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STSPB804 — NUT,TUBE COUPLING,REDUCING

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

STSPB804: NUT,TUBE COUPLING,REDUCING.

The NUT,TUBE COUPLING,REDUCING is a the manufacturer industrial component. Key specifications include material: ALUMINUM NUT, nut_style: TUBE COUPLING, nut_length: 0.871 INCHES MINIMUM AND 0.878 INCHES MAXIMUM IN, thread_class: 3B, thread_series: UNIFIED NATIONAL JOINT FINE (UNJF), width_across_flats: 0.783 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-402-8786, 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
STSPB804
NSN: 4730-00-402-8786
NIINs: 004028786, 004096272, 004096273, 010454810, 017010114
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 98897 — LOCKHEED MARTIN CORP (USA)
SPECIFICATIONS
materialALUMINUM NUT
nut_styleTUBE COUPLING
nut_length0.871 INCHES MINIMUM AND 0.878 INCHES MAXIMUM IN
thread_class3B
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF)
width_across_flats0.783 INCHES NOMINAL IN
nominal_thread_size0.750 INCHES IN
end_item_identificationC5
thread_quantity_per_inch16
nominal_tube_outside_diameter0.500 INCHES IN
material_document_and_classificationSTSPS003 MFR REF SINGLE MATERIAL RESPONSE NUT
part_name_assigned_by_controlling_agencyNUT-COUPLING,REDUCED
NSN4730-00-402-8786
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: STSPB804 · 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
•
LENGTH TO SHOULDER: 0.498 INCHES NOMINAL IN
•
WIDTH ACROSS FLATS: 0.684 INCHES MINIMUM AND 0.691 INCHES MAXIMUM IN
•
THREAD SERIES: UNIFIED NATIONAL JOINT FINE (UNJF)
•
SEAT ANGLE: 45.00 DEGREES NOMINAL
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.562 INCHES IN
•
NUT HEIGHT: 0.710 INCHES NOMINAL IN
•
SURFACE TREATMENT: CADMIUM OVERALL
TECHNICAL CHARACTERISTICS
LENGTH TO SHOULDER0.498 INCHES NOMINAL IN
WIDTH ACROSS FLATS0.684 INCHES MINIMUM AND 0.691 INCHES MAXIMUM IN
THREAD SERIESUNIFIED NATIONAL JOINT FINE (UNJF)
SEAT ANGLE45.00 DEGREES NOMINAL
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.562 INCHES IN
NUT HEIGHT0.710 INCHES NOMINAL IN
SURFACE TREATMENTCADMIUM OVERALL
NUT STYLETUBE COUPLING
THREAD CLASS3B
SUBSTITUTES & CROSS-REFERENCES 3
2-03018F06Reference document
Same NSN cross-reference
Reference document — Secondary reference
D8998F06Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
GA7432F06Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 STSPB804?
STSPB804 is a NUT,TUBE COUPLING,REDUCING.
What parts can replace STSPB804?
There are 3 known substitutes for STSPB804: 2-03018F06, D8998F06, GA7432F06. Substitute compatibility should be verified for your specific system.
What is the NSN for STSPB804?
STSPB804 is cataloged in the U.S. Government catalog under NSN 4730-00-402-8786. 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.