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PartsTable / COMPONENT / 79NTU066
79NTU066 ✓ Verified by PartsTable
— · NUT WASHER
WHAT YOU NEED TO KNOW
Match nut grade to bolt grade for full strength Lock nuts prevent loosening under vibration
Don't mix grades — weakens the joint
PRODUCT OVERVIEW

The NUT,SELF-LOCKING,HEXAGON is a the manufacturer industrial component. Key specifications include material: PLASTIC POLYAMIDE NYLON LOCKING INSERT, nut_style: HEXAGON, nut_height: 0.391 INCHES MINIMUM AND 0.421 INCHES MAXIMUM IN, temp_rating: 250.0 FAHRENHEIT NOMINAL DEGF, thread_class: 3B, thread_series: UNIFIED NATIONAL COARSE (UNC). This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-584-7991, 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
79NTU066
NSN: 5310-00-584-7991
FSC: 5310
CAGE: 72962 — HARVARD INDUSTRIES INC (USA)
SPECIFICATIONS
materialPLASTIC POLYAMIDE NYLON LOCKING INSERT
nut_styleHEXAGON
nut_height0.391 INCHES MINIMUM AND 0.421 INCHES MAXIMUM IN
temp_rating250.0 FAHRENHEIT NOMINAL DEGF
thread_class3B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
locking_featurePREVAILING TORQUE WITH NONMETALLIC INSERT
thread_directionRIGHT-HAND
surface_treatmentPASSIVATE NUT
width_across_flats0.675 INCHES MINIMUM AND 0.691 INCHES MAXIMUM IN
nominal_thread_size0.375 INCHES IN
thread_quantity_per_inch16
NSN5310-00-584-7991
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 79NTU066 · OEM ⚠ VERIFY BEFORE ORDERING Grade matters for torque spec — don't mix grades. A Grade 5 nut on a Grade 8 bolt weakens the joint. Lock nuts, wing nuts, and castle nuts are NOT interchangeable with standard hex ✓ BROKER TIP Match nut to bolt thread class and material. Stainless bolt + zinc nut = galvanic corrosion. Always verify finish matches (plain, zinc, hot-dip galvanized) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
THREAD QUANTITY PER INCH: 16
•
THREAD DIRECTION: RIGHT-HAND
•
TEMP RATING: 250.0 FAHRENHEIT NOMINAL DEGF
•
LOCKING FEATURE: PREVAILING TORQUE WITH NONMETALLIC INSERT
•
NOMINAL THREAD SIZE: 0.375 INCHES IN
•
NUT HEIGHT: 0.391 INCHES MINIMUM AND 0.421 INCHES MAXIMUM IN
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
MATERIAL: PLASTIC POLYAMIDE NYLON LOCKING INSERT
TECHNICAL CHARACTERISTICS (FLIS)
THREAD QUANTITY PER INCH16
THREAD DIRECTIONRIGHT-HAND
TEMP RATING250.0 FAHRENHEIT NOMINAL DEGF
LOCKING FEATUREPREVAILING TORQUE WITH NONMETALLIC INSERT
NOMINAL THREAD SIZE0.375 INCHES IN
NUT HEIGHT0.391 INCHES MINIMUM AND 0.421 INCHES MAXIMUM IN
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
MATERIALPLASTIC POLYAMIDE NYLON LOCKING INSERT
NUT STYLEHEXAGON
SURFACE TREATMENTPASSIVATE NUT
VERIFIED SUBSTITUTES & CROSS-REFERENCES 17
M24129-4-10CInterchangeable
interchangeable cross-reference
interchangeable
MS16228-6Interchangeable
interchangeable cross-reference
interchangeable
79NTU101Interchangeable
interchangeable cross-reference
interchangeable
9171979Interchangeable
interchangeable cross-reference
interchangeable
79NTU083Interchangeable
interchangeable cross-reference
interchangeable
MS16228-5Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 79NTU066?
79NTU066 is a NUT,SELF-LOCKING,HEXAGON.
What parts can replace 79NTU066?
There are 17 known substitutes for 79NTU066: M24129-4-10C, MS16228-6, 79NTU101 and 14 more. Substitute compatibility should be verified for your specific system.
Is 79NTU066 still available?
79NTU066 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026