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831751-401 — COUPLING HALF,QUICK DISCONNECT

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

831751-401: 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: 0.512 INCHES NOMINAL IN, thread_class: 3A ALL ENDS A, overall_length: 1.970 INCHES NOMINAL IN, connection_type: EXTERNAL QUICK DISCONNECT FIRST QUICK DISCONNECT END, connection_style: EXTERNAL SEAT FOR GASKET SEAL ALL ENDS. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-234-7430, 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
831751-401
NSN: 4730-01-234-7430
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 29780 — MAG AEROSPACE INDUSTRIES, LLC DIV SAFRAN CABINS (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING BODY
leg_length0.512 INCHES NOMINAL IN
thread_class3A ALL ENDS A
overall_length1.970 INCHES NOMINAL IN
connection_typeEXTERNAL QUICK DISCONNECT FIRST QUICK DISCONNECT END
connection_styleEXTERNAL SEAT FOR GASKET SEAL ALL ENDS
special_featuresU/O CREW ESCAPE OF B1B ACFT
style_designatorMALE COUPLING HALF
surface_treatmentCADMIUM AND PASSIVATE BODY
nominal_thread_size0.375 INCHES ALL ENDS IN
quick_disconnect_methodSPRING PUSH-LOCK FIRST QUICK DISCONNECT END
thread_series_designatorUNIFIED NATIONAL JOINT FINE (UNJF) ALL ENDS
NSN4730-01-234-7430
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 831751-401 · 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
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SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TYPE 1,CLASS 2 FED SPEC 1ST TREATMENT RESPONSE AND MIL-S-5002 MIL SPEC 2ND TREATMENT RESPONSE BODY
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CONNECTION STYLE: EXTERNAL SEAT FOR GASKET SEAL ALL ENDS
•
CONNECTION TYPE: THREADED EXTERNAL BOSS FIRST FLUID END CONNECTION
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STYLE DESIGNATOR: MALE COUPLING HALF
•
LEG LENGTH: 0.512 INCHES NOMINAL IN
•
NOMINAL THREAD SIZE: 0.375 INCHES ALL ENDS IN
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TYPE 1,CLASS 2 FED SPEC 1ST TREATMENT RESPONSE AND MIL-S-5002 MIL SPEC 2ND TREATMENT RESPONSE BODY
CONNECTION STYLEEXTERNAL SEAT FOR GASKET SEAL ALL ENDS
CONNECTION TYPETHREADED EXTERNAL BOSS FIRST FLUID END CONNECTION
CONNECTION TYPEEXTERNAL QUICK DISCONNECT FIRST QUICK DISCONNECT END
STYLE DESIGNATORMALE COUPLING HALF
OVERALL LENGTH1.970 INCHES NOMINAL IN
LEG LENGTH0.512 INCHES NOMINAL IN
NOMINAL THREAD SIZE0.375 INCHES ALL ENDS IN
SPECIAL FEATURESU/O CREW ESCAPE OF B1B ACFT
SURFACE TREATMENTCADMIUM AND PASSIVATE BODY
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

No substitute or cross-reference records for this part.

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 831751-401?
831751-401 is a COUPLING HALF,QUICK DISCONNECT.
What is the NSN for 831751-401?
831751-401 is cataloged in the U.S. Government catalog under NSN 4730-01-234-7430. 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.