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PartsTable / COMPONENT / M45913/1-4FS3
M45913/1-4FS3 ✓ 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 M45913/1-4FS3 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 5310-00-143-6102, 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
M45913/1-4FS3
NSN: 5310-00-143-6102
FSC: 5310
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
Part NumberM45913/1-4FS3
NSN5310-00-143-6102
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: M45913/1-4FS3 · 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 DIRECTION: RIGHT-HAND
•
NUT STYLE: HEXAGON
•
MATERIAL: STEEL COMP 303 NUT
•
BEARING SURFACE FINISH: 125.0 MICROINCHES
•
NOMINAL THREAD SIZE: 0.250 INCHES IN
•
BEARING SURFACE TYPE: CHAMFERED OR WASHER FACED
•
WIDTH ACROSS FLATS: 0.428 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN
•
NUT HEIGHT: 0.298 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD DIRECTIONRIGHT-HAND
NUT STYLEHEXAGON
MATERIALSTEEL COMP 303 NUT
BEARING SURFACE FINISH125.0 MICROINCHES
NOMINAL THREAD SIZE0.250 INCHES IN
BEARING SURFACE TYPECHAMFERED OR WASHER FACED
WIDTH ACROSS FLATS0.428 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN
NUT HEIGHT0.298 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35,TY 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL EXCEPT INSERT
TEMP RATING250.0 FAHRENHEIT NOMINAL DEGF
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
107304-104Interchangeable
interchangeable cross-reference
interchangeable
1/4-28UNF-2BInterchangeable
interchangeable cross-reference
interchangeable
1-4-28UNF2BInterchangeable
interchangeable cross-reference
interchangeable
MIL-S-1222Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-1222Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-45913/1Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is M45913/1-4FS3?
M45913/1-4FS3 is a M45913/1-4FS3.
What parts can replace M45913/1-4FS3?
There are 8 known substitutes for M45913/1-4FS3: 107304-104, 1/4-28UNF-2B, 1-4-28UNF2B and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for M45913/1-4FS3?
M45913/1-4FS3 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-143-6102. 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