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A3-PS-000121/2 — Technical Data Sheet

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— · HOSE FITTING
WHAT YOU NEED TO KNOW
PTFE tape on tapered threads (NPT/BSPT) JIC/AN flare connections seal metal-to-metal — no tape
NPT != BSPT — look identical, NOT interchangeable
PRODUCT OVERVIEW

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 product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) 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
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
•
THREAD LENGTH: 0.312 INCHES NOMINAL IN
•
SCREW THREAD LOCATION: EXTERNAL
•
STYLE DESIGNATOR: HEXAGON, EXTERNAL THREAD, INVERTED FLARE
•
WIDTH ACROSS FLATS: 0.750 INCHES NOMINAL IN
•
SMALLEST INSIDE DIAMETER: 0.078 INCHES NOMINAL IN
•
MATERIAL: STEEL COMP 303
•
SEAT ANGLE IN DEG: 45.0
•
THREAD CLASS: 2A A
TECHNICAL CHARACTERISTICS (FLIS)
THREAD LENGTH0.312 INCHES NOMINAL IN
SCREW THREAD LOCATIONEXTERNAL
STYLE DESIGNATORHEXAGON, EXTERNAL THREAD, INVERTED FLARE
WIDTH ACROSS FLATS0.750 INCHES NOMINAL IN
SMALLEST INSIDE DIAMETER0.078 INCHES NOMINAL IN
MATERIALSTEEL COMP 303
SEAT ANGLE IN DEG45.0
THREAD CLASS2A A
THREAD DIRECTIONRIGHT-HAND
SCREW THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
VERIFIED SUBSTITUTES & CROSS-REFERENCES 14
A3-PS-000121 3Interchangeable
interchangeable cross-reference
interchangeable
18318AInterchangeable
interchangeable cross-reference
interchangeable
A3-PS-000121Interchangeable
interchangeable cross-reference
interchangeable
5876A92Interchangeable
interchangeable cross-reference
interchangeable
7052637-02Interchangeable
interchangeable cross-reference
interchangeable
PRP568-138 2069-70Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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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 14 known substitutes for A3-PS-000121/2: A3-PS-000121 3, 18318A, A3-PS-000121 and 11 more. 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 Federal Logistics Information System (FLIS) under NSN 4730-01-063-3694. This indicates validated use in U.S. government and defense supply chains.
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Last verified: September 2026