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156425PC503 — PACKING NUT

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

156425PC503: PACKING NUT.

The PACKING NUT is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY, thread_size: 1-3/8-12, thread_class: 2A A, thread_length: 0.450 INCHES NOMINAL IN, overall_length: 0.995 INCHES NOMINAL IN, style_designator: HEXAGON, EXTERNAL THREAD, BOSS. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-936-8739, 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
156425PC503
NSN: 4730-00-936-8739
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 0AT62 — SIEMENS ENERGY, INC. DBA DRESSER-RAND (USA)
SPECIFICATIONS
materialCOPPER ALLOY
thread_size1-3/8-12
thread_class2A A
thread_length0.450 INCHES NOMINAL IN
overall_length0.995 INCHES NOMINAL IN
style_designatorHEXAGON, EXTERNAL THREAD, BOSS
thread_directionRIGHT-HAND
width_across_flats1.513 INCHES NOMINAL IN
screw_thread_locationEXTERNAL
casehardening_indicatorNOT CASEHARDENED
smallest_inside_diameter1.030 INCHES NOMINAL IN
screw_thread_series_designatorUNF
NSN4730-00-936-8739
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 156425PC503 · 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: 1.513 INCHES NOMINAL IN
•
THREAD LENGTH: 0.450 INCHES NOMINAL IN
•
STYLE DESIGNATOR: HEXAGON, EXTERNAL THREAD, BOSS
•
THREAD DIRECTION: RIGHT-HAND
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
•
THREAD SIZE: 1-3/8-12
•
SCREW THREAD SERIES DESIGNATOR: UNF
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS1.513 INCHES NOMINAL IN
THREAD LENGTH0.450 INCHES NOMINAL IN
STYLE DESIGNATORHEXAGON, EXTERNAL THREAD, BOSS
OVERALL LENGTH0.995 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
CASEHARDENING INDICATORNOT CASEHARDENED
THREAD SIZE1-3/8-12
SCREW THREAD SERIES DESIGNATORUNF
THREAD CLASS2A A
SCREW THREAD LOCATIONEXTERNAL
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
3241BReference 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
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FREQUENTLY ASKED QUESTIONS
What is 156425PC503?
156425PC503 is a PACKING NUT.
What parts can replace 156425PC503?
There is 1 known substitute for 156425PC503: 3241B. Substitute compatibility should be verified for your specific system.
What is the NSN for 156425PC503?
156425PC503 is cataloged in the U.S. Government catalog under NSN 4730-00-936-8739. 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.