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A414240-8 — NUT,UNION

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

A414240-8: NUT,UNION.

The NUT,UNION is a the manufacturer industrial component. Key specifications include nut_height: 1.500 INCHES NOMINAL IN, thread_series: UN, shoulder_width: 0.375 INCHES NOMINAL IN, thread_direction: RIGHT-HAND, width_across_flats: 4.125 INCHES NOMINAL IN, shoulder_step_width: 0.375 INCHES MINIMUM AND 0.391 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-901-6294, 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
A414240-8
NSN: 4730-00-901-6294
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 80020 — NAVAL AIR WARFARE CENTER AIRCRAFT DIVISION JOINT BASE JBMDL (USA)
SPECIFICATIONS
nut_height1.500 INCHES NOMINAL IN
thread_seriesUN
shoulder_width0.375 INCHES NOMINAL IN
thread_directionRIGHT-HAND
width_across_flats4.125 INCHES NOMINAL IN
shoulder_step_width0.375 INCHES MINIMUM AND 0.391 INCHES MAXIMUM IN
shoulder_seat_diameter3.755 INCHES MINIMUM AND 3.765 INCHES MAXIMUM IN
smallest_inside_diameter3.190 INCHES MINIMUM AND 3.193 INCHES MAXIMUM IN
NSN4730-00-901-6294
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: A414240-8 · 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
•
WIDTH ACROSS FLATS: 4.125 INCHES NOMINAL IN
•
SHOULDER STEP WIDTH: 0.375 INCHES MINIMUM AND 0.391 INCHES MAXIMUM IN
•
SHOULDER WIDTH: 0.375 INCHES NOMINAL IN
•
THREAD SERIES: UN
•
THREAD DIRECTION: RIGHT-HAND
•
NUT HEIGHT: 1.500 INCHES NOMINAL IN
•
SMALLEST INSIDE DIAMETER: 3.190 INCHES MINIMUM AND 3.193 INCHES MAXIMUM IN
•
SHOULDER SEAT DIAMETER: 3.755 INCHES MINIMUM AND 3.765 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS4.125 INCHES NOMINAL IN
SHOULDER STEP WIDTH0.375 INCHES MINIMUM AND 0.391 INCHES MAXIMUM IN
SHOULDER WIDTH0.375 INCHES NOMINAL IN
THREAD SERIESUN
THREAD DIRECTIONRIGHT-HAND
NUT HEIGHT1.500 INCHES NOMINAL IN
SMALLEST INSIDE DIAMETER3.190 INCHES MINIMUM AND 3.193 INCHES MAXIMUM IN
SHOULDER SEAT DIAMETER3.755 INCHES MINIMUM AND 3.765 INCHES MAXIMUM IN
SUBSTITUTES & CROSS-REFERENCES 1
EPA21000-273Reference document
Same NSN cross-reference
Reference document — NATO reproduction reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is A414240-8?
A414240-8 is a NUT,UNION.
What parts can replace A414240-8?
There is 1 known substitute for A414240-8: EPA21000-273. Substitute compatibility should be verified for your specific system.
What is the NSN for A414240-8?
A414240-8 is cataloged in the U.S. Government catalog under NSN 4730-00-901-6294. 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.