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F31-250 — FLANGE,PIPE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

F31-250: FLANGE,PIPE.

The FLANGE,PIPE is a the manufacturer industrial component. Key specifications include material: STEEL, groove_depth: 0.209 INCHES MINIMUM AND 0.229 INCHES MAXIMUM IN, groove_width: 0.177 INCHES MINIMUM AND 0.197 INCHES MAXIMUM IN, flange_diameter: 2.782 INCHES MINIMUM AND 2.788 INCHES MAXIMUM IN, special_features: PINHOLE GUIDE NOT INCLUDED, style_designator: ROUND, NO BOLT HOLES. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-008-8903, 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
F31-250
NSN: 4730-00-008-8903
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 08118 — EATON AVIATION CORPORATION (USA)
SPECIFICATIONS
materialSTEEL
groove_depth0.209 INCHES MINIMUM AND 0.229 INCHES MAXIMUM IN
groove_width0.177 INCHES MINIMUM AND 0.197 INCHES MAXIMUM IN
flange_diameter2.782 INCHES MINIMUM AND 2.788 INCHES MAXIMUM IN
special_featuresPINHOLE GUIDE NOT INCLUDED
style_designatorROUND, NO BOLT HOLES
surface_treatmentPASSIVATE
groove_pitch_diameter2.588 INCHES MINIMUM AND 2.608 INCHES MAXIMUM IN
reducer_flange_hole_typeCONCENTRIC
face_seating_surface_conditionMACHINED
tube_outside_diameter_for_which_designed2.500 INCHES NOMINAL IN
NSN4730-00-008-8903
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: F31-250 · 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
•
FLANGE DIAMETER: 2.782 INCHES MINIMUM AND 2.788 INCHES MAXIMUM IN
•
FACE SEATING SURFACE CONDITION: MACHINED
•
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED: 2.500 INCHES NOMINAL IN
•
STYLE DESIGNATOR: ROUND, NO BOLT HOLES
•
GROOVE DEPTH: 0.209 INCHES MINIMUM AND 0.229 INCHES MAXIMUM IN
•
REDUCER FLANGE HOLE TYPE: CONCENTRIC
•
GROOVE PITCH DIAMETER: 2.588 INCHES MINIMUM AND 2.608 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
FLANGE DIAMETER2.782 INCHES MINIMUM AND 2.788 INCHES MAXIMUM IN
FACE SEATING SURFACE CONDITIONMACHINED
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED2.500 INCHES NOMINAL IN
STYLE DESIGNATORROUND, NO BOLT HOLES
GROOVE DEPTH0.209 INCHES MINIMUM AND 0.229 INCHES MAXIMUM IN
REDUCER FLANGE HOLE TYPECONCENTRIC
GROOVE PITCH DIAMETER2.588 INCHES MINIMUM AND 2.608 INCHES MAXIMUM IN
SPECIAL FEATURESPINHOLE GUIDE NOT INCLUDED
SURFACE TREATMENTPASSIVATE
MATERIALSTEEL
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
F20025CDReference document
Same NSN cross-reference
Reference document — Secondary reference
340-007-9205Reference document
Same NSN cross-reference
Reference document — Vendor item drawing reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Terminal item — stock exhausted; no further procurementNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is F31-250?
F31-250 is a FLANGE,PIPE.
What parts can replace F31-250?
There are 2 known substitutes for F31-250: F20025CD, 340-007-9205. Substitute compatibility should be verified for your specific system.
What is the NSN for F31-250?
F31-250 is cataloged in the U.S. Government catalog under NSN 4730-00-008-8903. 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.