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Technical Data Sheet
PartsTable / COMPONENT / MS21045-4S
MS21045-4S ✓ 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 NUT,SELF-LOCKING,HEXAGON is a the manufacturer industrial component. Key specifications include nut_height: 0.240 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN, lubrication: SOLUBLE LUBRICANT, temp_rating: 450.0 FAHRENHEIT NOMINAL DEGF, thread_class: 3B, thread_series: UNIFIED NATIONAL JOINT FINE (UNJF), locking_feature: PREVAILING TORQUE ALL METAL DESIGN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-473-1810, 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
MS21045-4S
NSN: 5310-01-473-1810
FSC: 5310
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
nut_height0.240 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN
lubricationSOLUBLE LUBRICANT
temp_rating450.0 FAHRENHEIT NOMINAL DEGF
thread_class3B
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF)
locking_featurePREVAILING TORQUE ALL METAL DESIGN
thread_directionRIGHT-HAND
surface_treatmentCADMIUM OVERALL
width_across_flats0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN
nominal_thread_size0.250 INCHES IN
bearing_surface_typeCHAMFERED OR WASHER FACED
bearing_surface_finish125.0 MICROINCHES
NSN5310-01-473-1810
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MS21045-4S · 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
•
NOMINAL THREAD SIZE: 0.250 INCHES IN
•
BEARING SURFACE FINISH: 125.0 MICROINCHES
•
BEARING SURFACE TYPE: CHAMFERED OR WASHER FACED
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TYPE II,CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
SURFACE TREATMENT: CADMIUM OVERALL
•
MATERIAL: STEEL COMP 1008 OR STEEL COMP 1010 OR STEEL COMP 1015 OR STEEL COMP 1018 OR STEEL COMP 1021 OR STEEL COMP 1022 OR STEEL COMP 1030 OR STEEL COMP 1035 OR STEEL COMP 1045 OR STEEL COMP 1110 OR STEEL COMP 1117 OR STEEL COMP 1118 OR STEEL COMP 1137 OR STEEL COMP 1213 OR STEEL COMP 8740 OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM A29 ASSN STD 1ST MATERIAL RESPONSE OR AMS 5050 ASSN STD 2ND MATERIAL RESPONSE OR AMS 5060 ASSN STD 3RD MATERIAL RESPONSE OR AMS 5069 ASSN STD 4TH MATERIAL RESPONSE OR AMS 5070 ASSN STD 5TH MATERIAL RESPONSE OR AMS 5080 ASSN STD 5TH MATERIAL RESPONSE OR AMS 5022 ASSN STD 7TH MATERIAL RESPONSE OR AMS 5024 ASSN STD 8TH MATERIAL RESPONSE OR AMS 5020 ASSN STD 9TH MATERIAL RESPONSE OR AMS 6322 ASSN STD 10TH MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.250 INCHES IN
BEARING SURFACE FINISH125.0 MICROINCHES
BEARING SURFACE TYPECHAMFERED OR WASHER FACED
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TYPE II,CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
SURFACE TREATMENTCADMIUM OVERALL
MATERIALSTEEL COMP 1008 OR STEEL COMP 1010 OR STEEL COMP 1015 OR STEEL COMP 1018 OR STEEL COMP 1021 OR STEEL COMP 1022 OR STEEL COMP 1030 OR STEEL COMP 1035 OR STEEL COMP 1045 OR STEEL COMP 1110 OR STEEL COMP 1117 OR STEEL COMP 1118 OR STEEL COMP 1137 OR STEEL COMP 1213 OR STEEL COMP 8740 OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A29 ASSN STD 1ST MATERIAL RESPONSE OR AMS 5050 ASSN STD 2ND MATERIAL RESPONSE OR AMS 5060 ASSN STD 3RD MATERIAL RESPONSE OR AMS 5069 ASSN STD 4TH MATERIAL RESPONSE OR AMS 5070 ASSN STD 5TH MATERIAL RESPONSE OR AMS 5080 ASSN STD 5TH MATERIAL RESPONSE OR AMS 5022 ASSN STD 7TH MATERIAL RESPONSE OR AMS 5024 ASSN STD 8TH MATERIAL RESPONSE OR AMS 5020 ASSN STD 9TH MATERIAL RESPONSE OR AMS 6322 ASSN STD 10TH MATERIAL RESPONSE OVERALL
THREAD SERIESUNIFIED NATIONAL JOINT FINE (UNJF)
END ITEM IDENTIFICATION6115013172139
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
SM1813-40Interchangeable
interchangeable cross-reference
interchangeable
50FA440Interchangeable
interchangeable cross-reference
interchangeable
58FH440Interchangeable
interchangeable cross-reference
interchangeable
NASM21045Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS21045-4S?
MS21045-4S is a NUT,SELF-LOCKING,HEXAGON.
What parts can replace MS21045-4S?
There are 4 known substitutes for MS21045-4S: SM1813-40, 50FA440, 58FH440 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MS21045-4S?
MS21045-4S is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-473-1810. 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