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PartsTable / COMPONENT / M18182-31U
M18182-31U ✓ 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 UNION,PIPE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, seat_type: BEVELED, connection_type: THREADED INTERNAL PIPE ALL ENDS, connection_style: PLAIN (PIPE) ALL ENDS, style_designator: SCREWED, surface_treatment: CADMIUM NUT. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-277-8657, 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
M18182-31U
NSN: 4730-00-277-8657
FSC: 4730
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL OVERALL
seat_typeBEVELED
connection_typeTHREADED INTERNAL PIPE ALL ENDS
connection_stylePLAIN (PIPE) ALL ENDS
style_designatorSCREWED
surface_treatmentCADMIUM NUT
operating_pressure3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
nominal_thread_size2.000 INCHES ALL ENDS IN
nominal_overall_length3.437 INCHES IN
media_for_which_designedWATER-OIL-GAS SINGLE RESPONSE
thread_series_designatorNPT ALL ENDS
nondefinitive_spec/std_data2 CLASS AND A STYLE
NSN4730-00-277-8657
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: M18182-31U · 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: STEEL OVERALL
•
STYLE DESIGNATOR: SCREWED
•
THREAD SERIES DESIGNATOR: NPT ALL ENDS
•
MEDIA FOR WHICH DESIGNED: WATER-OIL-GAS SINGLE RESPONSE
•
NOMINAL THREAD SIZE: 2.000 INCHES ALL ENDS IN
•
NOMINAL OVERALL LENGTH: 3.437 INCHES IN
•
OPERATING PRESSURE: 3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
•
NONDEFINITIVE SPEC/STD DATA: 2 CLASS AND A STYLE
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALSTEEL OVERALL
STYLE DESIGNATORSCREWED
THREAD SERIES DESIGNATORNPT ALL ENDS
MEDIA FOR WHICH DESIGNEDWATER-OIL-GAS SINGLE RESPONSE
NOMINAL THREAD SIZE2.000 INCHES ALL ENDS IN
NOMINAL OVERALL LENGTH3.437 INCHES IN
OPERATING PRESSURE3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
NONDEFINITIVE SPEC/STD DATA2 CLASS AND A STYLE
SPECIFICATION/STANDARD DATA81349-MIL-U-18182/CANCELED GOVERNMENT SPECIFICATION
SURFACE TREATMENTCADMIUM NUT
VERIFIED SUBSTITUTES & CROSS-REFERENCES 24
XS1V3-4Interchangeable
interchangeable cross-reference
interchangeable
MILU18182Interchangeable
interchangeable cross-reference
interchangeable
2241Interchangeable
interchangeable cross-reference
interchangeable
5720 1-4Interchangeable
interchangeable cross-reference
interchangeable
5720Interchangeable
interchangeable cross-reference
interchangeable
3250X4Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is M18182-31U?
M18182-31U is a UNION,PIPE.
What parts can replace M18182-31U?
There are 24 known substitutes for M18182-31U: XS1V3-4, MILU18182, 2241 and 21 more. Substitute compatibility should be verified for your specific system.
Is M18182-31U still available?
M18182-31U 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