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155S4-4D — COUPLING HALF,SELF-SEALING

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

155S4-4D: COUPLING HALF,SELF-SEALING.

The COUPLING HALF,SELF-SEALING is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY BODY, seat_angle: 37.0 DEGREES LOCATION NOT OTHERWISE SPECIFIED, thread_class: 3A ALL ENDS3A ALL ENDS A, overall_length: 2.160 INCHES NOMINAL2.160 INCHES NOMINAL IN, connection_type: THREADED EXTERNAL TUBE FIRST FLUID END CONNECTIONTHREADED EXTERNAL TUBE FIRST FLUID END CONNECTION, connection_style: FLARED ALL ENDSFLARED ALL ENDS. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-495-4875, 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
155S4-4D
NSN: 4730-00-495-4875
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: R1120 — SATAIR A/S (DNK)
SPECIFICATIONS
materialALUMINUM ALLOY BODY
seat_angle37.0 DEGREES LOCATION NOT OTHERWISE SPECIFIED
thread_class3A ALL ENDS3A ALL ENDS A
overall_length2.160 INCHES NOMINAL2.160 INCHES NOMINAL IN
connection_typeTHREADED EXTERNAL TUBE FIRST FLUID END CONNECTIONTHREADED EXTERNAL TUBE FIRST FLUID END CONNECTION
connection_styleFLARED ALL ENDSFLARED ALL ENDS
style_designatorMALE COUPLING HALF
basic_shape_styleROUND MOUNTING FLANGEROUND MOUNTING FLANGE
features_providedSELF-SEALINGSELF-SEALING
surface_treatmentANODIZE BODY
bolt_hole_quantity66
operating_pressure30000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
NSN4730-00-495-4875
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 155S4-4D · 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: FLARED ALL ENDSFLARED ALL ENDS
•
BOLT CIRCLE NOMINAL DIAMETER: 1.437 INCHES IN
•
MATING END IDENTIFICATION: AEROQUIP MFG CO COUPLING HALF,SELF SEALING PART NO.155S1-4DAEROQUIP MFG CO COUPLING HALF,SELF SEALING PART NO.155S1-4D
•
CONNECTION TYPE: THREADED EXTERNAL TUBE FIRST FLUID END CONNECTIONTHREADED EXTERNAL TUBE FIRST FLUID END CONNECTION
•
STYLE DESIGNATOR: MALE COUPLING HALF
•
BOLT HOLE NOMINAL DIAMETER: 0.201 INCHES IN
•
OPERATING PRESSURE: 30000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
TECHNICAL CHARACTERISTICS
CONNECTION STYLEFLARED ALL ENDSFLARED ALL ENDS
BOLT CIRCLE NOMINAL DIAMETER1.437 INCHES IN
MATING END IDENTIFICATIONAEROQUIP MFG CO COUPLING HALF,SELF SEALING PART NO.155S1-4DAEROQUIP MFG CO COUPLING HALF,SELF SEALING PART NO.155S1-4D
CONNECTION TYPETHREADED EXTERNAL TUBE FIRST FLUID END CONNECTIONTHREADED EXTERNAL TUBE FIRST FLUID END CONNECTION
STYLE DESIGNATORMALE COUPLING HALF
OVERALL LENGTH2.160 INCHES NOMINAL2.160 INCHES NOMINAL IN
BOLT HOLE NOMINAL DIAMETER0.201 INCHES IN
OPERATING PRESSURE30000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
MOUNTING FLANGE LOCATIONFIRST LEGFIRST LEG
FEATURES PROVIDEDSELF-SEALINGSELF-SEALING
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 1
AE73657ESame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 155S4-4D?
155S4-4D is a COUPLING HALF,SELF-SEALING.
What parts can replace 155S4-4D?
There is 1 known substitute for 155S4-4D: AE73657E. Substitute compatibility should be verified for your specific system.
What is the NSN for 155S4-4D?
155S4-4D is cataloged in the U.S. Government catalog under NSN 4730-00-495-4875. 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.