AL4003457 · 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
•
CONNECTION TYPE: THREADED EXTERNAL HOSE FIRST FLUID END CONNECTION
•
STYLE DESIGNATOR: MALE COUPLING HALF
•
OPERATING PRESSURE: 6500.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
•
QUICK DISCONNECT NOMINAL SIZE: 0.4375 INCHES SECOND FLUID END CONNECTION IN
•
NOMINAL THREAD SIZE: 0.25 INCHES FIRST FLUID END CONNECTION IN
•
MAXIMUM OPERATING TEMP: 200.0 FAHRENHEIT SINGLE RESPONSE DEGF
TECHNICAL CHARACTERISTICS
CONNECTION TYPETHREADED EXTERNAL HOSE FIRST FLUID END CONNECTION
CONNECTION TYPEAIR CHUCK QUICK DISCONNECT SECOND FLUID END CONNECTION
STYLE DESIGNATORMALE COUPLING HALF
OVERALL LENGTH2.03 INCHES NOMINAL IN
OPERATING PRESSURE6500.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
QUICK DISCONNECT NOMINAL SIZE0.4375 INCHES SECOND FLUID END CONNECTION IN
NOMINAL THREAD SIZE0.25 INCHES FIRST FLUID END CONNECTION IN
MAXIMUM OPERATING TEMP200.0 FAHRENHEIT SINGLE RESPONSE DEGF
SURFACE TREATMENTZINC BODY
END ITEM IDENTIFICATION2355016275147
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
5315K470Same 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 AL4003457?
AL4003457 is a COUPLING HALF,QUICK DISCONNECT.
What parts can replace AL4003457?
There is 1 known substitute for AL4003457: 5315K470. Substitute compatibility should be verified for your specific system.
What is the NSN for AL4003457?
AL4003457 is cataloged in the U.S. Government catalog under NSN 4730-01-677-5440. 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.