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Technical Data Sheet
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404258 ✓ Verified by PartsTable
3M · 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 ELBOW,FLANGE TO TUBE is a 3M industrial component. Key specifications include material: COPPER ALLOY BODY, special_features: VALVE SIZE 2.000 IN. IN, valve_type_for_which_designed: REGULATOR.

This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-779-7409, 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
404258
NSN: 4730-00-779-7409
FSC: 4730
CAGE: 11449 — TURBO POWER & MARINE SYSTEM INC SUB OF UNITED TECHNOLOGIES CORP (USA)
SPECIFICATIONS
materialCOPPER ALLOY BODY
special_featuresVALVE SIZE 2.000 IN. IN
valve_type_for_which_designedREGULATOR
NSN4730-00-779-7409
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 404258 · 3M ⚠ 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
•
LEG LENGTH: 1.630 INCHES NOMINAL SECOND END IN
•
CONNECTION STYLE: PLAIN (TUBE) FIRST END
•
RAISED FACE NOMINAL DIAMETER: 1.205 INCHES SECOND END IN
•
RAISED FACE NOMINAL HEIGHT: 0.483 INCHES SECOND END IN
•
MATERIAL: STEEL CORROSION RESISTING ELBOW
•
FLOW ANGLE: 82.0 DEGREES
•
SURFACE TREATMENT: PASSIVATE INSIDE
TECHNICAL CHARACTERISTICS (FLIS)
LEG LENGTH1.630 INCHES NOMINAL SECOND END IN
CONNECTION STYLEPLAIN (TUBE) FIRST END
RAISED FACE NOMINAL DIAMETER1.205 INCHES SECOND END IN
RAISED FACE NOMINAL HEIGHT0.483 INCHES SECOND END IN
LEG LENGTH1.968 INCHES NOMINAL FIRST END IN
MATERIALSTEEL CORROSION RESISTING ELBOW
FLOW ANGLE82.0 DEGREES
SURFACE TREATMENTPASSIVATE INSIDE
SURFACE TREATMENTPASSIVATE OUTSIDE
FLANGE FACE DESIGNRAISED STRAIGHT SECOND END
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
40425-8 ITEM 16Interchangeable
interchangeable cross-reference
interchangeable
510-01Interchangeable
interchangeable cross-reference
interchangeable
40425-8Interchangeable
interchangeable cross-reference
interchangeable
40425-802Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 404258?
404258 is a ELBOW,FLANGE TO TUBE manufactured by 3M.
What parts can replace 404258?
There are 4 known substitutes for 404258: 40425-8 ITEM 16, 510-01, 40425-8 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 404258?
404258 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-779-7409. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026