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PartsTable / COMPONENT / 181D1-4
181D1-4 ✓ 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, seat_radius: 0.219 INCHES NOMINAL IN, thread_size: 7/16-24, thread_class: 2B, overall_length: 0.563 INCHES NOMINAL IN, style_designator: INVERTED NUT, TUBE, COMPRESSION. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-142-1593, 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
181D1-4
NSN: 4730-00-142-1593
FSC: 4730
CAGE: 30327 — IMPERIAL (USA)
SPECIFICATIONS
materialCOPPER ALLOY
seat_radius0.219 INCHES NOMINAL IN
thread_size7/16-24
thread_class2B
overall_length0.563 INCHES NOMINAL IN
style_designatorINVERTED NUT, TUBE, COMPRESSION
thread_directionRIGHT-HAND
width_across_flats0.438 INCHES NOMINAL IN
casehardening_indicatorNOT CASEHARDENED
end_item_identificationGRUMMAN A-10 AIRCRAFT
smallest_inside_diameter0.253 INCHES NOMINAL IN
screw_thread_series_designatorUNS
NSN4730-00-142-1593
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 181D1-4 · 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
•
MATERIAL: COPPER ALLOY
•
SMALLEST INSIDE DIAMETER: 0.253 INCHES NOMINAL IN
•
SCREW THREAD SERIES DESIGNATOR: UNS
•
WIDTH ACROSS FLATS: 0.438 INCHES NOMINAL IN
•
SEAT RADIUS: 0.219 INCHES NOMINAL IN
•
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED: 0.250 INCHES NOMINAL IN
•
STYLE DESIGNATOR: INVERTED NUT, TUBE, COMPRESSION
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALCOPPER ALLOY
OVERALL LENGTH0.563 INCHES NOMINAL IN
SMALLEST INSIDE DIAMETER0.253 INCHES NOMINAL IN
SCREW THREAD SERIES DESIGNATORUNS
WIDTH ACROSS FLATS0.438 INCHES NOMINAL IN
SEAT RADIUS0.219 INCHES NOMINAL IN
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED0.250 INCHES NOMINAL IN
STYLE DESIGNATORINVERTED NUT, TUBE, COMPRESSION
THREAD SIZE7/16-24
END ITEM IDENTIFICATIONGRUMMAN A-10 AIRCRAFT
VERIFIED SUBSTITUTES & CROSS-REFERENCES 23
P0111Interchangeable
interchangeable cross-reference
interchangeable
P0111-1AMP 110VAC-60HZInterchangeable
interchangeable cross-reference
interchangeable
M27Interchangeable
interchangeable cross-reference
interchangeable
WC415Interchangeable
interchangeable cross-reference
interchangeable
001449Interchangeable
interchangeable cross-reference
interchangeable
464-0241-001Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 181D1-4?
181D1-4 is a INVERTED NUT,TUBE COUPLING.
What parts can replace 181D1-4?
There are 23 known substitutes for 181D1-4: P0111, P0111-1AMP 110VAC-60HZ, M27 and 20 more. Substitute compatibility should be verified for your specific system.
Is 181D1-4 still available?
181D1-4 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026