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5-4 FBU-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

ADAPTER,STRAIGHT,TUBE TO GAS FIT. Key specifications include material: STEEL BODY, connection_type: THREADED EXTERNAL TUBE FIRST END, style_designator: CENTER WRENCHING FACILITY, operating_pressure: 6000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS, nominal_thread_size: 0.250 INCHES SECOND END IN, thread_quantity_per_inch: 18 SECOND END. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-913-9737, 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
5-4 FBU-S
NSN: 4730-00-913-9737
FSC: 4730
CAGE: 98441 — PARKER HANNIFIN CORP DBA PNEUTRONICS DIV STRATOFLEX PRODUCTS DIVISION (USA)
SPECIFICATIONS
materialSTEEL BODY
connection_typeTHREADED EXTERNAL TUBE FIRST END
style_designatorCENTER WRENCHING FACILITY
operating_pressure6000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
nominal_thread_size0.250 INCHES SECOND END IN
thread_quantity_per_inch18 SECOND END
thread_series_designatorNPTF SECOND END
part_name_assigned_by_controlling_agencyFLARELESS 24 DEGREE BITE-TYPE FITTING
nominal_outside_diameter_tube_accommodated0.312 INCHES FIRST END IN
NSN4730-00-913-9737
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 5-4 FBU-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
•
FURNISHED ITEMS AND QUANTITY: 1 TUBE COUPLING NUT W/SLEEVE
•
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 0.312 INCHES FIRST END IN
•
THREAD SERIES DESIGNATOR: NPTF SECOND END
•
MAXIMUM OPERATING TEMP: 400.0 FAHRENHEIT SINGLE RESPONSE DEGF
•
SPECIFICATION/STANDARD DATA: 81349 - MIL-F-18866 GOVERNMENT SPECIFICATION
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: J514 ASSN STD SINGLE TREATMENT RESPONSE AND QQ-P-416, TY 2, CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
NOMINAL THREAD SIZE: 0.250 INCHES SECOND END IN
TECHNICAL CHARACTERISTICS (FLIS)
FURNISHED ITEMS AND QUANTITY1 TUBE COUPLING NUT W/SLEEVE
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.312 INCHES FIRST END IN
THREAD SERIES DESIGNATORNPTF SECOND END
MAXIMUM OPERATING TEMP400.0 FAHRENHEIT SINGLE RESPONSE DEGF
SPECIFICATION/STANDARD DATA81349 - MIL-F-18866 GOVERNMENT SPECIFICATION
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONJ514 ASSN STD SINGLE TREATMENT RESPONSE AND QQ-P-416, TY 2, CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD SERIES DESIGNATORUNF FIRST END
NOMINAL THREAD SIZE0.250 INCHES SECOND END IN
THREAD CLASS2A FIRST END A
CONNECTION TYPETHREADED EXTERNAL TUBE FIRST END
VERIFIED SUBSTITUTES & CROSS-REFERENCES 17
F505Interchangeable
interchangeable cross-reference
interchangeable
100001-1025Interchangeable
interchangeable cross-reference
interchangeable
WEE10Interchangeable
interchangeable cross-reference
interchangeable
402C-5Interchangeable
interchangeable cross-reference
interchangeable
B94.19 TABLE 29Interchangeable
interchangeable cross-reference
interchangeable
505Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 5-4 FBU-S?
5-4 FBU-S is a ADAPTER,STRAIGHT,TUBE TO GAS FIT.
What parts can replace 5-4 FBU-S?
There are 17 known substitutes for 5-4 FBU-S: F505, 100001-1025, WEE10 and 14 more. Substitute compatibility should be verified for your specific system.
Is 5-4 FBU-S still available?
5-4 FBU-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