PartsTable
Technical Data Sheet
4321-01 ✓ 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: 2B FIRST END, connection_type: THREADED EXTERNAL BOSS SECOND END, connection_style: EXTERNAL SEAT FOR GASKET SEAL (BOSS) SECOND END, nominal_thread_size: 1.750 INCHES FIRST END IN, nominal_overall_length: 3.625 INCHES IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-086-9953, 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
4321-01
NSN: 4730-01-086-9953
FSC: 4730
CAGE: 89256 — NAVAL SHIP ENGINEERING CENTER PHILADELPHIA DIV (USA)
SPECIFICATIONS
materialSTEEL OVERALL
thread_class2B FIRST END
connection_typeTHREADED EXTERNAL BOSS SECOND END
connection_styleEXTERNAL SEAT FOR GASKET SEAL (BOSS) SECOND END
nominal_thread_size1.750 INCHES FIRST END IN
nominal_overall_length3.625 INCHES IN
thread_quantity_per_inch12 FIRST END
thread_series_designatorUN ALL ENDS
material_document_and_classificationQQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
nominal_outside_diameter_tube_accommodated1.062 INCHES FIRST END IN
NSN4730-01-086-9953
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 4321-01 · 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
THREAD QUANTITY PER INCH: 16 SECOND END
CONNECTION TYPE: THREADED INTERNAL TUBE FIRST END
NOMINAL THREAD SIZE: 1.312 INCHES SECOND END IN
THREAD CLASS: 2A SECOND END A
CONNECTION STYLE: FLARED (TUBE) FIRST END
NOMINAL OVERALL LENGTH: 3.625 INCHES IN
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 1.062 INCHES FIRST END IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD QUANTITY PER INCH16 SECOND END
CONNECTION TYPETHREADED INTERNAL TUBE FIRST END
NOMINAL THREAD SIZE1.312 INCHES SECOND END IN
THREAD QUANTITY PER INCH12 FIRST END
THREAD CLASS2A SECOND END A
CONNECTION STYLEFLARED (TUBE) FIRST END
NOMINAL OVERALL LENGTH3.625 INCHES IN
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED1.062 INCHES FIRST END IN
NOMINAL THREAD SIZE1.750 INCHES FIRST END IN
THREAD CLASS2B FIRST END
VERIFIED SUBSTITUTES & CROSS-REFERENCES 20
PX4173-5Interchangeable
interchangeable cross-reference
interchangeable
9000S6202-74135REV0Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-24558/4Interchangeable
interchangeable cross-reference
interchangeable
4321-0046Interchangeable
interchangeable cross-reference
interchangeable
47507Interchangeable
interchangeable cross-reference
interchangeable
4321Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 4321-01?
4321-01 is a ADAPTER,STRAIGHT,TUBE TO BOSS.
What parts can replace 4321-01?
There are 20 known substitutes for 4321-01: PX4173-5, 9000S6202-74135REV0, MIL-DTL-24558/4 and 17 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 4321-01?
4321-01 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-086-9953. This indicates validated use in U.S. government and defense supply chains.
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