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Technical Data Sheet
PartsTable / COMPONENT / 3666-109-23
3666-109-23 ✓ 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,COUPLING is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-148-2546, 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
3666-109-23
NSN: 4730-01-148-2546
FSC: 4730
CAGE: 13859 — KING NUTRONICS CORPORATION DBA KING NUTRONICS (USA)
SPECIFICATIONS
Part Number3666-109-23
NSN4730-01-148-2546
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 3666-109-23 · 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
626-320Interchangeable
interchangeable cross-reference
interchangeable
3666-109-15Interchangeable
interchangeable cross-reference
interchangeable
3666-109-1Interchangeable
interchangeable cross-reference
interchangeable
409-364Interchangeable
interchangeable cross-reference
interchangeable
3666-109Interchangeable
interchangeable cross-reference
interchangeable
3666-109-21Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 3666-109-23?
3666-109-23 is a ADAPTER,COUPLING.
What parts can replace 3666-109-23?
There are 9 known substitutes for 3666-109-23: 626-320, 3666-109-15, 3666-109-1 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 3666-109-23?
3666-109-23 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-148-2546. 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