PartsTable
Technical Data Sheet
Download PDF

1258143 — PACKING NUT

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

1258143: PACKING NUT.

The PACKING NUT is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY 642, thread_size: 2-1/2-12, thread_class: 3B, thread_length: 0.750 INCHES NOMINAL IN, overall_length: 1.375 INCHES NOMINAL IN, style_designator: KNURLED, INTERNAL THREAD, SHOULDERED. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-144-9334, 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
1258143
NSN: 4730-01-144-9334
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 06350 — ASSET SYSTEMS, INC. DBA ASSET SYSTEMS INC (USA)
SPECIFICATIONS
materialCOPPER ALLOY 642
thread_size2-1/2-12
thread_class3B
thread_length0.750 INCHES NOMINAL IN
overall_length1.375 INCHES NOMINAL IN
style_designatorKNURLED, INTERNAL THREAD, SHOULDERED
thread_directionRIGHT-HAND
length_to_shoulder1.000 INCHES MINIMUM AND 1.025 INCHES MAXIMUM IN
screw_thread_locationINTERNAL
casehardening_indicatorNOT CASEHARDENED
smallest_inside_diameter1.000 INCHES NOMINAL IN
screw_thread_series_designatorUN
NSN4730-01-144-9334
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 1258143 · 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: 1.000 INCHES MINIMUM AND 1.025 INCHES MAXIMUM IN
•
THREAD LENGTH: 0.750 INCHES NOMINAL IN
•
STYLE DESIGNATOR: KNURLED, INTERNAL THREAD, SHOULDERED
•
THREAD DIRECTION: RIGHT-HAND
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
•
THREAD SIZE: 2-1/2-12
•
SCREW THREAD SERIES DESIGNATOR: UN
TECHNICAL CHARACTERISTICS
LENGTH TO SHOULDER1.000 INCHES MINIMUM AND 1.025 INCHES MAXIMUM IN
THREAD LENGTH0.750 INCHES NOMINAL IN
STYLE DESIGNATORKNURLED, INTERNAL THREAD, SHOULDERED
OVERALL LENGTH1.375 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
CASEHARDENING INDICATORNOT CASEHARDENED
THREAD SIZE2-1/2-12
SCREW THREAD SERIES DESIGNATORUN
THREAD CLASS3B
MAJOR UNTHREADED OUTSIDE DIAMETER2.938 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 3
820-5348328Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
1258143 PIECE 6Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
1258143 PC 6Reference 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
Ready to buy 1258143?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is 1258143?
1258143 is a PACKING NUT.
What parts can replace 1258143?
There are 3 known substitutes for 1258143: 820-5348328, 1258143 PIECE 6, 1258143 PC 6. Substitute compatibility should be verified for your specific system.
What is the NSN for 1258143?
1258143 is cataloged in the U.S. Government catalog under NSN 4730-01-144-9334. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — 1258143

✓ 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.