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PA921-CG — NUT,TUBE COUPLING

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

PA921-CG: NUT,TUBE COUPLING.

The NUT,TUBE COUPLING is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OR STEEL OVERALL, nut_style: TUBE COUPLING, nut_height: 0.730 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN, seat_angle: 45.0 DEGREES NOMINAL, thread_class: 3B, thread_series: UNF. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-720-1104, 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
PA921-CG
NSN: 4730-00-720-1104
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 50948 — PARKER HANNIFIN CORP STRATOFLEX DIV AIRCRAFT FITTINGS OPN (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OR STEEL OVERALL
nut_styleTUBE COUPLING
nut_height0.730 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN
seat_angle45.0 DEGREES NOMINAL
thread_class3B
thread_seriesUNF
thread_directionRIGHT-HAND
surface_treatmentPASSIVATE OR ZINC OVERALL
fabrication_methodMACHINED
length_to_shoulder0.590 INCHES MINIMUM AND 0.630 INCHES MAXIMUM IN
width_across_flats0.590 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN
nominal_thread_size0.500 INCHES IN
NSN4730-00-720-1104
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: PA921-CG · 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: 0.590 INCHES MINIMUM AND 0.630 INCHES MAXIMUM IN
•
WIDTH ACROSS FLATS: 0.590 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN
•
THREAD SERIES: UNF
•
SEAT ANGLE: 45.0 DEGREES NOMINAL
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.500 INCHES IN
•
NUT HEIGHT: 0.730 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN
•
SURFACE TREATMENT: PASSIVATE OR ZINC OVERALL
TECHNICAL CHARACTERISTICS
LENGTH TO SHOULDER0.590 INCHES MINIMUM AND 0.630 INCHES MAXIMUM IN
WIDTH ACROSS FLATS0.590 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN
THREAD SERIESUNF
SEAT ANGLE45.0 DEGREES NOMINAL
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.500 INCHES IN
NUT HEIGHT0.730 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN
SURFACE TREATMENTPASSIVATE OR ZINC OVERALL
NUT STYLETUBE COUPLING
THREAD CLASS3B
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 1
PA921-5CGReference 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 PA921-CG?
PA921-CG is a NUT,TUBE COUPLING.
What parts can replace PA921-CG?
There is 1 known substitute for PA921-CG: PA921-5CG. Substitute compatibility should be verified for your specific system.
What is the NSN for PA921-CG?
PA921-CG is cataloged in the U.S. Government catalog under NSN 4730-00-720-1104. 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.