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LL66C428C — NUT,SELF-LOCKING,PLATE

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

LL66C428C: NUT,SELF-LOCKING,PLATE.

The NUT,SELF-LOCKING,PLATE is a the manufacturer industrial component. Key specifications include material: STEEL COMP 321 OR STEEL COMP 303F OVERALL, nut_style: PLATE, nut_height: 0.351 INCHES NOMINAL IN, nut_length: 1.300 INCHES NOMINAL IN, plate_width: 0.516 INCHES NOMINAL IN, temp_rating: 1200.0 FAHRENHEIT NOMINAL DEGF. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-078-8610, 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
LL66C428C
NSN: 5310-00-078-8610
FSC: 5310 — Nuts and Washers
CAGE: 52828 — REPUBLIC FASTENER MFG. CORP. DBA ARCONIC FASTENING SYSTEMS (USA)
SPECIFICATIONS
materialSTEEL COMP 321 OR STEEL COMP 303F OVERALL
nut_stylePLATE
nut_height0.351 INCHES NOMINAL IN
nut_length1.300 INCHES NOMINAL IN
plate_width0.516 INCHES NOMINAL IN
temp_rating1200.0 FAHRENHEIT NOMINAL DEGF
thread_class3B
thread_seriesUNF
locking_featurePREVAILING TORQUE ALL METAL DESIGN
plate_thickness0.031 INCHES NOMINAL IN
thread_directionRIGHT-HAND
features_providedFLOATING NUT
NSN5310-00-078-8610
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: LL66C428C · 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
•
PLATE THICKNESS: 0.031 INCHES NOMINAL IN
•
NUT LENGTH: 1.300 INCHES NOMINAL IN
•
THREAD SERIES: UNF
•
PRECIOUS MATERIAL: SILVER
•
PLATE WIDTH: 0.516 INCHES NOMINAL IN
•
TEMP RATING: 1200.0 FAHRENHEIT NOMINAL DEGF
•
MOUNTING HOLE ARRANGEMENT STYLE: 2 HOLES
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5510 ASSN STD 1ST MATERIAL RESPONSE OR AMS 5642 ASSN STD 2ND MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS
PLATE THICKNESS0.031 INCHES NOMINAL IN
NUT LENGTH1.300 INCHES NOMINAL IN
THREAD SERIESUNF
PRECIOUS MATERIALSILVER
PLATE WIDTH0.516 INCHES NOMINAL IN
TEMP RATING1200.0 FAHRENHEIT NOMINAL DEGF
MOUNTING HOLE ARRANGEMENT STYLE2 HOLES
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5510 ASSN STD 1ST MATERIAL RESPONSE OR AMS 5642 ASSN STD 2ND MATERIAL RESPONSE OVERALL
MOUNTING HOLE DIAMETER0.098 INCHES MINIMUM AND 0.103 INCHES MAXIMUM IN
FEATURES PROVIDEDFLOATING NUT
OTHER ITEMS IN FSC 5310 — Nuts and Washers
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5310-00-000-0040 5310-00-000-0077 5310-00-000-0079 5310-00-000-1146 5310-00-000-3815 5310-00-000-4532 5310-00-000-4540
SUBSTITUTES & CROSS-REFERENCES 2
LHA8580-048Reference document
Same NSN cross-reference
Reference document — Secondary reference
3M148-4Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is LL66C428C?
LL66C428C is a NUT,SELF-LOCKING,PLATE.
What parts can replace LL66C428C?
There are 2 known substitutes for LL66C428C: LHA8580-048, 3M148-4. Substitute compatibility should be verified for your specific system.
What is the NSN for LL66C428C?
LL66C428C is cataloged in the U.S. Government catalog under NSN 5310-00-078-8610. 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.