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Technical Data Sheet
PartsTable / COMPONENT / 540336.503//C
540336.503//C ✓ 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 540336.503//C is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-207-9364, 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
540336.503//C
NSN: 5310-00-207-9364
FSC: 5310
CAGE: A0069 — LEONARDO S.P.A. SECURITY & INFORMATION SYSTEM DIVISION (ITA)
SPECIFICATIONS
Part Number540336.503//C
NSN5310-00-207-9364
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 540336.503//C · 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 CLASS: 3B
•
SURFACE TREATMENT: CADMIUM NUT
•
MATERIAL: COPPER ALLOY NUT
•
WIDTH ACROSS FLATS: 0.153 INCHES MINIMUM AND 0.158 INCHES MAXIMUM IN
•
NOMINAL THREAD SIZE: 0.086 INCHES IN
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
THREAD QUANTITY PER INCH: 56
TECHNICAL CHARACTERISTICS (FLIS)
THREAD CLASS3B
SURFACE TREATMENTCADMIUM NUT
MATERIALCOPPER ALLOY NUT
WIDTH ACROSS FLATS0.153 INCHES MINIMUM AND 0.158 INCHES MAXIMUM IN
NOMINAL THREAD SIZE0.086 INCHES IN
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
THREAD QUANTITY PER INCH56
MATERIALPLASTIC LOCKING INSERT
LOCKING FEATUREPREVAILING TORQUE WITH NONMETALLIC INSERT
NUT HEIGHT0.085 INCHES MINIMUM AND 0.105 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 17
5998PL1582569Interchangeable
interchangeable cross-reference
interchangeable
101496Interchangeable
interchangeable cross-reference
interchangeable
570412Interchangeable
interchangeable cross-reference
interchangeable
641-3Interchangeable
interchangeable cross-reference
interchangeable
2921066-003Interchangeable
interchangeable cross-reference
interchangeable
F12674-3Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 540336.503//C?
540336.503//C is a 540336.503//C.
What parts can replace 540336.503//C?
There are 17 known substitutes for 540336.503//C: 5998PL1582569, 101496, 570412 and 14 more. Substitute compatibility should be verified for your specific system.
Is 540336.503//C still available?
540336.503//C 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