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4PHS129-20 — ADAPTER,STRAIGHT,TUBE TO BOSS

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

4PHS129-20: ADAPTER,STRAIGHT,TUBE TO BOSS.

The ADAPTER,STRAIGHT,TUBE TO BOSS is a the manufacturer industrial component. Key specifications include material: TITANIUM ALLOY UNS R54520 OVERALL, thread_class: 3A SECOND END A, connection_type: THREADED EXTERNAL BOSS SECOND END, connection_style: EXTERNAL SEAT FOR GASKET SEAL (BOSS) SECOND END, operating_pressure: 4000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS, nominal_thread_size: 1.578 INCHES SECOND END IN. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-367-9966, 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
4PHS129-20
NSN: 4730-01-367-9966
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 06090 — TE CONNECTIVITY CORPORATION DBA RAYCHEM PRODUCT DIVISION (USA)
SPECIFICATIONS
materialTITANIUM ALLOY UNS R54520 OVERALL
thread_class3A SECOND END A
connection_typeTHREADED EXTERNAL BOSS SECOND END
connection_styleEXTERNAL SEAT FOR GASKET SEAL (BOSS) SECOND END
operating_pressure4000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
nominal_thread_size1.578 INCHES SECOND END IN
maximum_operating_temp275.0 FAHRENHEIT SINGLE RESPONSE DEGF
nominal_overall_length3.236 INCHES IN
thread_quantity_per_inch14 SECOND END
thread_series_designatorUNJS SECOND END
furnished_items_and_quantity1 PREFORMED PACKING
material_document_and_classificationAMS4965 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NSN4730-01-367-9966
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 4PHS129-20 · 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
•
FURNISHED ITEMS AND QUANTITY: 1 PREFORMED PACKING
•
CONNECTION STYLE: EXTERNAL SEAT FOR GASKET SEAL (BOSS) SECOND END
•
TUBING WALL NOMINAL THICKNESS FOR WHICH DESIGNED: 0.093 INCHES FIRST END IN
•
NOMINAL OVERALL LENGTH: 3.236 INCHES IN
•
CONNECTION TYPE: UNTHREADED INTERNAL TUBE FIRST END
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS4965 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS
FURNISHED ITEMS AND QUANTITY1 PREFORMED PACKING
CONNECTION STYLEEXTERNAL SEAT FOR GASKET SEAL (BOSS) SECOND END
CONNECTION STYLEPLAIN (TUBE) FIRST END
TUBING WALL NOMINAL THICKNESS FOR WHICH DESIGNED0.093 INCHES FIRST END IN
NOMINAL OVERALL LENGTH3.236 INCHES IN
CONNECTION TYPEUNTHREADED INTERNAL TUBE FIRST END
CONNECTION TYPETHREADED EXTERNAL BOSS SECOND END
MATERIAL DOCUMENT AND CLASSIFICATIONAMS4965 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED1.250 INCHES FIRST END IN
OPERATING PRESSURE4000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
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 5
R45318T4-21Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
07A359-20Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
AP3703T2120Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
AFP1954T2020Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
4PHS129Reference document
Same NSN cross-reference
Reference document — Drawing number reference only
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 4PHS129-20?
4PHS129-20 is a ADAPTER,STRAIGHT,TUBE TO BOSS.
What parts can replace 4PHS129-20?
There are 5 known substitutes for 4PHS129-20: R45318T4-21, 07A359-20, AP3703T2120 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 4PHS129-20?
4PHS129-20 is cataloged in the U.S. Government catalog under NSN 4730-01-367-9966. 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.