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Technical Data Sheet
PartsTable / COMPONENT / 4FNU-S
4FNU-S ✓ 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 ADAPTER,STRAIGHT,PIPE TO TUBE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, seat_angle: 20.0 DEGREES, thread_class: 2B INTERNAL, connection_style: PRESSURE SEAL FLARELESS, style_designator: CAP, TUBE, FLARELESS, thread_direction: RIGHT-HAND INTERNAL. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-727-7480, 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
4FNU-S
NSN: 4730-00-727-7480
FSC: 4730
CAGE: 30780 — PARKER-HANNIFIN CORPORATION DBA PNEUTRONICS DIV TUBE FITTINGS DIVISION (USA)
SPECIFICATIONS
materialSTEEL OVERALL
seat_angle20.0 DEGREES
thread_class2B INTERNAL
connection_stylePRESSURE SEAL FLARELESS
style_designatorCAP, TUBE, FLARELESS
thread_directionRIGHT-HAND INTERNAL
nominal_thread_size0.438 INCHES INTERNAL IN
seat_nominal_radius0.0225 INCHES IN
end_item_identificationGRUMMAN AEROSPACE CORP A10A AIRCRAFT
thread_series_designatorUNF INTERNAL
nondefinitive_spec/std_data32 FIGURE
specification/standard_data96906-MS51890 GOVERNMENT STANDARD AND 81343-J514 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD AND 81349-MIL-F-18866 GOVERNMENT SPECIFICATION
NSN4730-00-727-7480
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 4FNU-S · 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
•
STYLE DESIGNATOR: CAP, TUBE, FLARELESS
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: J514 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-624 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
THREAD DIRECTION: RIGHT-HAND INTERNAL
•
NOMINAL THREAD SIZE: 0.438 INCHES INTERNAL IN
•
NONDEFINITIVE SPEC/STD DATA: 32 FIGURE
•
THREAD CLASS: 2B INTERNAL
•
MATERIAL: STEEL OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
STYLE DESIGNATORCAP, TUBE, FLARELESS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONJ514 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-624 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
THREAD DIRECTIONRIGHT-HAND INTERNAL
NOMINAL THREAD SIZE0.438 INCHES INTERNAL IN
NONDEFINITIVE SPEC/STD DATA32 FIGURE
THREAD CLASS2B INTERNAL
MATERIALSTEEL OVERALL
END ITEM IDENTIFICATIONGRUMMAN AEROSPACE CORP A10A AIRCRAFT
CONNECTION STYLEPRESSURE SEAL FLARELESS
VERIFIED SUBSTITUTES & CROSS-REFERENCES 14
10458723Interchangeable
interchangeable cross-reference
interchangeable
69-55718-1Interchangeable
interchangeable cross-reference
interchangeable
3112484Interchangeable
interchangeable cross-reference
interchangeable
4FNUSInterchangeable
interchangeable cross-reference
interchangeable
B2808-67Interchangeable
interchangeable cross-reference
interchangeable
J514Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 4FNU-S?
4FNU-S is a ADAPTER,STRAIGHT,PIPE TO TUBE.
What parts can replace 4FNU-S?
There are 14 known substitutes for 4FNU-S: 10458723, 69-55718-1, 3112484 and 11 more. Substitute compatibility should be verified for your specific system.
Is 4FNU-S still available?
4FNU-S is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026