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581438-020 — COUPLING HALF,QUICK DISCONNECT

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

581438-020: COUPLING HALF,QUICK DISCONNECT.

The COUPLING HALF,QUICK DISCONNECT is a the manufacturer industrial component. Key specifications include material: STEEL BODY, thread_class: 3A ALL ENDS A, exterior_color: GREEN, overall_length: 3.220 INCHES NOMINAL IN, connection_type: THREADED EXTERNAL BOSS FIRST FLUID END CONNECTION, connection_style: DOUBLE THREADED SECTION BOSS FITTING GASKET W/LOCKNUT SEALING ALL ENDS. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-366-9404, 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
581438-020
NSN: 4730-01-366-9404
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 75906 — PACIFIC CONSOLIDATED INDUSTRIES LLC (USA)
SPECIFICATIONS
materialSTEEL BODY
thread_class3A ALL ENDS A
exterior_colorGREEN
overall_length3.220 INCHES NOMINAL IN
connection_typeTHREADED EXTERNAL BOSS FIRST FLUID END CONNECTION
connection_styleDOUBLE THREADED SECTION BOSS FITTING GASKET W/LOCKNUT SEALING ALL ENDS
special_featuresBULKHEAD ON FLUID END
style_designatorMALE COUPLING HALF
nominal_thread_size0.438 INCHES ALL ENDS IN
quick_disconnect_methodPUSH-PULL ALL ENDS
thread_series_designatorUNF ALL ENDS
NSN4730-01-366-9404
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 581438-020 · 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: DOUBLE THREADED SECTION BOSS FITTING GASKET W/LOCKNUT SEALING ALL ENDS
•
CONNECTION TYPE: THREADED EXTERNAL BOSS FIRST FLUID END CONNECTION
•
STYLE DESIGNATOR: MALE COUPLING HALF
•
NOMINAL THREAD SIZE: 0.438 INCHES ALL ENDS IN
•
EXTERIOR COLOR: GREEN
•
THREAD CLASS: 3A ALL ENDS A
TECHNICAL CHARACTERISTICS
CONNECTION STYLEDOUBLE THREADED SECTION BOSS FITTING GASKET W/LOCKNUT SEALING ALL ENDS
CONNECTION TYPETHREADED EXTERNAL BOSS FIRST FLUID END CONNECTION
STYLE DESIGNATORMALE COUPLING HALF
OVERALL LENGTH3.220 INCHES NOMINAL IN
NOMINAL THREAD SIZE0.438 INCHES ALL ENDS IN
EXTERIOR COLORGREEN
SPECIAL FEATURESBULKHEAD ON FLUID END
THREAD CLASS3A ALL ENDS A
MATERIALSTEEL BODY
QUICK DISCONNECT METHODPUSH-PULL ALL ENDS
SUBSTITUTES & CROSS-REFERENCES 2
581438Reference document
Same NSN cross-reference
Reference document — Drawing number reference only
SS-QT2-B1-400K3Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)Demilitarization required — critical (Q)
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FREQUENTLY ASKED QUESTIONS
What is 581438-020?
581438-020 is a COUPLING HALF,QUICK DISCONNECT.
What parts can replace 581438-020?
There are 2 known substitutes for 581438-020: 581438, SS-QT2-B1-400K3. Substitute compatibility should be verified for your specific system.
What is the NSN for 581438-020?
581438-020 is cataloged in the U.S. Government catalog under NSN 4730-01-366-9404. 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.