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D4S4 — COUPLING HALF,QUICK DISCONNECT

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

D4S4: COUPLING HALF,QUICK DISCONNECT.

The COUPLING HALF,QUICK DISCONNECT is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, nominal_length: 2.530 INCHES IN, connection_type: UNTHREADED EXTERNAL HOSE FIRST FLUID END CONNECTION, connection_style: BARBED OR SERRATED END FIRST FLUID END CONNECTION, special_features: SECOND END PLUG; HOSE OD 0.75 INCHES IN, style_designator: FEMALE COUPLING HALF. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-656-3918, 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
D4S4
NSN: 4730-01-656-3918
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 72661 — DIXON VALVE & COUPLING COMPANY, LLC DIV DIXON FIRE (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nominal_length2.530 INCHES IN
connection_typeUNTHREADED EXTERNAL HOSE FIRST FLUID END CONNECTION
connection_styleBARBED OR SERRATED END FIRST FLUID END CONNECTION
special_featuresSECOND END PLUG; HOSE OD 0.75 INCHES IN
style_designatorFEMALE COUPLING HALF
basic_shape_styleROUND ALL ENDS
maximum_operating_temp250.0 FAHRENHEIT SINGLE RESPONSE DEGF
quick_disconnect_nominal_size0.500 INCHES ALL ENDS IN
part_name_assigned_by_controlling_agencyDF SERIES INDUSTRIAL PLUG STANDARD HOSE BARB
nominal_inside_diameter_hose_accommodated0.500 INCHES FIRST FLUID END CONNECTION IN
NSN4730-01-656-3918
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: D4S4 · 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: BARBED OR SERRATED END FIRST FLUID END CONNECTION
•
NOMINAL LENGTH: 2.530 INCHES IN
•
NOMINAL INSIDE DIAMETER HOSE ACCOMMODATED: 0.500 INCHES FIRST FLUID END CONNECTION IN
•
CONNECTION TYPE: UNTHREADED EXTERNAL HOSE FIRST FLUID END CONNECTION
•
STYLE DESIGNATOR: FEMALE COUPLING HALF
•
QUICK DISCONNECT NOMINAL SIZE: 0.500 INCHES ALL ENDS IN
•
BASIC SHAPE STYLE: ROUND ALL ENDS
•
MAXIMUM OPERATING TEMP: 250.0 FAHRENHEIT SINGLE RESPONSE DEGF
TECHNICAL CHARACTERISTICS
CONNECTION STYLEBARBED OR SERRATED END FIRST FLUID END CONNECTION
NOMINAL LENGTH2.530 INCHES IN
NOMINAL INSIDE DIAMETER HOSE ACCOMMODATED0.500 INCHES FIRST FLUID END CONNECTION IN
CONNECTION TYPEUNTHREADED EXTERNAL HOSE FIRST FLUID END CONNECTION
STYLE DESIGNATORFEMALE COUPLING HALF
QUICK DISCONNECT NOMINAL SIZE0.500 INCHES ALL ENDS IN
BASIC SHAPE STYLEROUND ALL ENDS
MAXIMUM OPERATING TEMP250.0 FAHRENHEIT SINGLE RESPONSE DEGF
SPECIAL FEATURESSECOND END PLUG; HOSE OD 0.75 INCHES IN
PART NAME ASSIGNED BY CONTROLLING AGENCYDF SERIES INDUSTRIAL PLUG STANDARD HOSE BARB
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: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is D4S4?
D4S4 is a COUPLING HALF,QUICK DISCONNECT.
What is the NSN for D4S4?
D4S4 is cataloged in the U.S. Government catalog under NSN 4730-01-656-3918. 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.