PartsTable
Technical Data Sheet

761FB-1/4 — NUT,TUBE COUPLING

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

761FB-1/4: NUT,TUBE COUPLING.

The NUT,TUBE COUPLING is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY 360 OR COPPER ALLOY OVERALL, nut_style: TUBE COUPLING, nut_height: 0.584 INCHES MINIMUM AND 0.609 INCHES MAXIMUM IN, thread_class: 2B, thread_series: UNF, thread_direction: RIGHT-HAND. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-994-8567, 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
761FB-1/4
NSN: 4730-00-994-8567
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 1G932 — LESMAN INSTRUMENT CO (USA)
SPECIFICATIONS
materialCOPPER ALLOY 360 OR COPPER ALLOY OVERALL
nut_styleTUBE COUPLING
nut_height0.584 INCHES MINIMUM AND 0.609 INCHES MAXIMUM IN
thread_class2B
thread_seriesUNF
thread_directionRIGHT-HAND
fabrication_methodMACHINED
length_to_shoulder0.250 INCHES MINIMUM AND 0.281 INCHES MAXIMUM IN
width_across_flats0.615 INCHES MINIMUM AND 0.635 INCHES MAXIMUM IN
nominal_thread_size0.500 INCHES IN
smallest_inside_diameter0.250 INCHES MINIMUM AND 0.266 INCHES MAXIMUM IN
thread_quantity_per_inch20
NSN4730-00-994-8567
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 761FB-1/4 · 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
•
LENGTH TO SHOULDER: 0.250 INCHES MINIMUM AND 0.281 INCHES MAXIMUM IN
•
WIDTH ACROSS FLATS: 0.615 INCHES MINIMUM AND 0.635 INCHES MAXIMUM IN
•
THREAD SERIES: UNF
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-B-626,COMP 22,1/2 H FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.500 INCHES IN
•
NUT HEIGHT: 0.584 INCHES MINIMUM AND 0.609 INCHES MAXIMUM IN
•
NUT STYLE: TUBE COUPLING
TECHNICAL CHARACTERISTICS
LENGTH TO SHOULDER0.250 INCHES MINIMUM AND 0.281 INCHES MAXIMUM IN
WIDTH ACROSS FLATS0.615 INCHES MINIMUM AND 0.635 INCHES MAXIMUM IN
THREAD SERIESUNF
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-B-626,COMP 22,1/2 H FED SPEC SINGLE MATERIAL RESPONSE OVERALL
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.500 INCHES IN
NUT HEIGHT0.584 INCHES MINIMUM AND 0.609 INCHES MAXIMUM IN
NUT STYLETUBE COUPLING
THREAD CLASS2B
THREAD QUANTITY PER INCH20
SUBSTITUTES & CROSS-REFERENCES 2
761FB 1-4INReference document
Same NSN cross-reference
Reference document — Secondary reference
761FBReference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 761FB-1/4?
761FB-1/4 is a NUT,TUBE COUPLING.
What parts can replace 761FB-1/4?
There are 2 known substitutes for 761FB-1/4: 761FB 1-4IN, 761FB. Substitute compatibility should be verified for your specific system.
What is the NSN for 761FB-1/4?
761FB-1/4 is cataloged in the U.S. Government catalog under NSN 4730-00-994-8567. 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.