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Technical Data Sheet
PartsTable / COMPONENT / MS21043-04
MS21043-04 ✓ 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 material: IRON ALLOY 660 OVERALL, nut_style: HEXAGON, lubrication: SOLUBLE LUBRICANT, temp_rating: 800.0 FAHRENHEIT NOMINAL DEGF, thread_class: 3B, thread_series: UNJC. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-878-3292, 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
MS21043-04
NSN: 5310-00-878-3292
FSC: 5310
CAGE: 80205 — NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE (USA)
SPECIFICATIONS
materialIRON ALLOY 660 OVERALL
nut_styleHEXAGON
lubricationSOLUBLE LUBRICANT
temp_rating800.0 FAHRENHEIT NOMINAL DEGF
thread_class3B
thread_seriesUNJC
overall_height0.103 INCHES MINIMUM AND 0.125 INCHES MAXIMUM IN
locking_featurePREVAILING TORQUE ALL METAL DESIGN
thread_directionRIGHT-HAND
washer_thickness0.010 INCHES MINIMUM IN
precious_materialSILVER
surface_treatmentSILVER OVERALL
NSN5310-00-878-3292
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MS21043-04 · 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 OUTSIDE DIAMETER: 0.206 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5525 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5735 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
PRECIOUS MATERIAL: SILVER
•
SURFACE TREATMENT: SILVER OVERALL
•
MATERIAL: IRON ALLOY 660 OVERALL
•
PRECIOUS MATERIAL AND LOCATION: OVERALL SILVER
•
TEMP RATING: 800.0 FAHRENHEIT NOMINAL DEGF
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL HEIGHT0.103 INCHES MINIMUM AND 0.125 INCHES MAXIMUM IN
WASHER OUTSIDE DIAMETER0.206 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5525 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5735 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
PRECIOUS MATERIALSILVER
SURFACE TREATMENTSILVER OVERALL
MATERIALIRON ALLOY 660 OVERALL
PRECIOUS MATERIAL AND LOCATIONOVERALL SILVER
TEMP RATING800.0 FAHRENHEIT NOMINAL DEGF
THREAD SERIESUNJC
THREAD QUANTITY PER INCH40
VERIFIED SUBSTITUTES & CROSS-REFERENCES 14
NAS697C04Interchangeable
interchangeable cross-reference
interchangeable
10116578Interchangeable
interchangeable cross-reference
interchangeable
7007-3Interchangeable
interchangeable cross-reference
interchangeable
819962-8Interchangeable
interchangeable cross-reference
interchangeable
NAS679C04Interchangeable
interchangeable cross-reference
interchangeable
10122053Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS21043-04?
MS21043-04 is a NUT,SELF-LOCKING,EXTENDED WASHER.
What parts can replace MS21043-04?
There are 14 known substitutes for MS21043-04: NAS697C04, 10116578, 7007-3 and 11 more. Substitute compatibility should be verified for your specific system.
Is MS21043-04 still available?
MS21043-04 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