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Technical Data Sheet
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342521 — FLANGE,PIPE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

342521: FLANGE,PIPE.

The FLANGE,PIPE is a the manufacturer industrial component. Key specifications include nondefinitive_spec/std_data: 5 CLASS, criticality_code_justification: ZZZT. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-571-0581, 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
342521
NSN: 4730-00-571-0581
NIINs: 005710581, 017268018
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 98897 — LOCKHEED MARTIN CORP (USA)
SPECIFICATIONS
nondefinitive_spec/std_data5 CLASS
criticality_code_justificationZZZT
NSN4730-00-571-0581
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 342521 · 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: 2.620 INCHES NOMINAL IN
•
FLANGE SECTION STYLE: PLAIN FACE, LONG NECK
•
STYLE DESIGNATOR: ROUND, ONE BOLT HOLE CIRCLE
•
BOLT HOLE DIAMETER: 0.221 INCHES NOMINAL IN
•
NECK HEIGHT: 1.500 INCHES NOMINAL IN
•
BOLT HOLE QUANTITY: 2
•
BOLT CIRCLE DIAMETER: 0.769 INCHES NOMINAL IN
•
MATERIAL: ALUMINUM
TECHNICAL CHARACTERISTICS
FLANGE DIAMETER2.620 INCHES NOMINAL IN
FLANGE SECTION STYLEPLAIN FACE, LONG NECK
STYLE DESIGNATORROUND, ONE BOLT HOLE CIRCLE
BOLT HOLE DIAMETER0.221 INCHES NOMINAL IN
NECK HEIGHT1.500 INCHES NOMINAL IN
BOLT HOLE QUANTITY2
BOLT CIRCLE DIAMETER0.769 INCHES NOMINAL IN
MATERIALALUMINUM
NECK DIAMETER1.030 INCHES NOMINAL IN
THICKNESS0.130 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 342521?
342521 is a FLANGE,PIPE.
What is the NSN for 342521?
342521 is cataloged in the U.S. Government catalog under NSN 4730-00-571-0581. 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.