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15-18-0368 — NUT,UNION

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

15-18-0368: NUT,UNION.

The NUT,UNION is a the manufacturer industrial component. Key specifications include material: NICKEL OVERALL, nut_style: HEXAGON, nut_height: 1.500 INCHES NOMINAL IN, thread_class: 2B, thread_series: UN, shoulder_width: 0.375 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-914-3158, 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
15-18-0368
NSN: 4730-00-914-3158
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 96169 — ELECTRIC BOAT CORPORATION DIV GENERAL DYNAMICS ELECTRIC BOAT (USA)
SPECIFICATIONS
materialNICKEL OVERALL
nut_styleHEXAGON
nut_height1.500 INCHES NOMINAL IN
thread_class2B
thread_seriesUN
shoulder_width0.375 INCHES NOMINAL IN
thread_directionRIGHT-HAND
width_across_flats4.125 INCHES NOMINAL IN
nominal_thread_size3.750 INCHES IN
shoulder_step_width0.437 INCHES NOMINAL IN
shoulder_seat_diameter3.750 INCHES NOMINAL IN
smallest_inside_diameter3.190 INCHES NOMINAL IN
NSN4730-00-914-3158
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 15-18-0368 · 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: 0.437 INCHES NOMINAL IN
•
SHOULDER WIDTH: 0.375 INCHES NOMINAL IN
•
THREAD SERIES: UN
•
MAXIMUM WORKING PRESSURE RATING AND SERVICE FOR WHICH DESIGNED: 6000.0 POUNDS PER SQUARE INCH (PSI) WATER AND 6000.0 POUNDS PER SQUARE INCH (PSI) OIL AND 6000.0 POUNDS PER SQUARE INCH (PSI) AIR LBS
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 3.750 INCHES IN
•
NONDEFINITIVE SPEC/STD DATA: 8 PIECE
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS4.125 INCHES NOMINAL IN
SHOULDER STEP WIDTH0.437 INCHES NOMINAL IN
SHOULDER WIDTH0.375 INCHES NOMINAL IN
THREAD SERIESUN
MAXIMUM WORKING PRESSURE RATING AND SERVICE FOR WHICH DESIGNED6000.0 POUNDS PER SQUARE INCH (PSI) WATER AND 6000.0 POUNDS PER SQUARE INCH (PSI) OIL AND 6000.0 POUNDS PER SQUARE INCH (PSI) AIR LBS
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE3.750 INCHES IN
NONDEFINITIVE SPEC/STD DATA8 PIECE
NUT HEIGHT1.500 INCHES NOMINAL IN
NUT STYLEHEXAGON
SUBSTITUTES & CROSS-REFERENCES 3
810-1385884Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
810-1385884 PC 8 2 IN IPSReference document
Same NSN cross-reference
Reference document — Secondary reference
803-1385884Reference document
Same NSN cross-reference
Reference document — Drawing number reference only
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 15-18-0368?
15-18-0368 is a NUT,UNION.
What parts can replace 15-18-0368?
There are 3 known substitutes for 15-18-0368: 810-1385884, 810-1385884 PC 8 2 IN IPS, 803-1385884. Substitute compatibility should be verified for your specific system.
What is the NSN for 15-18-0368?
15-18-0368 is cataloged in the U.S. Government catalog under NSN 4730-00-914-3158. 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.