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HRB4 — PACKING NUT

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

HRB4: PACKING NUT.

The PACKING NUT is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY OR COPPER ALLOY, thread_size: 3/4-16, thread_class: 2B, thread_length: 0.350 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN, overall_length: 0.625 INCHES NOMINAL IN, style_designator: KNURLED, INTERNAL THREAD, SHOULDERED. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-200-0459, 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
HRB4
NSN: 4730-00-200-0459
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 81718 — OPW FUELING COMPONENTS INC. DIV OPW FUELING COMPONENTS (USA)
SPECIFICATIONS
materialALUMINUM ALLOY OR COPPER ALLOY
thread_size3/4-16
thread_class2B
thread_length0.350 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN
overall_length0.625 INCHES NOMINAL IN
style_designatorKNURLED, INTERNAL THREAD, SHOULDERED
thread_directionRIGHT-HAND
length_to_shoulder0.500 INCHES NOMINAL IN
screw_thread_locationINTERNAL
casehardening_indicatorNOT CASEHARDENED
smallest_inside_diameter0.281 INCHES MINIMUM AND 0.284 INCHES MAXIMUM IN
screw_thread_series_designatorUNF
NSN4730-00-200-0459
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: HRB4 · 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: 0.500 INCHES NOMINAL IN
•
THREAD LENGTH: 0.350 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: KNURLED, INTERNAL THREAD, SHOULDERED
•
THREAD DIRECTION: RIGHT-HAND
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
•
THREAD SIZE: 3/4-16
•
SCREW THREAD SERIES DESIGNATOR: UNF
TECHNICAL CHARACTERISTICS
LENGTH TO SHOULDER0.500 INCHES NOMINAL IN
THREAD LENGTH0.350 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN
STYLE DESIGNATORKNURLED, INTERNAL THREAD, SHOULDERED
OVERALL LENGTH0.625 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
CASEHARDENING INDICATORNOT CASEHARDENED
THREAD SIZE3/4-16
SCREW THREAD SERIES DESIGNATORUNF
THREAD CLASS2B
MAJOR UNTHREADED OUTSIDE DIAMETER0.875 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 3
7329618Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
2301430Reference document
Same NSN cross-reference
Reference document — Secondary reference
761E17Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is HRB4?
HRB4 is a PACKING NUT.
What parts can replace HRB4?
There are 3 known substitutes for HRB4: 7329618, 2301430, 761E17. Substitute compatibility should be verified for your specific system.
What is the NSN for HRB4?
HRB4 is cataloged in the U.S. Government catalog under NSN 4730-00-200-0459. 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.