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A81371-002 — NUT,UNION

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

A81371-002: NUT,UNION.

The NUT,UNION is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, nut_style: HEXAGON, nut_height: 0.360 INCHES NOMINAL IN, width_across_flats: 0.375 INCHES NOMINAL IN, shoulder_seat_diameter: 190.32 INCHES NOMINAL IN, smallest_inside_diameter: 0.250 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-633-8271, 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
A81371-002
NSN: 4730-01-633-8271
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 19156 — MOOG INC DIV MOOG INC., SPACE AND DEFENSE - SALT LAKE CITY (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleHEXAGON
nut_height0.360 INCHES NOMINAL IN
width_across_flats0.375 INCHES NOMINAL IN
shoulder_seat_diameter190.32 INCHES NOMINAL IN
smallest_inside_diameter0.250 INCHES NOMINAL IN
part_name_assigned_by_controlling_agencyNUT, CAP
NSN4730-01-633-8271
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: A81371-002 · 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: 0.375 INCHES NOMINAL IN
•
NUT HEIGHT: 0.360 INCHES NOMINAL IN
•
NUT STYLE: HEXAGON
•
MATERIAL: STEEL OVERALL
•
SMALLEST INSIDE DIAMETER: 0.250 INCHES NOMINAL IN
•
SHOULDER SEAT DIAMETER: 190.32 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.375 INCHES NOMINAL IN
NUT HEIGHT0.360 INCHES NOMINAL IN
PART NAME ASSIGNED BY CONTROLLING AGENCYNUT, CAP
NUT STYLEHEXAGON
MATERIALSTEEL OVERALL
SMALLEST INSIDE DIAMETER0.250 INCHES NOMINAL IN
SHOULDER SEAT DIAMETER190.32 INCHES NOMINAL IN
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 A81371-002?
A81371-002 is a NUT,UNION.
What is the NSN for A81371-002?
A81371-002 is cataloged in the U.S. Government catalog under NSN 4730-01-633-8271. 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.