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803-7657203ITEM38 — NUT,UNION

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

803-7657203ITEM38: NUT,UNION.

The NUT,UNION is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY 400 NUT, nut_style: HEXAGON, nut_height: 0.73 INCHES MINIMUM AND 0.79 INCHES MAXIMUM IN, thread_series: UNS, shoulder_width: 0.125 INCHES MINIMUM AND 0.145 INCHES MAXIMUM IN, special_features: WIDTH ACROSS POINTS - NOMINAL DIAMETER IS 2.060. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-599-0059, 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
803-7657203ITEM38
NSN: 4730-01-599-0059
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
materialNICKEL ALLOY 400 NUT
nut_styleHEXAGON
nut_height0.73 INCHES MINIMUM AND 0.79 INCHES MAXIMUM IN
thread_seriesUNS
shoulder_width0.125 INCHES MINIMUM AND 0.145 INCHES MAXIMUM IN
special_featuresWIDTH ACROSS POINTS - NOMINAL DIAMETER IS 2.060
width_across_flats1.798 INCHES MINIMUM AND 1.813 INCHES MAXIMUM IN
nominal_thread_size1.5 INCHES IN
shoulder_step_width0.145 INCHES MINIMUM AND 0.175 INCHES MAXIMUM IN
hole_configuration_styleCONFIGURATION C
smallest_inside_diameter1.21 INCHES MINIMUM AND 1.23 INCHES MAXIMUM IN
thread_quantity_per_inch14
NSN4730-01-599-0059
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 803-7657203ITEM38 · 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: 1.798 INCHES MINIMUM AND 1.813 INCHES MAXIMUM IN
•
SHOULDER STEP WIDTH: 0.145 INCHES MINIMUM AND 0.175 INCHES MAXIMUM IN
•
SHOULDER WIDTH: 0.125 INCHES MINIMUM AND 0.145 INCHES MAXIMUM IN
•
THREAD SERIES: UNS
•
HOLE CONFIGURATION STYLE: CONFIGURATION C
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-N-281, CL A, UN N04400 FED SPEC SINGLE MATERIAL RESPONSE NUT
•
NOMINAL THREAD SIZE: 1.5 INCHES IN
•
NUT HEIGHT: 0.73 INCHES MINIMUM AND 0.79 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS1.798 INCHES MINIMUM AND 1.813 INCHES MAXIMUM IN
SHOULDER STEP WIDTH0.145 INCHES MINIMUM AND 0.175 INCHES MAXIMUM IN
SHOULDER WIDTH0.125 INCHES MINIMUM AND 0.145 INCHES MAXIMUM IN
THREAD SERIESUNS
HOLE CONFIGURATION STYLECONFIGURATION C
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-N-281, CL A, UN N04400 FED SPEC SINGLE MATERIAL RESPONSE NUT
NOMINAL THREAD SIZE1.5 INCHES IN
NUT HEIGHT0.73 INCHES MINIMUM AND 0.79 INCHES MAXIMUM IN
SPECIAL FEATURESWIDTH ACROSS POINTS - NOMINAL DIAMETER IS 2.060
PART NAME ASSIGNED BY CONTROLLING AGENCYUNION NUT
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
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 803-7657203ITEM38?
803-7657203ITEM38 is a NUT,UNION.
What is the NSN for 803-7657203ITEM38?
803-7657203ITEM38 is cataloged in the U.S. Government catalog under NSN 4730-01-599-0059. 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.