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1655831 ✓ 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,TUBE TO BOSS is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, thread_class: 2A FIRST END A, connection_type: THREADED EXTERNAL TUBE FIRST END, connection_style: GASKET SEAL, COMPRESSION (TUBE) FIRST END, surface_treatment: CADMIUM OVERALL, operating_pressure: 2500.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-411-5579, 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
1655831
NSN: 4730-00-411-5579
FSC: 4730
CAGE: 10001 — NAVAIR AND NAVSEA MANAGED ORIGINAL DESIGN ACTIVITY DWG NOT MATERIAL/PARTS SUPPLIER (USA)
SPECIFICATIONS
materialSTEEL OVERALL
thread_class2A FIRST END A
connection_typeTHREADED EXTERNAL TUBE FIRST END
connection_styleGASKET SEAL, COMPRESSION (TUBE) FIRST END
surface_treatmentCADMIUM OVERALL
operating_pressure2500.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
nominal_thread_size0.750 INCHES FIRST END IN
maximum_operating_temp275.0 FAHRENHEIT SINGLE RESPONSE DEGF
nominal_overall_length1.688 INCHES IN
thread_series_designatorUNF FIRST END
furnished_items_and_quantity1 LOCKNUT AND 2 PREFORMED PACKING AND 1 SHORT COUPLING NUT AND 1 SPLIT COLLET SLEEVE AND 1 FLAT WASHER
nominal_outside_diameter_tube_accommodated0.500 INCHES FIRST END IN
NSN4730-00-411-5579
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 1655831 · 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 BOSS SECOND END
•
SURFACE TREATMENT: CADMIUM OVERALL
•
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 0.500 INCHES FIRST END IN
•
NOMINAL OVERALL LENGTH: 1.688 INCHES IN
•
FURNISHED ITEMS AND QUANTITY: 1 LOCKNUT AND 2 PREFORMED PACKING AND 1 SHORT COUPLING NUT AND 1 SPLIT COLLET SLEEVE AND 1 FLAT WASHER
•
OPERATING PRESSURE: 2500.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
•
MATERIAL: STEEL OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
CONNECTION TYPETHREADED EXTERNAL BOSS SECOND END
SURFACE TREATMENTCADMIUM OVERALL
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.500 INCHES FIRST END IN
NOMINAL OVERALL LENGTH1.688 INCHES IN
CONNECTION TYPETHREADED EXTERNAL TUBE FIRST END
FURNISHED ITEMS AND QUANTITY1 LOCKNUT AND 2 PREFORMED PACKING AND 1 SHORT COUPLING NUT AND 1 SPLIT COLLET SLEEVE AND 1 FLAT WASHER
OPERATING PRESSURE2500.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
MATERIALSTEEL OVERALL
NOMINAL THREAD SIZE0.750 INCHES FIRST END IN
THREAD SERIES DESIGNATORUNF FIRST END
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
A1008Interchangeable
interchangeable cross-reference
interchangeable
A2216Interchangeable
interchangeable cross-reference
interchangeable
BP4909Interchangeable
interchangeable cross-reference
interchangeable
2073G1Interchangeable
interchangeable cross-reference
interchangeable
1080H43REVPPC48Interchangeable
interchangeable cross-reference
interchangeable
GPW2598Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1655831?
1655831 is a ADAPTER,STRAIGHT,TUBE TO BOSS.
What parts can replace 1655831?
There are 11 known substitutes for 1655831: A1008, A2216, BP4909 and 8 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1655831?
1655831 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-411-5579. 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