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137397 — INVERTED NUT,TUBE COUPLING

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

137397: INVERTED NUT,TUBE COUPLING.

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 U.S.

Government catalog 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
NIINs: 000137397, 000142432, 014901743
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
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
SUBSTITUTES & CROSS-REFERENCES 8
110-6752Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
705FB3Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
FC02577Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
3Q713BReference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
4482Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
41-W-04Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 137397?
137397 is a INVERTED NUT,TUBE COUPLING.
What parts can replace 137397?
There are 8 known substitutes for 137397: 110-6752, 705FB3, FC02577 and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 137397?
137397 is cataloged in the U.S. Government catalog under NSN 4730-00-013-7397. 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.