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1551AS474-1 — COUPLING HALF,QUICK DISCONNECT

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

1551AS474-1: COUPLING HALF,QUICK DISCONNECT.

The COUPLING HALF,QUICK DISCONNECT is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING BODY, leg_length: 3.550 INCHES NOMINAL IN, seat_angle: 20.0 DEGREES, thread_class: 2A ALL ENDS A, overall_length: 4.640 INCHES NOMINAL IN, connection_type: INTERNAL QUICK DISCONNECT ALL ENDS. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-301-8010, 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
1551AS474-1
NSN: 4730-01-301-8010
NIINs: 013018010, 013350385
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 CORROSION RESISTING BODY
leg_length3.550 INCHES NOMINAL IN
seat_angle20.0 DEGREES
thread_class2A ALL ENDS A
overall_length4.640 INCHES NOMINAL IN
connection_typeINTERNAL QUICK DISCONNECT ALL ENDS
connection_styleFLARELESS ALL ENDS
special_featuresCLEANLINESS SHALL BE IN ACCORDANCE WITH MIL-C-52211 FOR OXYGEN SERVICE
style_designatorMALE COUPLING HALF
features_providedSAFETY LOCKING FEATURE
nominal_thread_size0.438 INCHES ALL ENDS IN
end_item_identificationEONS PSA UNIT
NSN4730-01-301-8010
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 1551AS474-1 · 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 STYLE: FLARELESS 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
•
QUICK DISCONNECT NOMINAL SIZE: 0.250 INCHES ALL ENDS IN
•
LEG LENGTH: 1.090 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
CONNECTION STYLEFLARELESS ALL ENDS
CONNECTION TYPETHREADED EXTERNAL TUBE FIRST FLUID END CONNECTION
CONNECTION TYPEINTERNAL QUICK DISCONNECT ALL ENDS
STYLE DESIGNATORMALE COUPLING HALF
OVERALL LENGTH4.640 INCHES NOMINAL IN
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.250 INCHES ALL ENDS IN
QUICK DISCONNECT NOMINAL SIZE0.250 INCHES ALL ENDS IN
LEG LENGTH1.090 INCHES NOMINAL IN
FEATURES PROVIDEDSAFETY LOCKING FEATURE
NOMINAL THREAD SIZE0.438 INCHES ALL ENDS IN
SUBSTITUTES & CROSS-REFERENCES 3
SS-QT4-B1-400Reference document
Same NSN cross-reference
Reference document — Secondary reference
1551AS474Reference document
Same NSN cross-reference
Reference document — Vendor item drawing reference
SS-QTM4A-B1-400Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 1551AS474-1?
1551AS474-1 is a COUPLING HALF,QUICK DISCONNECT.
What parts can replace 1551AS474-1?
There are 3 known substitutes for 1551AS474-1: SS-QT4-B1-400, 1551AS474, SS-QTM4A-B1-400. Substitute compatibility should be verified for your specific system.
What is the NSN for 1551AS474-1?
1551AS474-1 is cataloged in the U.S. Government catalog under NSN 4730-01-301-8010. 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.