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FX3-4IN ✓ Verified by PartsTable
— · HOSE FITTING
WHAT YOU NEED TO KNOW
PTFE tape on tapered threads (NPT/BSPT) JIC/AN flare connections seal metal-to-metal — no tape
NPT != BSPT — look identical, NOT interchangeable
PRODUCT OVERVIEW

The UNION,PIPE TO TUBE is a the manufacturer industrial component. Key specifications include material: STEEL THREAD PIECE, seat_type: GASKETGASKET, connection_type: UNTHREADED INTERNAL TUBE FIRST ENDUNTHREADED INTERNAL TUBE FIRST END, connection_style: PLAIN (PIPE) SECOND ENDPLAIN (PIPE) SECOND END, special_features: DIELECTRIC TYPE W/POLYAMIDE INSULATOR, surface_treatment: ZINC THREAD PIECE. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-349-9959, 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
FX3-4IN
NSN: 4730-00-349-9959
FSC: 4730
CAGE: 16276 — KENCO PRODUCTS CO INC (USA)
SPECIFICATIONS
materialSTEEL THREAD PIECE
seat_typeGASKETGASKET
connection_typeUNTHREADED INTERNAL TUBE FIRST ENDUNTHREADED INTERNAL TUBE FIRST END
connection_stylePLAIN (PIPE) SECOND ENDPLAIN (PIPE) SECOND END
special_featuresDIELECTRIC TYPE W/POLYAMIDE INSULATOR
surface_treatmentZINC THREAD PIECE
operating_pressure250.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
nominal_thread_size0.750 INCHES SECOND END0.750 INCHES SECOND END IN
maximum_operating_temp210.0 FAHRENHEIT SINGLE RESPONSE210.0 FAHRENHEIT SINGLE RESPONSE DEGF
nominal_overall_length2.062 INCHES IN
thread_series_designatorNPT SECOND END
nominal_outside_diameter_tube_accommodated0.750 INCHES FIRST END IN
NSN4730-00-349-9959
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: FX3-4IN · 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
•
MATERIAL: STEEL THREAD PIECECOPPER TAILPIECE
•
CONNECTION TYPE: UNTHREADED INTERNAL TUBE FIRST ENDUNTHREADED INTERNAL TUBE FIRST END
•
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 0.750 INCHES FIRST END IN
•
THREAD SERIES DESIGNATOR: NPT SECOND END
•
NOMINAL OVERALL LENGTH: 2.062 INCHES IN
•
NOMINAL THREAD SIZE: 0.750 INCHES SECOND END0.750 INCHES SECOND END IN
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALSTEEL THREAD PIECECOPPER TAILPIECE
CONNECTION TYPEUNTHREADED INTERNAL TUBE FIRST ENDUNTHREADED INTERNAL TUBE FIRST END
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.750 INCHES FIRST END IN
SPECIAL FEATURESDIELECTRIC TYPE W/POLYAMIDE INSULATOR
THREAD SERIES DESIGNATORNPT SECOND END
NOMINAL OVERALL LENGTH2.062 INCHES IN
NOMINAL THREAD SIZE0.750 INCHES SECOND END0.750 INCHES SECOND END IN
CONNECTION TYPETHREADED INTERNAL PIPE SECOND ENDTHREADED INTERNAL PIPE SECOND END
CONNECTION STYLESOCKET (TUBE) FIRST ENDSOCKET (TUBE) FIRST END
MATERIALSTEEL THREAD PIECE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 14
8512470Interchangeable
interchangeable cross-reference
interchangeable
PA06021132Interchangeable
interchangeable cross-reference
interchangeable
SMC108966Interchangeable
interchangeable cross-reference
interchangeable
FXInterchangeable
interchangeable cross-reference
interchangeable
SW70Interchangeable
interchangeable cross-reference
interchangeable
FX1/2Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is FX3-4IN?
FX3-4IN is a UNION,PIPE TO TUBE.
What parts can replace FX3-4IN?
There are 14 known substitutes for FX3-4IN: 8512470, PA06021132, SMC108966 and 11 more. Substitute compatibility should be verified for your specific system.
What is the NSN for FX3-4IN?
FX3-4IN is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-349-9959. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026