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Technical Data Sheet
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X12339 ✓ 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 CIRCUIT CARD ASSEMBLY is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY, special_features: 0.750 IN.MIN,1.062 IN.MAX LG O/A;EXTERNAL PIPE THD LG,0.590 IN.;INTERNAL PIPE THD LG,0.625 IN. IN, style_designator: OUTSIDE HEXAGON OR OCTAGON (PARTIAL OR FULL THREAD OPTIONAL), external_thread_size: 3/8-18, internal_thread_size: 1/4-18, external_thread_direction: RIGHT-HAND.

This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-618-7038, 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
X12339
NSN: 4730-00-618-7038
FSC: 4730
CAGE: 18990 — EAGLE CRUSHER CO INC DBA STEDMAN MACHINE CO (USA)
SPECIFICATIONS
materialCOPPER ALLOY
special_features0.750 IN.MIN,1.062 IN.MAX LG O/A;EXTERNAL PIPE THD LG,0.590 IN.;INTERNAL PIPE THD LG,0.625 IN. IN
style_designatorOUTSIDE HEXAGON OR OCTAGON (PARTIAL OR FULL THREAD OPTIONAL)
external_thread_size3/8-18
internal_thread_size1/4-18
external_thread_directionRIGHT-HAND
internal_thread_directionRIGHT-HAND
external_screw_thread_series_designatorNPT
internal_screw_thread_series_designatorNPT
NSN4730-00-618-7038
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: X12339 · 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
•
INTERNAL THREAD DIRECTION: RIGHT-HAND
•
EXTERNAL SCREW THREAD SERIES DESIGNATOR: NPT
•
EXTERNAL THREAD DIRECTION: RIGHT-HAND
•
INTERNAL SCREW THREAD SERIES DESIGNATOR: NPT
•
STYLE DESIGNATOR: OUTSIDE HEXAGON OR OCTAGON (PARTIAL OR FULL THREAD OPTIONAL)
•
MATERIAL: COPPER ALLOY
•
INTERNAL THREAD SIZE: 1/4-18
TECHNICAL CHARACTERISTICS (FLIS)
SPECIAL FEATURES0.750 IN.MIN,1.062 IN.MAX LG O/A;EXTERNAL PIPE THD LG,0.590 IN.;INTERNAL PIPE THD LG,0.625 IN. IN
INTERNAL THREAD DIRECTIONRIGHT-HAND
EXTERNAL SCREW THREAD SERIES DESIGNATORNPT
EXTERNAL THREAD DIRECTIONRIGHT-HAND
INTERNAL SCREW THREAD SERIES DESIGNATORNPT
STYLE DESIGNATOROUTSIDE HEXAGON OR OCTAGON (PARTIAL OR FULL THREAD OPTIONAL)
MATERIALCOPPER ALLOY
INTERNAL THREAD SIZE1/4-18
EXTERNAL THREAD SIZE3/8-18
WORKING PRESSURE AND SERVICE TYPE125.0 POUNDS PER SQUARE INCH (PSI) NOMINAL STEAM AND 175.0 POUNDS PER SQUARE INCH (PSI) NOMINAL WATER AND 175.0 POUNDS PER SQUARE INCH (PSI) NOMINAL OIL AND 175.0 POUNDS PER SQUARE INCH (PSI) NOMINAL GAS LBS
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
28023Interchangeable
interchangeable cross-reference
interchangeable
AA51146B-1A5BInterchangeable
interchangeable cross-reference
interchangeable
33.026Interchangeable
interchangeable cross-reference
interchangeable
50489Interchangeable
interchangeable cross-reference
interchangeable
34531Interchangeable
interchangeable cross-reference
interchangeable
RC0709Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is X12339?
X12339 is a CIRCUIT CARD ASSEMBLY.
What parts can replace X12339?
There are 12 known substitutes for X12339: 28023, AA51146B-1A5B, 33.026 and 9 more. Substitute compatibility should be verified for your specific system.
What is the NSN for X12339?
X12339 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-618-7038. 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