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NS4-8 — NUT,TUBE COUPLING

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

NS4-8: NUT,TUBE COUPLING.

The NUT,TUBE COUPLING is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY OVERALL, nut_style: TUBE COUPLING, nut_height: 0.810 INCHES NOMINAL IN, seat_angle: 43.0 DEGREES NOMINAL, thread_class: 2B, thread_series: UNF. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-189-2741, 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
NS4-8
NSN: 4730-00-189-2741
NIINs: 001892741, 012018877, 012339965
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 58553 — SUPERIOR VALVE CO (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
nut_styleTUBE COUPLING
nut_height0.810 INCHES NOMINAL IN
seat_angle43.0 DEGREES NOMINAL
thread_class2B
thread_seriesUNF
thread_directionRIGHT-HAND
fabrication_methodFORGED
width_across_flats0.938 INCHES NOMINAL IN
nominal_thread_size0.750 INCHES IN
smallest_inside_diameter0.505 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN
thread_quantity_per_inch16
NSN4730-00-189-2741
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: NS4-8 · 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
SUBSTITUTES & CROSS-REFERENCES 4
5-13-2041-10-18Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
J513Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
7454261P5Reference document
Same NSN cross-reference
Reference document — Secondary reference
MS35872-4Reference document
Same NSN cross-reference
Reference document — Identification reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Terminal item — no further procurement; issued until stock is exhaustedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is NS4-8?
NS4-8 is a NUT,TUBE COUPLING.
What parts can replace NS4-8?
There are 4 known substitutes for NS4-8: 5-13-2041-10-18, J513, 7454261P5 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for NS4-8?
NS4-8 is cataloged in the U.S. Government catalog under NSN 4730-00-189-2741. 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.