PartsTable
Technical Data Sheet

A3-PS-000121/2 — PACKING NUT

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

A3-PS-000121/2: PACKING NUT.

The PACKING NUT is a the manufacturer industrial component. Key specifications include material: STEEL COMP 303, thread_size: 0.375-16, thread_class: 2A A, thread_length: 0.312 INCHES NOMINAL IN, overall_length: 0.687 INCHES NOMINAL IN, style_designator: HEXAGON, EXTERNAL THREAD, INVERTED FLARE. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-063-3694, 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
A3-PS-000121/2
NSN: 4730-01-063-3694
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: U4484 — CALDER LTD (GBR)
SPECIFICATIONS
materialSTEEL COMP 303
thread_size0.375-16
thread_class2A A
thread_length0.312 INCHES NOMINAL IN
overall_length0.687 INCHES NOMINAL IN
style_designatorHEXAGON, EXTERNAL THREAD, INVERTED FLARE
thread_directionRIGHT-HAND
seat_angle_in_deg45.0
width_across_flats0.750 INCHES NOMINAL IN
screw_thread_locationEXTERNAL
casehardening_indicatorNOT CASEHARDENED
smallest_inside_diameter0.078 INCHES NOMINAL IN
NSN4730-01-063-3694
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: A3-PS-000121/2 · 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: 0.750 INCHES NOMINAL IN
•
SEAT ANGLE IN DEG: 45.0
•
THREAD LENGTH: 0.312 INCHES NOMINAL IN
•
STYLE DESIGNATOR: HEXAGON, EXTERNAL THREAD, INVERTED FLARE
•
THREAD DIRECTION: RIGHT-HAND
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
•
THREAD SIZE: 0.375-16
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.750 INCHES NOMINAL IN
SEAT ANGLE IN DEG45.0
THREAD LENGTH0.312 INCHES NOMINAL IN
STYLE DESIGNATORHEXAGON, EXTERNAL THREAD, INVERTED FLARE
OVERALL LENGTH0.687 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
CASEHARDENING INDICATORNOT CASEHARDENED
THREAD SIZE0.375-16
SCREW THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
THREAD CLASS2A A
SUBSTITUTES & CROSS-REFERENCES 2
20488ASame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
A3-PS-000121Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is A3-PS-000121/2?
A3-PS-000121/2 is a PACKING NUT.
What parts can replace A3-PS-000121/2?
There are 2 known substitutes for A3-PS-000121/2: 20488A, A3-PS-000121. Substitute compatibility should be verified for your specific system.
What is the NSN for A3-PS-000121/2?
A3-PS-000121/2 is cataloged in the U.S. Government catalog under NSN 4730-01-063-3694. 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.