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181790 — CAP,PIPE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

181790: CAP,PIPE.

The CAP,PIPE is a the manufacturer industrial component. Key specifications include material: IRON OVERALL, thread_class: 2B INTERNAL, connection_style: INVERTED FLARE, style_designator: CAP, thread_direction: RIGHT-HAND INTERNAL, nominal_thread_size: 1.375 INCHES INTERNAL IN. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-146-1043, 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
181790
NSN: 4730-00-146-1043
NIINs: 001461043, 014525263
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 82722 — WESTINGHOUSE AIR BRAKE TECHNOLOGIES CORP DBA WESTINGHOUSE AIR BRAKE TECHNOLOGIES CORP (USA)
SPECIFICATIONS
materialIRON OVERALL
thread_class2B INTERNAL
connection_styleINVERTED FLARE
style_designatorCAP
thread_directionRIGHT-HAND INTERNAL
nominal_thread_size1.375 INCHES INTERNAL IN
thread_pitch_diameters+1.3070 TO 1.3158 INCHES INTERNAL IN
thread_quantity_per_inch16 INTERNAL
thread_series_designatorUN INTERNAL
nominal_pipe_size_for_which_designed1.063 INCHES IN
NSN4730-00-146-1043
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 181790 · 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
•
NOMINAL PIPE SIZE FOR WHICH DESIGNED: 1.063 INCHES IN
•
CONNECTION STYLE: INVERTED FLARE
•
STYLE DESIGNATOR: CAP
•
THREAD PITCH DIAMETERS: +1.3070 TO 1.3158 INCHES INTERNAL IN
•
THREAD DIRECTION: RIGHT-HAND INTERNAL
•
NOMINAL THREAD SIZE: 1.375 INCHES INTERNAL IN
•
THREAD CLASS: 2B INTERNAL
•
THREAD QUANTITY PER INCH: 16 INTERNAL
TECHNICAL CHARACTERISTICS
NOMINAL PIPE SIZE FOR WHICH DESIGNED1.063 INCHES IN
CONNECTION STYLEINVERTED FLARE
STYLE DESIGNATORCAP
THREAD PITCH DIAMETERS+1.3070 TO 1.3158 INCHES INTERNAL IN
THREAD DIRECTIONRIGHT-HAND INTERNAL
NOMINAL THREAD SIZE1.375 INCHES INTERNAL IN
THREAD CLASS2B INTERNAL
THREAD QUANTITY PER INCH16 INTERNAL
MATERIALIRON OVERALL
THREAD SERIES DESIGNATORUN INTERNAL
SUBSTITUTES & CROSS-REFERENCES 2
X1019E1PC40Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
185760Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Semi-active item — no replacement plannedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 181790?
181790 is a CAP,PIPE.
What parts can replace 181790?
There are 2 known substitutes for 181790: X1019E1PC40, 185760. Substitute compatibility should be verified for your specific system.
What is the NSN for 181790?
181790 is cataloged in the U.S. Government catalog under NSN 4730-00-146-1043. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.