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74A410861-2003 — PACKING NUT

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

74A410861-2003: PACKING NUT.

The PACKING NUT is a the manufacturer industrial component. Key specifications include material: STEEL UNS K44220, thread_size: 5.500-16 AND 5.500-12, thread_class: 3A A, thread_length: 0.215 INCHES NOMINAL AND 0.812 INCHES NOMINAL IN, overall_length: 1.490 INCHES NOMINAL IN, style_designator: IRREGULAR. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-170-4001, 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
74A410861-2003
NSN: 4730-01-170-4001
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialSTEEL UNS K44220
thread_size5.500-16 AND 5.500-12
thread_class3A A
thread_length0.215 INCHES NOMINAL AND 0.812 INCHES NOMINAL IN
overall_length1.490 INCHES NOMINAL IN
style_designatorIRREGULAR
thread_directionRIGHT-HAND
width_across_flats5.830 INCHES NOMINAL IN
screw_thread_locationEXTERNAL
casehardening_indicatorNOT CASEHARDENED
smallest_inside_diameter5.003 INCHES NOMINAL IN
screw_thread_series_designatorUNIFIED NATIONAL JOINT (UNJ)
NSN4730-01-170-4001
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 74A410861-2003 · 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: 5.830 INCHES NOMINAL IN
•
THREAD LENGTH: 0.215 INCHES NOMINAL AND 0.812 INCHES NOMINAL IN
•
STYLE DESIGNATOR: IRREGULAR
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-8844,CL 3,COND E MIL SPEC SINGLE MATERIAL RESPONSE
•
THREAD DIRECTION: RIGHT-HAND
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
•
THREAD SIZE: 5.500-16 AND 5.500-12
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS5.830 INCHES NOMINAL IN
THREAD LENGTH0.215 INCHES NOMINAL AND 0.812 INCHES NOMINAL IN
STYLE DESIGNATORIRREGULAR
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-8844,CL 3,COND E MIL SPEC SINGLE MATERIAL RESPONSE
OVERALL LENGTH1.490 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
CASEHARDENING INDICATORNOT CASEHARDENED
THREAD SIZE5.500-16 AND 5.500-12
SCREW THREAD SERIES DESIGNATORUNIFIED NATIONAL JOINT (UNJ)
THREAD CLASS3A A
SUBSTITUTES & CROSS-REFERENCES 2
10108851Reference document
Same NSN cross-reference
Reference document — Informative reference only
1967C-20AReference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 74A410861-2003?
74A410861-2003 is a PACKING NUT.
What parts can replace 74A410861-2003?
There are 2 known substitutes for 74A410861-2003: 10108851, 1967C-20A. Substitute compatibility should be verified for your specific system.
What is the NSN for 74A410861-2003?
74A410861-2003 is cataloged in the U.S. Government catalog under NSN 4730-01-170-4001. 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.