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3258421-2 — EXPANSION JOINT,PIPE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

3258421-2: EXPANSION JOINT,PIPE.

The EXPANSION JOINT,PIPE is a the manufacturer industrial component. Key specifications include material: STEEL FLANGE, overall_length: 4.500 INCHES NOMINAL IN, surface_treatment: CADMIUM FLANGE, end_connection_type: FLANGED, bolt_circle_diameter: 5.500 INCHES NOMINAL IN, flange_outside_diameter: 7.000 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-274-0804, 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
3258421-2
NSN: 4730-01-274-0804
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
materialSTEEL FLANGE
overall_length4.500 INCHES NOMINAL IN
surface_treatmentCADMIUM FLANGE
bolt_hole_quantity4
end_connection_typeFLANGED
bolt_circle_diameter5.500 INCHES NOMINAL IN
flange_outside_diameter7.000 INCHES NOMINAL IN
working_pressure_rating225.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS
nominal_pipe_size_designation2.500 INCHES IN
screw_thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
NSN4730-01-274-0804
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 3258421-2 · 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 DESIGNATION: 2.500 INCHES IN
•
END CONNECTION TYPE: FLANGED
•
WORKING PRESSURE RATING: 225.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS
•
BOLT HOLE QUANTITY: 4
•
BOLT CIRCLE DIAMETER: 5.500 INCHES NOMINAL IN
•
SCREW THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
SURFACE TREATMENT: CADMIUM FLANGE
TECHNICAL CHARACTERISTICS
NOMINAL PIPE SIZE DESIGNATION2.500 INCHES IN
END CONNECTION TYPEFLANGED
OVERALL LENGTH4.500 INCHES NOMINAL IN
WORKING PRESSURE RATING225.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS
BOLT HOLE QUANTITY4
BOLT CIRCLE DIAMETER5.500 INCHES NOMINAL IN
SCREW THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
SURFACE TREATMENTCADMIUM FLANGE
MATERIALSTEEL FLANGE
FLANGE OUTSIDE DIAMETER7.000 INCHES NOMINAL IN
OTHER ITEMS IN FSC 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4730-00-000-1895 4730-00-000-4289 4730-00-000-4445 4730-00-000-8373 4730-00-000-8897 4730-00-001-0007 4730-00-001-0008
SUBSTITUTES & CROSS-REFERENCES 2
METRASPHERE 2-1/2IN-OUNReference document
Same NSN cross-reference
Reference document — Secondary reference
MSOPP0250Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Shelf-life managedAcquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 3258421-2?
3258421-2 is a EXPANSION JOINT,PIPE.
What parts can replace 3258421-2?
There are 2 known substitutes for 3258421-2: METRASPHERE 2-1/2IN-OUN, MSOPP0250. Substitute compatibility should be verified for your specific system.
What is the NSN for 3258421-2?
3258421-2 is cataloged in the U.S. Government catalog under NSN 4730-01-274-0804. 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.