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PartsTable / COMPONENT / LS9660C6
LS9660C6 ✓ 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 WASHER,FLAT is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-531-9514, 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
LS9660C6
NSN: 5310-00-531-9514
FSC: 5310
CAGE: 98897 — LOCKHEED MARTIN CORP (USA)
SPECIFICATIONS
Part NumberLS9660C6
NSN5310-00-531-9514
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: LS9660C6 · 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 30
399163-184Interchangeable
interchangeable cross-reference
interchangeable
100548-01Interchangeable
interchangeable cross-reference
interchangeable
355-042-002Interchangeable
interchangeable cross-reference
interchangeable
0904007-2Interchangeable
interchangeable cross-reference
interchangeable
103415Interchangeable
interchangeable cross-reference
interchangeable
SFP190AInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is LS9660C6?
LS9660C6 is a WASHER,FLAT.
What parts can replace LS9660C6?
There are 30 known substitutes for LS9660C6: 399163-184, 100548-01, 355-042-002 and 27 more. Substitute compatibility should be verified for your specific system.
Is LS9660C6 still available?
LS9660C6 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