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YKA5566A — PACKING NUT

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

YKA5566A: PACKING NUT.

The PACKING NUT is a the manufacturer industrial component. Key specifications include material: STEEL COMP 12L14, thread_size: 1-3/4 IN-10 IN, thread_class: 2A A, thread_length: 0.625 INCHES NOMINAL IN, overall_length: 1.750 INCHES NOMINAL IN, style_designator: HEXAGON, EXTERNAL THREAD, INVERTED FLARE. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-362-6399, 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
YKA5566A
NSN: 4730-00-362-6399
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 7PZX0 — FAIRBANKS MORSE, LLC (USA)
SPECIFICATIONS
materialSTEEL COMP 12L14
thread_size1-3/4 IN-10 IN
thread_class2A A
thread_length0.625 INCHES NOMINAL IN
overall_length1.750 INCHES NOMINAL IN
style_designatorHEXAGON, EXTERNAL THREAD, INVERTED FLARE
thread_directionRIGHT-HAND
seat_angle_in_deg45.0
width_across_flats1.875 INCHES NOMINAL IN
screw_thread_locationEXTERNAL
casehardening_indicatorNOT CASEHARDENED
smallest_inside_diameter1.094 INCHES NOMINAL IN
NSN4730-00-362-6399
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: YKA5566A · 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: 1.875 INCHES NOMINAL IN
•
SEAT ANGLE IN DEG: 45.0
•
THREAD LENGTH: 0.625 INCHES NOMINAL IN
•
STYLE DESIGNATOR: HEXAGON, EXTERNAL THREAD, INVERTED FLARE
•
MATERIAL DOCUMENT AND CLASSIFICATION: FED STD 66, COMP 12L14 FED STD SINGLE MATERIAL RESPONSE
•
THREAD DIRECTION: RIGHT-HAND
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS1.875 INCHES NOMINAL IN
SEAT ANGLE IN DEG45.0
THREAD LENGTH0.625 INCHES NOMINAL IN
STYLE DESIGNATORHEXAGON, EXTERNAL THREAD, INVERTED FLARE
MATERIAL DOCUMENT AND CLASSIFICATIONFED STD 66, COMP 12L14 FED STD SINGLE MATERIAL RESPONSE
OVERALL LENGTH1.750 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
CASEHARDENING INDICATORNOT CASEHARDENED
THREAD SIZE1-3/4 IN-10 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 1
YKA5566APReference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Semi-active item — no replacement plannedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is YKA5566A?
YKA5566A is a PACKING NUT.
What parts can replace YKA5566A?
There is 1 known substitute for YKA5566A: YKA5566AP. Substitute compatibility should be verified for your specific system.
What is the NSN for YKA5566A?
YKA5566A is cataloged in the U.S. Government catalog under NSN 4730-00-362-6399. 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.