PartsTable
Technical Data Sheet
PartsTable / COMPONENT / NS4-6
NS4-6 ✓ Verified by PartsTable
— · HOSE FITTING
WHAT YOU NEED TO KNOW
PTFE tape on tapered threads (NPT/BSPT) JIC/AN flare connections seal metal-to-metal — no tape
NPT != BSPT — look identical, NOT interchangeable
PRODUCT OVERVIEW

The NUT,TUBE COUPLING is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY 377 OVERALL, nut_style: TUBE COUPLING, nut_height: 0.750 INCHES NOMINAL IN, seat_angle: 45.00 DEGREES NOMINAL, thread_class: 2B, thread_series: UNF. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-293-3641, 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
NS4-6
NSN: 4730-00-293-3641
FSC: 4730
CAGE: 58553 — SUPERIOR VALVE CO (USA)
SPECIFICATIONS
materialCOPPER ALLOY 377 OVERALL
nut_styleTUBE COUPLING
nut_height0.750 INCHES NOMINAL IN
seat_angle45.00 DEGREES NOMINAL
thread_class2B
thread_seriesUNF
thread_directionRIGHT-HAND
fabrication_methodFORGED
length_to_shoulder0.438 INCHES NOMINAL IN
width_across_flats0.875 INCHES NOMINAL IN
nominal_thread_size0.625 INCHES IN
smallest_inside_diameter0.380 INCHES NOMINAL IN
NSN4730-00-293-3641
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: NS4-6 · 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
•
MATERIAL: COPPER ALLOY 377 OVERALL
•
THREAD DIRECTION: RIGHT-HAND
•
SEAT ANGLE: 45.00 DEGREES NOMINAL
•
NOMINAL THREAD SIZE: 0.625 INCHES IN
•
SMALLEST INSIDE DIAMETER: 0.380 INCHES NOMINAL IN
•
FABRICATION METHOD: FORGED
•
LENGTH TO SHOULDER: 0.438 INCHES NOMINAL IN
•
WIDTH ACROSS FLATS: 0.875 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALCOPPER ALLOY 377 OVERALL
THREAD DIRECTIONRIGHT-HAND
SEAT ANGLE45.00 DEGREES NOMINAL
NOMINAL THREAD SIZE0.625 INCHES IN
SMALLEST INSIDE DIAMETER0.380 INCHES NOMINAL IN
FABRICATION METHODFORGED
LENGTH TO SHOULDER0.438 INCHES NOMINAL IN
WIDTH ACROSS FLATS0.875 INCHES NOMINAL IN
NUT HEIGHT0.750 INCHES NOMINAL IN
NOMINAL TUBE OUTSIDE DIAMETER0.375 INCHES IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
76206Interchangeable
interchangeable cross-reference
interchangeable
580-086Interchangeable
interchangeable cross-reference
interchangeable
15205Interchangeable
interchangeable cross-reference
interchangeable
B18.3Interchangeable
interchangeable cross-reference
interchangeable
7618A48Interchangeable
Same NIIN cross-reference
interchangeable
7618-48Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is NS4-6?
NS4-6 is a NUT,TUBE COUPLING.
What parts can replace NS4-6?
There are 6 known substitutes for NS4-6: 76206, 580-086, 15205 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for NS4-6?
NS4-6 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-293-3641. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026