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DYLZ203 — PACKING NUT

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

DYLZ203: PACKING NUT.

The PACKING NUT is a the manufacturer industrial component. Key specifications include material: STEEL UNS J03001, thread_size: 3/4IN-16 IN, thread_class: 3A A, thread_length: 0.406 INCHES NOMINAL IN, overall_length: 0.594 INCHES NOMINAL IN, style_designator: HEXAGON, EXTERNAL THREAD, INTERNAL SHOUL DER. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-554-9101, 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
DYLZ203
NSN: 4730-00-554-9101
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 05624 — GE AVIATION SYSTEMS LLC DBA GE AVIATION SYSTEMS LLC (USA)
SPECIFICATIONS
materialSTEEL UNS J03001
thread_size3/4IN-16 IN
thread_class3A A
thread_length0.406 INCHES NOMINAL IN
overall_length0.594 INCHES NOMINAL IN
style_designatorHEXAGON, EXTERNAL THREAD, INTERNAL SHOUL DER
thread_directionRIGHT-HAND
length_to_shoulder0.375 INCHES NOMINAL IN
width_across_flats1.000 INCHES NOMINAL IN
screw_thread_locationEXTERNAL
casehardening_indicatorNOT CASEHARDENED
largest_inside_diameter0.563 INCHES NOMINAL IN
NSN4730-00-554-9101
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: DYLZ203 · 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: 0.375 INCHES NOMINAL IN
•
WIDTH ACROSS FLATS: 1.000 INCHES NOMINAL IN
•
MATERIAL HARDNESS RATING: 30.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM
•
LARGEST INSIDE DIAMETER: 0.563 INCHES NOMINAL IN
•
THREAD LENGTH: 0.406 INCHES NOMINAL IN
•
STYLE DESIGNATOR: HEXAGON, EXTERNAL THREAD, INTERNAL SHOUL DER
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS
LENGTH TO SHOULDER0.375 INCHES NOMINAL IN
WIDTH ACROSS FLATS1.000 INCHES NOMINAL IN
MATERIAL HARDNESS RATING30.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM
LARGEST INSIDE DIAMETER0.563 INCHES NOMINAL IN
THREAD LENGTH0.406 INCHES NOMINAL IN
STYLE DESIGNATORHEXAGON, EXTERNAL THREAD, INTERNAL SHOUL DER
OVERALL LENGTH0.594 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
CASEHARDENING INDICATORNOT CASEHARDENED
THREAD SIZE3/4IN-16 IN
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

No substitute or cross-reference records for this part.

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 DYLZ203?
DYLZ203 is a PACKING NUT.
What is the NSN for DYLZ203?
DYLZ203 is cataloged in the U.S. Government catalog under NSN 4730-00-554-9101. 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.