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1551AS474 — COUPLING HALF,QUICK DISCONNECT

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

1551AS474: COUPLING HALF,QUICK DISCONNECT.

The COUPLING HALF,QUICK DISCONNECT is a the manufacturer industrial component. Key specifications include material: STEEL BODY, leg_length: 1.500 INCHES NOMINAL IN, seat_angle: 37.0 DEGREES, thread_class: 2A ALL ENDS A, exterior_color: GREEN, overall_length: 4.641 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-301-1631, 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
1551AS474
NSN: 4730-01-301-1631
NIINs: 013011631, 013018010
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 30003 — NAVAL AIR SYSTEMS COMMAND MANAGED ORIGINAL DESIGN ACTIVITY NOT MATERIAL/PARTS SUPPLIER (USA)
SPECIFICATIONS
materialSTEEL BODY
leg_length1.500 INCHES NOMINAL IN
seat_angle37.0 DEGREES
thread_class2A ALL ENDS A
exterior_colorGREEN
overall_length4.641 INCHES NOMINAL IN
connection_typeTHREADED EXTERNAL TUBE FIRST FLUID END CONNECTION
connection_styleINVERTED FLARE ALL ENDS
special_featuresBULKHEAD ON FLUID END 0.437-20 THSD SIZE
style_designatorMALE COUPLING HALF
features_providedSAFETY LOCKING FEATURE
nominal_thread_size0.437 INCHES ALL ENDS IN
NSN4730-01-301-1631
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 1551AS474 · 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
•
FURNISHED ITEMS AND QUANTITY: 1 LOCKNUT
•
CONNECTION STYLE: INVERTED FLARE ALL ENDS
•
CONNECTION TYPE: THREADED EXTERNAL TUBE FIRST FLUID END CONNECTION
•
STYLE DESIGNATOR: MALE COUPLING HALF
•
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 0.250 INCHES ALL ENDS IN
•
LEG LENGTH: 1.500 INCHES NOMINAL IN
•
NOMINAL THREAD SIZE: 0.437 INCHES ALL ENDS IN
TECHNICAL CHARACTERISTICS
FURNISHED ITEMS AND QUANTITY1 LOCKNUT
CONNECTION STYLEINVERTED FLARE ALL ENDS
CONNECTION TYPETHREADED EXTERNAL TUBE FIRST FLUID END CONNECTION
STYLE DESIGNATORMALE COUPLING HALF
OVERALL LENGTH4.641 INCHES NOMINAL IN
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.250 INCHES ALL ENDS IN
LEG LENGTH1.500 INCHES NOMINAL IN
NOMINAL THREAD SIZE0.437 INCHES ALL ENDS IN
SEAT ANGLE37.0 DEGREES
EXTERIOR COLORGREEN
SUBSTITUTES & CROSS-REFERENCES 1
1551AS474-2Same 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 1551AS474?
1551AS474 is a COUPLING HALF,QUICK DISCONNECT.
What parts can replace 1551AS474?
There is 1 known substitute for 1551AS474: 1551AS474-2. Substitute compatibility should be verified for your specific system.
What is the NSN for 1551AS474?
1551AS474 is cataloged in the U.S. Government catalog under NSN 4730-01-301-1631. 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.