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4088779 — CROSS,TUBE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

4088779: CROSS,TUBE.

The CROSS,TUBE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, thread_class: 3A SECOND END A, connection_type: THREADED EXTERNAL TUBE FOURTH END, connection_style: GRIPPING NIPPLE (NOSE) SECOND END, nominal_thread_size: 0.875 INCHES FOURTH END IN, thread_series_designator: UNIFIED NATIONAL JOINT FINE (UNJF) SECOND END. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-577-3400, 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
4088779
NSN: 4730-01-577-3400
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 77445 — RTX CORPORATION DBA PRATT & WHITNEY DIV PRATT &WHITNEY (USA)
SPECIFICATIONS
materialSTEEL OVERALL
thread_class3A SECOND END A
connection_typeTHREADED EXTERNAL TUBE FOURTH END
connection_styleGRIPPING NIPPLE (NOSE) SECOND END
nominal_thread_size0.875 INCHES FOURTH END IN
thread_series_designatorUNIFIED NATIONAL JOINT FINE (UNJF) SECOND END
material_document_and_classificationAMS 5646 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
part_name_assigned_by_controlling_agencyCONNECTOR TUBE NUMBER 1 BEARING
nominal_inside_diameter_hose_accommodated0.675 INCHES THIRD END IN
NSN4730-01-577-3400
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 4088779 · 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 (TUBE) FIRST END
•
NOMINAL INSIDE DIAMETER HOSE ACCOMMODATED: 0.675 INCHES THIRD END IN
•
CONNECTION TYPE: THREADED EXTERNAL TUBE FIRST END
TECHNICAL CHARACTERISTICS
CONNECTION STYLEFLARED (TUBE) FIRST END
CONNECTION STYLEGRIPPING NIPPLE (NOSE) SECOND END
CONNECTION STYLEGRIPPING NIPPLE (NOSE) FOURTH END
CONNECTION STYLEGROOVED (HOSE) THIRD END
NOMINAL INSIDE DIAMETER HOSE ACCOMMODATED0.675 INCHES THIRD END IN
CONNECTION TYPETHREADED EXTERNAL TUBE FIRST END
CONNECTION TYPETHREADED EXTERNAL TUBE SECOND END
CONNECTION TYPEUNTHREADED EXTERNAL HOSE THIRD END
CONNECTION TYPETHREADED EXTERNAL TUBE FOURTH END
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5646 ASSN STD SINGLE MATERIAL RESPONSE 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 4088779?
4088779 is a CROSS,TUBE.
What is the NSN for 4088779?
4088779 is cataloged in the U.S. Government catalog under NSN 4730-01-577-3400. 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.