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Technical Data Sheet
PartsTable / COMPONENT / 4-6FBU-SS
4-6FBU-SS ✓ 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 COMP 302 OR STEEL COMP 347 OVERALL, seat_angle: 12.0 DEGREES FIRST END, thread_class: 2A FIRST END A, connection_type: THREADED EXTERNAL TUBE FIRST END, connection_style: FLARELESS (TUBE) FIRST END, surface_treatment: PASSIVATE OVERALL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-091-8031, 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
4-6FBU-SS
NSN: 4730-01-091-8031
FSC: 4730
CAGE: 98441 — PARKER HANNIFIN CORP DBA PNEUTRONICS DIV STRATOFLEX PRODUCTS DIVISION (USA)
SPECIFICATIONS
materialSTEEL COMP 302 OR STEEL COMP 347 OVERALL
seat_angle12.0 DEGREES FIRST END
thread_class2A FIRST END A
connection_typeTHREADED EXTERNAL TUBE FIRST END
connection_styleFLARELESS (TUBE) FIRST END
surface_treatmentPASSIVATE OVERALL
nominal_thread_size0.375 INCHES SECOND END IN
maximum_operating_temp250.0 FAHRENHEIT FIRST RESPONSE DEGF
nominal_overall_length33.8 MILLIMETERS MM
thread_series_designatorUNF FIRST END
nondefinitive_spec/std_data2 CLASS AND 1 TYPE AND 1 STYLE
specification/standard_data81349-MIL-F-18866 GOVERNMENT SPECIFICATION AND 81343-SAE080102 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD AND 81343-J514 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
NSN4730-01-091-8031
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 4-6FBU-SS · 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 COMP 302 OR STEEL COMP 347 OVERALL
•
NOMINAL THREAD SIZE: 0.375 INCHES SECOND END IN
•
FURNISHED ITEMS AND QUANTITY: 1 TUBE COUPLING NUT W/SLEEVE
•
SPECIFICATION/STANDARD DATA: 81349-MIL-F-18866 GOVERNMENT SPECIFICATION AND 81343-SAE080102 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD AND 81343-J514 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
•
CONNECTION TYPE: THREADED EXTERNAL PIPE SECOND END
•
NONDEFINITIVE SPEC/STD DATA: 2 CLASS AND 1 TYPE AND 1 STYLE
•
MAXIMUM OPERATING TEMP: 250.0 FAHRENHEIT SECOND RESPONSE DEGF
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALSTEEL COMP 302 OR STEEL COMP 347 OVERALL
NOMINAL THREAD SIZE0.375 INCHES SECOND END IN
FURNISHED ITEMS AND QUANTITY1 TUBE COUPLING NUT W/SLEEVE
SPECIFICATION/STANDARD DATA81349-MIL-F-18866 GOVERNMENT SPECIFICATION AND 81343-SAE080102 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD AND 81343-J514 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
CONNECTION TYPETHREADED EXTERNAL PIPE SECOND END
NONDEFINITIVE SPEC/STD DATA2 CLASS AND 1 TYPE AND 1 STYLE
NOMINAL THREAD SIZE0.438 INCHES FIRST END IN
MAXIMUM OPERATING TEMP250.0 FAHRENHEIT SECOND RESPONSE DEGF
SURFACE TREATMENTPASSIVATE OVERALL
CONNECTION STYLEFLARELESS (TUBE) FIRST END
VERIFIED SUBSTITUTES & CROSS-REFERENCES 29
6138952-46Interchangeable
interchangeable cross-reference
interchangeable
MS51504A8-12SInterchangeable
interchangeable cross-reference
interchangeable
6138952-111Interchangeable
interchangeable cross-reference
interchangeable
6138952Interchangeable
interchangeable cross-reference
interchangeable
926320Interchangeable
interchangeable cross-reference
interchangeable
3010606-6-6-6C-60.00Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 4-6FBU-SS?
4-6FBU-SS is a ADAPTER,STRAIGHT,PIPE TO TUBE.
What parts can replace 4-6FBU-SS?
There are 29 known substitutes for 4-6FBU-SS: 6138952-46, MS51504A8-12S, 6138952-111 and 26 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 4-6FBU-SS?
4-6FBU-SS is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-091-8031. This indicates validated use in U.S. government and defense supply chains.
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PartsTable Design LLC · partstable.com
Last verified: July 2026