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Technical Data Sheet
PartsTable / COMPONENT / 1655791-4
1655791-4 ✓ 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 TEE,PIPE TO TUBE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, leg_length: 1.219 INCHES NOMINAL SECOND END1.219 INCHES NOMINAL SECOND END IN, thread_class: 2A THIRD END2A THIRD END A, connection_type: THREADED EXTERNAL TUBE FIRST ENDTHREADED EXTERNAL TUBE FIRST END, connection_style: GASKET SEAL, COMPRESSION (TUBE) FIRST ENDGASKET SEAL, COMPRESSION (TUBE) FIRST END, surface_treatment: CADMIUM 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 4730-00-411-5572, 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
1655791-4
NSN: 4730-00-411-5572
FSC: 4730
CAGE: 10001 — NAVAIR AND NAVSEA MANAGED ORIGINAL DESIGN ACTIVITY DWG NOT MATERIAL/PARTS SUPPLIER (USA)
SPECIFICATIONS
materialSTEEL OVERALL
leg_length1.219 INCHES NOMINAL SECOND END1.219 INCHES NOMINAL SECOND END IN
thread_class2A THIRD END2A THIRD END A
connection_typeTHREADED EXTERNAL TUBE FIRST ENDTHREADED EXTERNAL TUBE FIRST END
connection_styleGASKET SEAL, COMPRESSION (TUBE) FIRST ENDGASKET SEAL, COMPRESSION (TUBE) FIRST END
surface_treatmentCADMIUM OVERALL
operating_pressure2500.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
nominal_thread_size0.375 INCHES SECOND END0.375 INCHES SECOND END IN
maximum_operating_temp135.0 CELSIUS SINGLE RESPONSE135.0 CELSIUS SINGLE RESPONSE DEGC
thread_series_designatorUNF THIRD ENDNPTF SECOND END
furnished_items_and_quantity2 PREFORMED PACKING AND 2 SHORT COUPLING NUT AND 2 SPLIT COLLET SLEEVE AND 2 FLAT WASHER
nominal_outside_diameter_tube_accommodated0.500 INCHES THIRD END0.500 INCHES FIRST END IN
NSN4730-00-411-5572
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 1655791-4 · 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
•
CONNECTION TYPE: THREADED EXTERNAL PIPE SECOND ENDTHREADED EXTERNAL PIPE SECOND END
•
MAXIMUM OPERATING TEMP: 135.0 CELSIUS SINGLE RESPONSE135.0 CELSIUS SINGLE RESPONSE DEGC
•
SURFACE TREATMENT: CADMIUM OVERALL
•
LEG LENGTH: 1.219 INCHES NOMINAL SECOND END1.219 INCHES NOMINAL SECOND END IN
•
CONNECTION STYLE: GASKET SEAL, COMPRESSION (TUBE) THIRD ENDGASKET SEAL, COMPRESSION (TUBE) THIRD END
•
THREAD CLASS: 2A THIRD END2A THIRD END A
•
MATERIAL: STEEL OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
CONNECTION TYPETHREADED EXTERNAL PIPE SECOND ENDTHREADED EXTERNAL PIPE SECOND END
MAXIMUM OPERATING TEMP135.0 CELSIUS SINGLE RESPONSE135.0 CELSIUS SINGLE RESPONSE DEGC
SURFACE TREATMENTCADMIUM OVERALL
LEG LENGTH1.219 INCHES NOMINAL SECOND END1.219 INCHES NOMINAL SECOND END IN
CONNECTION STYLEGASKET SEAL, COMPRESSION (TUBE) THIRD ENDGASKET SEAL, COMPRESSION (TUBE) THIRD END
THREAD CLASS2A THIRD END2A THIRD END A
MATERIALSTEEL OVERALL
CONNECTION STYLEPLAIN (PIPE) SECOND ENDPLAIN (PIPE) SECOND END
CONNECTION TYPETHREADED EXTERNAL TUBE THIRD ENDTHREADED EXTERNAL TUBE THIRD END
FURNISHED ITEMS AND QUANTITY2 PREFORMED PACKING AND 2 SHORT COUPLING NUT AND 2 SPLIT COLLET SLEEVE AND 2 FLAT WASHER
VERIFIED SUBSTITUTES & CROSS-REFERENCES 17
750-8Interchangeable
interchangeable cross-reference
interchangeable
Y75-8Interchangeable
interchangeable cross-reference
interchangeable
3420-8Interchangeable
interchangeable cross-reference
interchangeable
010-004988Interchangeable
interchangeable cross-reference
interchangeable
7208Interchangeable
interchangeable cross-reference
interchangeable
6208ZInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1655791-4?
1655791-4 is a TEE,PIPE TO TUBE.
What parts can replace 1655791-4?
There are 17 known substitutes for 1655791-4: 750-8, Y75-8, 3420-8 and 14 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1655791-4?
1655791-4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-411-5572. 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