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Technical Data Sheet
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137397 ✓ 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 INVERTED NUT,TUBE COUPLING is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY 360, thread_size: 7/16-24, thread_class: 2A A, overall_length: 0.563 INCHES NOMINAL IN, style_designator: INVERTED NUT, TUBE, FLARE, thread_direction: RIGHT-HAND. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-013-7397, 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
137397
NSN: 4730-00-013-7397
FSC: 4730
CAGE: 23705 — FRUEHAUF CORP (USA)
SPECIFICATIONS
materialCOPPER ALLOY 360
thread_size7/16-24
thread_class2A A
overall_length0.563 INCHES NOMINAL IN
style_designatorINVERTED NUT, TUBE, FLARE
thread_directionRIGHT-HAND
seat_angle_in_deg45.0
width_across_flats0.433 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN
casehardening_indicatorNOT CASEHARDENED
end_item_identificationGRUMMAN A10 AIRCRAFTJ
smallest_inside_diameter0.255 INCHES MINIMUM AND 0.262 INCHES MAXIMUM IN
nondefinitive_spec/std_data9 FIGURE
NSN4730-00-013-7397
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 137397 · 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 30
121400Interchangeable
interchangeable cross-reference
interchangeable
100-4Interchangeable
interchangeable cross-reference
interchangeable
100-10528Interchangeable
interchangeable cross-reference
interchangeable
11070Interchangeable
interchangeable cross-reference
interchangeable
10045377Interchangeable
interchangeable cross-reference
interchangeable
105X4Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 137397?
137397 is a INVERTED NUT,TUBE COUPLING.
What parts can replace 137397?
There are 30 known substitutes for 137397: 121400, 100-4, 100-10528 and 27 more. Substitute compatibility should be verified for your specific system.
Is 137397 still available?
137397 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