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Technical Data Sheet
PartsTable / COMPONENT / A104-103
A104-103 ✓ 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 INVERTED NUT,TUBE COUPLING is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY, thread_size: 3/8-18, special_features: SOURCE CALLS ITEM A UNION, PIPE; CAN BE USED AS STRAIGHT ADAPTER EXTERNAL PIPE TO INTERNAL TUBE, style_designator: INVERTED NUT, TUBE, FLARE, thread_direction: RIGHT-HAND, width_across_flats: 1.0625 INCHES NOMINAL 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 4730-01-499-5071, 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
A104-103
NSN: 4730-01-499-5071
FSC: 4730
CAGE: 03533 — CRANE CARRIER COMPANY, LLC (USA)
SPECIFICATIONS
materialCOPPER ALLOY
thread_size3/8-18
special_featuresSOURCE CALLS ITEM A UNION, PIPE; CAN BE USED AS STRAIGHT ADAPTER EXTERNAL PIPE TO INTERNAL TUBE
style_designatorINVERTED NUT, TUBE, FLARE
thread_directionRIGHT-HAND
width_across_flats1.0625 INCHES NOMINAL IN
casehardening_indicatorNOT CASEHARDENED
end_item_identificationVEHICLE, TRUCK TRACTOR; 2320-01-452-5579
smallest_inside_diameter0.2188 INCHES NOMINAL IN
screw_thread_series_designatorNPT
tube_outside_diameter_for_which_designed0.250 INCHES NOMINAL IN
NSN4730-01-499-5071
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: A104-103 · 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 DIRECTION: RIGHT-HAND
•
STYLE DESIGNATOR: INVERTED NUT, TUBE, FLARE
•
SMALLEST INSIDE DIAMETER: 0.2188 INCHES NOMINAL IN
•
SCREW THREAD SERIES DESIGNATOR: NPT
•
WIDTH ACROSS FLATS: 1.0625 INCHES NOMINAL IN
•
MATERIAL: COPPER ALLOY
•
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED: 0.250 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD DIRECTIONRIGHT-HAND
STYLE DESIGNATORINVERTED NUT, TUBE, FLARE
SMALLEST INSIDE DIAMETER0.2188 INCHES NOMINAL IN
SPECIAL FEATURESSOURCE CALLS ITEM A UNION, PIPE; CAN BE USED AS STRAIGHT ADAPTER EXTERNAL PIPE TO INTERNAL TUBE
SCREW THREAD SERIES DESIGNATORNPT
WIDTH ACROSS FLATS1.0625 INCHES NOMINAL IN
MATERIALCOPPER ALLOY
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED0.250 INCHES NOMINAL IN
THREAD SIZE3/8-18
CASEHARDENING INDICATORNOT CASEHARDENED
VERIFIED SUBSTITUTES & CROSS-REFERENCES 17
26623FInterchangeable
interchangeable cross-reference
interchangeable
8-32-20-68-017Interchangeable
interchangeable cross-reference
interchangeable
30A527Interchangeable
interchangeable cross-reference
interchangeable
10-4-103Interchangeable
End8yoke
interchangeable
W8118292PC8Interchangeable
interchangeable cross-reference
interchangeable
W8118558PC8Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A104-103?
A104-103 is a INVERTED NUT,TUBE COUPLING.
What parts can replace A104-103?
There are 17 known substitutes for A104-103: 26623F, 8-32-20-68-017, 30A527 and 14 more. Substitute compatibility should be verified for your specific system.
What is the NSN for A104-103?
A104-103 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-499-5071. 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