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DB4B — PACKING NUT

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

DB4B: PACKING NUT.

The PACKING NUT is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY, thread_size: 0.750-18, thread_class: 3B, thread_length: 0.437 INCHES NOMINAL IN, overall_length: 0.812 INCHES NOMINAL IN, style_designator: HEXAGON, INTERNAL THREAD, SHOULDERED. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-289-9174, 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
DB4B
NSN: 4730-00-289-9174
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 49367 — AMPHENOL CORPORATION DBA AMPHENOL AEROSPACE INDUSTRIAL DIV AMPHENOL AEROSPACE/PYLE NATIONAL (USA)
SPECIFICATIONS
materialALUMINUM ALLOY
thread_size0.750-18
thread_class3B
thread_length0.437 INCHES NOMINAL IN
overall_length0.812 INCHES NOMINAL IN
style_designatorHEXAGON, INTERNAL THREAD, SHOULDERED
thread_directionRIGHT-HAND
screw_thread_locationINTERNAL
casehardening_indicatorNOT CASEHARDENED
smallest_inside_diameter0.437 INCHES NOMINAL IN
screw_thread_series_designatorUNS
major_unthreaded_outside_diameter0.875 INCHES NOMINAL IN
NSN4730-00-289-9174
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: DB4B · 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: 0.437 INCHES NOMINAL IN
•
STYLE DESIGNATOR: HEXAGON, INTERNAL THREAD, SHOULDERED
•
THREAD DIRECTION: RIGHT-HAND
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
•
THREAD SIZE: 0.750-18
•
SCREW THREAD SERIES DESIGNATOR: UNS
•
THREAD CLASS: 3B
TECHNICAL CHARACTERISTICS
THREAD LENGTH0.437 INCHES NOMINAL IN
STYLE DESIGNATORHEXAGON, INTERNAL THREAD, SHOULDERED
OVERALL LENGTH0.812 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
CASEHARDENING INDICATORNOT CASEHARDENED
THREAD SIZE0.750-18
SCREW THREAD SERIES DESIGNATORUNS
THREAD CLASS3B
MAJOR UNTHREADED OUTSIDE DIAMETER0.875 INCHES NOMINAL IN
SCREW THREAD LOCATIONINTERNAL
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 DB4B?
DB4B is a PACKING NUT.
What is the NSN for DB4B?
DB4B is cataloged in the U.S. Government catalog under NSN 4730-00-289-9174. 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.