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PartsTable / COMPONENT / 646A078H05
646A078H05 ✓ 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 OVERALL, nut_style: TUBE COUPLING, nut_height: 0.625 INCHES NOMINAL IN, thread_class: 2B, thread_series: UNF, thread_direction: RIGHT-HAND. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-201-3081, 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
646A078H05
NSN: 4730-00-201-3081
FSC: 4730
CAGE: 97942 — NORTHROP GRUMMAN SYSTEMS CORPORATION DBA NORTHROP GRUMMAN SYSTEMS CORP (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
nut_styleTUBE COUPLING
nut_height0.625 INCHES NOMINAL IN
thread_class2B
thread_seriesUNF
thread_directionRIGHT-HAND
fabrication_methodMACHINED
width_across_flats0.688 INCHES NOMINAL IN
nominal_thread_size0.562 INCHES IN
smallest_inside_diameter0.440 INCHES NOMINAL IN
thread_quantity_per_inch18
nominal_tube_outside_diameter0.437 INCHES IN
NSN4730-00-201-3081
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 646A078H05 · 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
•
NUT HEIGHT: 0.625 INCHES NOMINAL IN
•
WIDTH ACROSS FLATS: 0.688 INCHES NOMINAL IN
•
MATERIAL: COPPER ALLOY OVERALL
•
NUT STYLE: TUBE COUPLING
•
THREAD SERIES: UNF
•
SMALLEST INSIDE DIAMETER: 0.440 INCHES NOMINAL IN
•
NOMINAL THREAD SIZE: 0.562 INCHES IN
TECHNICAL CHARACTERISTICS (FLIS)
NUT HEIGHT0.625 INCHES NOMINAL IN
WIDTH ACROSS FLATS0.688 INCHES NOMINAL IN
WIDTH ACROSS FLATS0.688 INCHES NOMINAL IN
MATERIALCOPPER ALLOY OVERALL
NUT STYLETUBE COUPLING
THREAD SERIESUNF
SMALLEST INSIDE DIAMETER0.440 INCHES NOMINAL IN
NOMINAL THREAD SIZE0.562 INCHES IN
MATERIALCOPPER ALLOY OVERALL
NOMINAL TUBE OUTSIDE DIAMETER0.437 INCHES IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
N20Interchangeable
interchangeable cross-reference
interchangeable
0023039Interchangeable
interchangeable cross-reference
interchangeable
H03-15Interchangeable
interchangeable cross-reference
interchangeable
6300-20Interchangeable
interchangeable cross-reference
interchangeable
815N20Interchangeable
interchangeable cross-reference
interchangeable
N20-82000HMSP0RM1PCTInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 646A078H05?
646A078H05 is a NUT,TUBE COUPLING.
What parts can replace 646A078H05?
There are 9 known substitutes for 646A078H05: N20, 0023039, H03-15 and 6 more. Substitute compatibility should be verified for your specific system.
Is 646A078H05 still available?
646A078H05 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026