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74B580173 — LOCKNUT,TUBE FITTING

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

74B580173: LOCKNUT,TUBE FITTING.

The LOCKNUT,TUBE FITTING is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY NUT, nut_style: TUBE FITTING LOCKNUT, nut_height: 0.500 INCHES NOMINAL IN, thread_class: 3B, thread_series: UNIFIED NATIONAL JOINT (UNJ), special_features: OUTSIDE EDGE OF NUT IS FLANGED. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-133-1590, 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
74B580173
NSN: 4730-01-133-1590
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialALUMINUM ALLOY NUT
nut_styleTUBE FITTING LOCKNUT
nut_height0.500 INCHES NOMINAL IN
thread_class3B
thread_seriesUNIFIED NATIONAL JOINT (UNJ)
special_featuresOUTSIDE EDGE OF NUT IS FLANGED
thread_directionRIGHT-HAND
surface_treatmentANODIZE NUT
width_across_flats3.350 INCHES NOMINAL IN
nominal_thread_size2.500 INCHES IN
packing_recess_depth0.090 INCHES NOMINAL IN
packing_recess_diameter2.580 INCHES NOMINAL IN
NSN4730-01-133-1590
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 74B580173 · 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
•
WIDTH ACROSS FLATS: 3.350 INCHES NOMINAL IN
•
PACKING RECESS DIAMETER: 2.580 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-A-8625,TYPE 2,CLASS 2 MIL SPEC SINGLE TREATMENT RESPONSE NUT
•
THREAD SERIES: UNIFIED NATIONAL JOINT (UNJ)
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-A-225,COND T851 FED SPEC SINGLE MATERIAL RESPONSE NUT
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 2.500 INCHES IN
•
NUT HEIGHT: 0.500 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS3.350 INCHES NOMINAL IN
PACKING RECESS DIAMETER2.580 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-A-8625,TYPE 2,CLASS 2 MIL SPEC SINGLE TREATMENT RESPONSE NUT
THREAD SERIESUNIFIED NATIONAL JOINT (UNJ)
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-225,COND T851 FED SPEC SINGLE MATERIAL RESPONSE NUT
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE2.500 INCHES IN
NUT HEIGHT0.500 INCHES NOMINAL IN
SPECIAL FEATURESOUTSIDE EDGE OF NUT IS FLANGED
SURFACE TREATMENTANODIZE NUT
OTHER ITEMS IN FSC 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4730-00-000-1895 4730-00-000-4289 4730-00-000-4445 4730-00-000-8373 4730-00-000-8897 4730-00-001-0007 4730-00-001-0008
SUBSTITUTES & CROSS-REFERENCES 4
LS580173Reference document
Same NSN cross-reference
Reference document — Secondary reference
74B580173-101Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
10108710Reference document
Same NSN cross-reference
Reference document — Informative reference only
LS580173-101Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 74B580173?
74B580173 is a LOCKNUT,TUBE FITTING.
What parts can replace 74B580173?
There are 4 known substitutes for 74B580173: LS580173, 74B580173-101, 10108710 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 74B580173?
74B580173 is cataloged in the U.S. Government catalog under NSN 4730-01-133-1590. 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.