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Technical Data Sheet
PartsTable / COMPONENT / 2125 3-4
2125 3-4 ✓ 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 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, operating_pressure: 3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-222-1863, 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
2125 3-4
NSN: 4730-00-222-1863
FSC: 4730
CAGE: 80996 — ITT GRINNELL CORP (USA)
SPECIFICATIONS
materialSTEEL OVERALL
seat_typeBEVELED
connection_typeTHREADED INTERNAL PIPE ALL ENDS
connection_stylePLAIN (PIPE) ALL ENDS
style_designatorSCREWED
operating_pressure3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
nominal_thread_size0.750 INCHES ALL ENDS IN
coupling_flange_shapeHEXAGON
maximum_operating_temp482.0 CELSIUS SINGLE RESPONSE DEGC
nominal_overall_length2.250 INCHES IN
thread_series_designatorNPT ALL ENDS
NSN4730-00-222-1863
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 2125 3-4 · 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
•
NOMINAL OVERALL LENGTH: 2.250 INCHES IN
•
STYLE DESIGNATOR: SCREWED
•
COUPLING FLANGE SHAPE: HEXAGON
•
NOMINAL THREAD SIZE: 0.750 INCHES ALL ENDS IN
•
THREAD SERIES DESIGNATOR: NPT ALL ENDS
•
OPERATING PRESSURE: 3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
•
SEAT TYPE: BEVELED
•
MATERIAL: STEEL OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
NOMINAL OVERALL LENGTH2.250 INCHES IN
STYLE DESIGNATORSCREWED
COUPLING FLANGE SHAPEHEXAGON
NOMINAL THREAD SIZE0.750 INCHES ALL ENDS IN
THREAD SERIES DESIGNATORNPT ALL ENDS
OPERATING PRESSURE3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
SEAT TYPEBEVELED
MATERIALSTEEL OVERALL
MAXIMUM OPERATING TEMP482.0 CELSIUS SINGLE RESPONSE DEGC
CONNECTION TYPETHREADED INTERNAL PIPE ALL ENDS
VERIFIED SUBSTITUTES & CROSS-REFERENCES 28
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 2125 3-4?
2125 3-4 is a UNION,PIPE.
What parts can replace 2125 3-4?
There are 28 known substitutes for 2125 3-4: XS1V3-4, MILU18182, 2241 and 25 more. Substitute compatibility should be verified for your specific system.
Is 2125 3-4 still available?
2125 3-4 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