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4FM4 — COUPLING HALF,QUICK DISCONNECT

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

4FM4: COUPLING HALF,QUICK DISCONNECT.

The COUPLING HALF,QUICK DISCONNECT is a the manufacturer industrial component. Key specifications include diameter: 0.281 INCHES NOMINAL IN, material: STEEL, cut_length: 0.562 INCHES NOMINAL IN, shank_type: WELDON, design_form: DOUBLE END, flute_design: HELICAL. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-342-6055, 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
4FM4
NSN: 4730-01-342-6055
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 24869 — DVCC, LLC (USA)
SPECIFICATIONS
diameter0.281 INCHES NOMINAL IN
materialSTEEL
cut_length0.562 INCHES NOMINAL IN
shank_typeWELDON
design_formDOUBLE END
flute_designHELICAL
overall_width5.188 INCHES NOMINAL IN
flute_quantity2
overall_height7.313 INCHES NOMINAL IN
overall_length8.750 INCHES NOMINAL IN
shank_diameter0.375 INCHES NOMINAL IN
helix_directionRIGHT-HAND
NSN4730-01-342-6055
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 4FM4 · 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
SUBSTITUTES & CROSS-REFERENCES 1
DC-9Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 4FM4?
4FM4 is a COUPLING HALF,QUICK DISCONNECT.
What parts can replace 4FM4?
There is 1 known substitute for 4FM4: DC-9. Substitute compatibility should be verified for your specific system.
What is the NSN for 4FM4?
4FM4 is cataloged in the U.S. Government catalog under NSN 4730-01-342-6055. 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.