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Technical Data Sheet
PartsTable / COMPONENT / M45913/1-20FG5C
M45913/1-20FG5C ✓ 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 M45913/1-20FG5C is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-143-6145, 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
M45913/1-20FG5C
NSN: 5310-00-143-6145
FSC: 5310
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
Part NumberM45913/1-20FG5C
NSN5310-00-143-6145
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: M45913/1-20FG5C · 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: 2B
•
BEARING SURFACE TYPE: CHAMFERED OR WASHER FACED
•
NOMINAL THREAD SIZE: 1.250 INCHES IN
•
BEARING SURFACE FINISH: 125.0 MICROINCHES
•
MATERIAL: PLASTIC POLYAMIDE NYLON LOCKING INSERT
•
THREAD QUANTITY PER INCH: 12
•
NUT STYLE: HEXAGON
•
WIDTH ACROSS FLATS: 1.801 INCHES MINIMUM AND 1.815 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD CLASS2B
BEARING SURFACE TYPECHAMFERED OR WASHER FACED
NOMINAL THREAD SIZE1.250 INCHES IN
BEARING SURFACE FINISH125.0 MICROINCHES
MATERIALPLASTIC POLYAMIDE NYLON LOCKING INSERT
THREAD QUANTITY PER INCH12
NUT STYLEHEXAGON
WIDTH ACROSS FLATS1.801 INCHES MINIMUM AND 1.815 INCHES MAXIMUM IN
THREAD DIRECTIONRIGHT-HAND
NUT HEIGHT1.360 INCHES MINIMUM AND 1.422 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
42646Interchangeable
interchangeable cross-reference
interchangeable
44550Interchangeable
interchangeable cross-reference
interchangeable
M38510/20402BEAInterchangeable
interchangeable cross-reference
interchangeable
722912-50Interchangeable
interchangeable cross-reference
interchangeable
42646-1Interchangeable
interchangeable cross-reference
interchangeable
MS51922-83Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is M45913/1-20FG5C?
M45913/1-20FG5C is a M45913/1-20FG5C.
What parts can replace M45913/1-20FG5C?
There are 8 known substitutes for M45913/1-20FG5C: 42646, 44550, M38510/20402BEA and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for M45913/1-20FG5C?
M45913/1-20FG5C is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-143-6145. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026