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79NC4-40 — NUT,SELF-LOCKING,CLINCH

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

79NC4-40: NUT,SELF-LOCKING,CLINCH.

The NUT,SELF-LOCKING,CLINCH is a the manufacturer industrial component. Key specifications include material: PLASTIC LOCKING INSERT, nut_style: CLINCH, nut_height: 0.270 INCHES MINIMUM AND 0.282 INCHES MAXIMUM IN, pilot_length: 0.129 INCHES MINIMUM AND 0.141 INCHES MAXIMUM IN, thread_class: 3B, thread_series: UNIFIED NATIONAL COARSE (UNC). This part is cataloged in the U.S.

Government catalog under NSN 5310-00-836-7674, 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
79NC4-40
NSN: 5310-00-836-7674
FSC: 5310 — Nuts and Washers
CAGE: 72962 — HARVARD INDUSTRIES INC (USA)
SPECIFICATIONS
materialPLASTIC LOCKING INSERT
nut_styleCLINCH
nut_height0.270 INCHES MINIMUM AND 0.282 INCHES MAXIMUM IN
pilot_length0.129 INCHES MINIMUM AND 0.141 INCHES MAXIMUM IN
thread_class3B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
pilot_diameter0.187 INCHES MINIMUM AND 0.191 INCHES MAXIMUM IN
locking_featurePREVAILING TORQUE WITH NONMETALLIC INSERT
thread_directionRIGHT-HAND
surface_treatmentCADMIUM OR PASSIVATE OVERALL EXCEPT INSERT
width_across_flats0.255 INCHES NOMINAL IN
nominal_thread_size0.112 INCHES IN
NSN5310-00-836-7674
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 79NC4-40 · 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
•
WIDTH ACROSS FLATS: 0.255 INCHES NOMINAL IN
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.112 INCHES IN
•
PILOT DIAMETER: 0.187 INCHES MINIMUM AND 0.191 INCHES MAXIMUM IN
•
PILOT LENGTH: 0.129 INCHES MINIMUM AND 0.141 INCHES MAXIMUM IN
•
LOCKING FEATURE: PREVAILING TORQUE WITH NONMETALLIC INSERT
•
NUT HEIGHT: 0.270 INCHES MINIMUM AND 0.282 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.255 INCHES NOMINAL IN
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.112 INCHES IN
PILOT DIAMETER0.187 INCHES MINIMUM AND 0.191 INCHES MAXIMUM IN
PILOT LENGTH0.129 INCHES MINIMUM AND 0.141 INCHES MAXIMUM IN
LOCKING FEATUREPREVAILING TORQUE WITH NONMETALLIC INSERT
NUT HEIGHT0.270 INCHES MINIMUM AND 0.282 INCHES MAXIMUM IN
SURFACE TREATMENTCADMIUM OR PASSIVATE OVERALL EXCEPT INSERT
NUT STYLECLINCH
SUBSTITUTES & CROSS-REFERENCES 2
2532993-28Reference document
Same NSN cross-reference
Reference document — Secondary reference
9170796-1Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 79NC4-40?
79NC4-40 is a NUT,SELF-LOCKING,CLINCH.
What parts can replace 79NC4-40?
There are 2 known substitutes for 79NC4-40: 2532993-28, 9170796-1. Substitute compatibility should be verified for your specific system.
What is the NSN for 79NC4-40?
79NC4-40 is cataloged in the U.S. Government catalog under NSN 5310-00-836-7674. 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.