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Technical Data Sheet
PartsTable / COMPONENT / M45913/3-4CG8C
M45913/3-4CG8C ✓ 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 M45913/3-4CG8C is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-061-4650, 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
M45913/3-4CG8C
NSN: 5310-00-061-4650
FSC: 5310
CAGE: 80205 — NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE (USA)
SPECIFICATIONS
Part NumberM45913/3-4CG8C
NSN5310-00-061-4650
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: M45913/3-4CG8C · 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
•
LOCKING FEATURE: PREVAILING TORQUE WITH NONMETALLIC INSERT
•
THREAD QUANTITY PER INCH: 20
•
TEMP RATING: 250.0 FAHRENHEIT NOMINAL DEGF
•
HARDNESS RATING: 26.0 ROCKWELL C MINIMUM AND 35.0 ROCKWELL C MAXIMUM
•
WIDTH ACROSS FLATS: 0.428 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
NOMINAL THREAD SIZE: 0.250 INCHES IN
TECHNICAL CHARACTERISTICS (FLIS)
LOCKING FEATUREPREVAILING TORQUE WITH NONMETALLIC INSERT
THREAD QUANTITY PER INCH20
TEMP RATING250.0 FAHRENHEIT NOMINAL DEGF
HARDNESS RATING26.0 ROCKWELL C MINIMUM AND 35.0 ROCKWELL C MAXIMUM
WIDTH ACROSS FLATS0.428 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
END ITEM IDENTIFICATIONMRAP - COUGAR TOW
NOMINAL THREAD SIZE0.250 INCHES IN
BEARING SURFACE TYPECHAMFERED OR WASHER FACED
THREAD CLASS3B
VERIFIED SUBSTITUTES & CROSS-REFERENCES 19
5210113 PART 152Interchangeable
interchangeable cross-reference
interchangeable
12387349-43Interchangeable
interchangeable cross-reference
interchangeable
5210114 PART 152Interchangeable
interchangeable cross-reference
interchangeable
M45913/3-9FG8CInterchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-45913CInterchangeable
interchangeable cross-reference
interchangeable
MS51943-42Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is M45913/3-4CG8C?
M45913/3-4CG8C is a M45913/3-4CG8C.
What parts can replace M45913/3-4CG8C?
There are 19 known substitutes for M45913/3-4CG8C: 5210113 PART 152, 12387349-43, 5210114 PART 152 and 16 more. Substitute compatibility should be verified for your specific system.
Is M45913/3-4CG8C still available?
M45913/3-4CG8C 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