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U540027 — OUTLET,BOSS

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

U540027: OUTLET,BOSS.

The OUTLET,BOSS is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY OVERALL, thread_class: 3B FIRST END, connection_type: THREADED INTERNAL BOSS FIRST END, connection_style: GASKET SEAL (BOSS) FIRST END, style_designator: PLAIN, mounting_end_type: CONCAVE. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-374-7129, 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
U540027
NSN: 4730-01-374-7129
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 78943 — TRIUMPH THERMAL SYSTEMS, LLC (USA)
SPECIFICATIONS
materialALUMINUM ALLOY OVERALL
thread_class3B FIRST END
connection_typeTHREADED INTERNAL BOSS FIRST END
connection_styleGASKET SEAL (BOSS) FIRST END
style_designatorPLAIN
mounting_end_typeCONCAVE
nominal_thread_size0.750 INCHES FIRST END IN
nominal_overall_length1.690 INCHES IN
thread_series_designatorUNIFIED NATIONAL JOINT FINE (UNJF) FIRST END
material_document_and_classificationAMS4150 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
nominal_outside_diameter_tube_accommodated0.500 INCHES FIRST END IN
NSN4730-01-374-7129
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: U540027 · 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
•
MOUNTING END TYPE: CONCAVE
•
CONNECTION STYLE: GASKET SEAL (BOSS) FIRST END
•
NOMINAL OVERALL LENGTH: 1.690 INCHES IN
•
CONNECTION TYPE: THREADED INTERNAL BOSS FIRST END
•
STYLE DESIGNATOR: PLAIN
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS4150 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 0.500 INCHES FIRST END IN
•
NOMINAL THREAD SIZE: 0.750 INCHES FIRST END IN
TECHNICAL CHARACTERISTICS
MOUNTING END TYPECONCAVE
CONNECTION STYLEGASKET SEAL (BOSS) FIRST END
NOMINAL OVERALL LENGTH1.690 INCHES IN
CONNECTION TYPETHREADED INTERNAL BOSS FIRST END
STYLE DESIGNATORPLAIN
MATERIAL DOCUMENT AND CLASSIFICATIONAMS4150 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.500 INCHES FIRST END IN
NOMINAL THREAD SIZE0.750 INCHES FIRST END IN
THREAD CLASS3B FIRST END
MATERIALALUMINUM ALLOY OVERALL
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 U540027?
U540027 is a OUTLET,BOSS.
What is the NSN for U540027?
U540027 is cataloged in the U.S. Government catalog under NSN 4730-01-374-7129. 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.