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1B4328 — FLANGE,PIPE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

1B4328: FLANGE,PIPE.

The FLANGE,PIPE is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING, special_features: MISMATCH .015 MAX., FLASH EXTENSION .030 MAX PERMISSIBLE BUT MUST NO EXCEED FLASH THICKNESS, style_designator: OVAL, ONE BOLT HOLE CIRCLE, bolt_hole_diameter: 0.286 INCHES MAXIMUM IN, bolt_circle_diameter: 0.949 INCHES NOMINAL IN, end_item_identification: ENGINE AIRCRAFT F117, PW-100 (C-17A) A. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-398-5685, 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
1B4328
NSN: 4730-01-398-5685
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 77445 — RTX CORPORATION DBA PRATT & WHITNEY DIV PRATT &WHITNEY (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING
special_featuresMISMATCH .015 MAX., FLASH EXTENSION .030 MAX PERMISSIBLE BUT MUST NO EXCEED FLASH THICKNESS
style_designatorOVAL, ONE BOLT HOLE CIRCLE
bolt_hole_diameter0.286 INCHES MAXIMUM IN
bolt_hole_quantity2
bolt_circle_diameter0.949 INCHES NOMINAL IN
end_item_identificationENGINE AIRCRAFT F117, PW-100 (C-17A) A
material_document_and_classificationAMS5646 ASSN STD SINGLE MATERIAL RESPONSE
NSN4730-01-398-5685
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 1B4328 · 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
•
STYLE DESIGNATOR: OVAL, ONE BOLT HOLE CIRCLE
•
BOLT HOLE DIAMETER: 0.286 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS5646 ASSN STD SINGLE MATERIAL RESPONSE
•
BOLT HOLE QUANTITY: 2
•
BOLT CIRCLE DIAMETER: 0.949 INCHES NOMINAL IN
•
MATERIAL: STEEL CORROSION RESISTING
TECHNICAL CHARACTERISTICS
STYLE DESIGNATOROVAL, ONE BOLT HOLE CIRCLE
BOLT HOLE DIAMETER0.286 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONAMS5646 ASSN STD SINGLE MATERIAL RESPONSE
BOLT HOLE QUANTITY2
BOLT CIRCLE DIAMETER0.949 INCHES NOMINAL IN
SPECIAL FEATURESMISMATCH .015 MAX., FLASH EXTENSION .030 MAX PERMISSIBLE BUT MUST NO EXCEED FLASH THICKNESS
END ITEM IDENTIFICATIONENGINE AIRCRAFT F117, PW-100 (C-17A) A
MATERIALSTEEL CORROSION RESISTING
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

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 1B4328?
1B4328 is a FLANGE,PIPE.
What is the NSN for 1B4328?
1B4328 is cataloged in the U.S. Government catalog under NSN 4730-01-398-5685. 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.