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HRB561 — PACKING NUT

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

HRB561: PACKING NUT.

The PACKING NUT is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY, slot_width: 0.250 INCHES NOMINAL IN, thread_size: 3/4 IN-16 IN, thread_class: 2A A, thread_length: 0.625 INCHES NOMINAL IN, overall_length: 1.432 INCHES MINIMUM AND 1.442 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-700-9391, 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
HRB561
NSN: 4730-00-700-9391
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 27996 — HEIL ENVIRONMENTAL INDUSTRIES (USA)
SPECIFICATIONS
materialCOPPER ALLOY
slot_width0.250 INCHES NOMINAL IN
thread_size3/4 IN-16 IN
thread_class2A A
thread_length0.625 INCHES NOMINAL IN
overall_length1.432 INCHES MINIMUM AND 1.442 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
length_to_shoulder0.625 INCHES NOMINAL IN
hole_or_slot_quantity4
screw_thread_locationEXTERNAL
casehardening_indicatorNOT CASEHARDENED
largest_inside_diameter0.650 INCHES NOMINAL IN
NSN4730-00-700-9391
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: HRB561 · 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: 0.625 INCHES NOMINAL IN
•
HOLE OR SLOT QUANTITY: 4
•
LARGEST INSIDE DIAMETER: 0.650 INCHES NOMINAL IN
•
THREAD LENGTH: 0.625 INCHES NOMINAL IN
•
SMALLEST OUTSIDE DIAMETER: 0.741 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
•
THREAD DIRECTION: RIGHT-HAND
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
TECHNICAL CHARACTERISTICS
LENGTH TO SHOULDER0.625 INCHES NOMINAL IN
HOLE OR SLOT QUANTITY4
LARGEST INSIDE DIAMETER0.650 INCHES NOMINAL IN
THREAD LENGTH0.625 INCHES NOMINAL IN
OVERALL LENGTH1.432 INCHES MINIMUM AND 1.442 INCHES MAXIMUM IN
SMALLEST OUTSIDE DIAMETER0.741 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
THREAD DIRECTIONRIGHT-HAND
CASEHARDENING INDICATORNOT CASEHARDENED
THREAD SIZE3/4 IN-16 IN
SCREW THREAD SERIES DESIGNATORUNF
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
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is HRB561?
HRB561 is a PACKING NUT.
What is the NSN for HRB561?
HRB561 is cataloged in the U.S. Government catalog under NSN 4730-00-700-9391. 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.