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PartsTable / COMPONENT / MS21042-3
MS21042-3 ✓ 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

NUT,SELF-LOCKING,EXTENDED WASHER. Key specifications include departure_from_cited_document: MATERIAL WILL BE IN ACCORDANCE WITH NAVSUP-WSS ACTIVITY HX QUALITY CONTROL, MANUFACTURING AND TESTING SPECIFICATIONS, criticality_code_justification: ZZZW. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-807-1467, 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
MS21042-3
NSN: 5310-00-807-1467
FSC: 5310
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
departure_from_cited_documentMATERIAL WILL BE IN ACCORDANCE WITH NAVSUP-WSS ACTIVITY HX QUALITY CONTROL, MANUFACTURING AND TESTING SPECIFICATIONS
criticality_code_justificationZZZW
NSN5310-00-807-1467
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MS21042-3 · 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
•
WASHER THICKNESS: 0.015 INCHES MINIMUM IN
•
MATERIAL: STEEL OVERALL
•
THREAD QUANTITY PER INCH: 32
•
NOMINAL THREAD SIZE: 0.190 INCHES IN
•
THREAD SERIES: UNIFIED NATIONAL JOINT FINE (UNJF)
•
HARDNESS RATING: 49.0 ROCKWELL C MAXIMUM
•
WIDTH ACROSS FLATS: 0.243 INCHES MINIMUM AND 0.252 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
WASHER THICKNESS0.015 INCHES MINIMUM IN
MATERIALSTEEL OVERALL
END ITEM IDENTIFICATIONMRAP - COUGAR
THREAD QUANTITY PER INCH32
NOMINAL THREAD SIZE0.190 INCHES IN
THREAD SERIESUNIFIED NATIONAL JOINT FINE (UNJF)
HARDNESS RATING49.0 ROCKWELL C MAXIMUM
WIDTH ACROSS FLATS0.243 INCHES MINIMUM AND 0.252 INCHES MAXIMUM IN
TEMP RATING450.0 FAHRENHEIT NOMINAL DEGF
LOCKING FEATUREPREVAILING TORQUE ALL METAL DESIGN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 16
Z00.N5415391225Interchangeable
interchangeable cross-reference
interchangeable
FN12-02Interchangeable
interchangeable cross-reference
interchangeable
5310PL0853277Interchangeable
interchangeable cross-reference
interchangeable
PM17-MInterchangeable
interchangeable cross-reference
interchangeable
1889055-1Interchangeable
interchangeable cross-reference
interchangeable
SP-66Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS21042-3?
MS21042-3 is a NUT,SELF-LOCKING,EXTENDED WASHER.
What parts can replace MS21042-3?
There are 16 known substitutes for MS21042-3: Z00.N5415391225, FN12-02, 5310PL0853277 and 13 more. Substitute compatibility should be verified for your specific system.
Is MS21042-3 still available?
MS21042-3 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