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C646-10 — NUT,CLIP-ON

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

C646-10: NUT,CLIP-ON.

The NUT,CLIP-ON is a the manufacturer industrial component. Key specifications include material: STEEL SHELL, thread_class: 3B3B, overall_width: 0.460 INCHES NOMINAL0.460 INCHES NOMINAL IN, thread_series: UNFUNF, panel_thickness: 0.300 INCHES NOMINAL0.300 INCHES NOMINAL IN, thread_direction: RIGHT-HANDRIGHT-HAND. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-917-4559, 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
C646-10
NSN: 5310-00-917-4559
FSC: 5310 — Nuts and Washers
CAGE: 52828 — REPUBLIC FASTENER MFG. CORP. DBA ARCONIC FASTENING SYSTEMS (USA)
SPECIFICATIONS
materialSTEEL SHELL
thread_class3B3B
overall_width0.460 INCHES NOMINAL0.460 INCHES NOMINAL IN
thread_seriesUNFUNF
panel_thickness0.300 INCHES NOMINAL0.300 INCHES NOMINAL IN
thread_directionRIGHT-HANDRIGHT-HAND
surface_treatmentCADMIUM OVERALL
nominal_thread_size0.190 INCHES0.190 INCHES IN
thread_quantity_per_inch3232
distance_from_base_to_center_of_aperture0.580 INCHES NOMINAL0.580 INCHES NOMINAL IN
surface_treatment_document_and_classificationQQ-P-416 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5310-00-917-4559
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: C646-10 · 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
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD SERIES: UNFUNF
•
DISTANCE FROM BASE TO CENTER OF APERTURE: 0.580 INCHES NOMINAL0.580 INCHES NOMINAL IN
•
THREAD DIRECTION: RIGHT-HANDRIGHT-HAND
•
PANEL THICKNESS: 0.300 INCHES NOMINAL0.300 INCHES NOMINAL IN
•
NOMINAL THREAD SIZE: 0.190 INCHES0.190 INCHES IN
•
SURFACE TREATMENT: CADMIUM OVERALL
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD SERIESUNFUNF
DISTANCE FROM BASE TO CENTER OF APERTURE0.580 INCHES NOMINAL0.580 INCHES NOMINAL IN
OVERALL WIDTH0.460 INCHES NOMINAL0.460 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HANDRIGHT-HAND
PANEL THICKNESS0.300 INCHES NOMINAL0.300 INCHES NOMINAL IN
NOMINAL THREAD SIZE0.190 INCHES0.190 INCHES IN
SURFACE TREATMENTCADMIUM OVERALL
THREAD CLASS3B3B
THREAD QUANTITY PER INCH3232
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 1
SL100-10Reference 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 C646-10?
C646-10 is a NUT,CLIP-ON.
What parts can replace C646-10?
There is 1 known substitute for C646-10: SL100-10. Substitute compatibility should be verified for your specific system.
What is the NSN for C646-10?
C646-10 is cataloged in the U.S. Government catalog under NSN 5310-00-917-4559. 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.