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Technical Data Sheet
PartsTable / COMPONENT / MS51943-8
MS51943-8 ✓ 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 material: STEEL NUT, nut_style: HEXAGON, nut_height: 0.524 INCHES MAXIMUM IN, lubrication: DRY FILM LUBRICANT, temp_rating: 250.0 FAHRENHEIT NOMINAL DEGF, thread_class: 3B. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-933-7839, 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
MS51943-8
NSN: 5310-00-933-7839
FSC: 5310
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL NUT
nut_styleHEXAGON
nut_height0.524 INCHES MAXIMUM IN
lubricationDRY FILM LUBRICANT
temp_rating250.0 FAHRENHEIT NOMINAL DEGF
thread_class3B
thread_seriesUNF
hardness_rating26.0 ROCKWELL C MINIMUM AND 35.0 ROCKWELL C MAXIMUM
locking_featurePREVAILING TORQUE WITH NONMETALLIC INSERT
thread_directionRIGHT-HAND
surface_treatmentCADMIUM OR PHOSPHATE ZINC OVERALL EXCEPT INSERT
width_across_flats0.675 INCHES MINIMUM AND 0.690 INCHES MAXIMUM IN
NSN5310-00-933-7839
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MS51943-8 · 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 SERIES: UNF
•
THREAD DIRECTION: RIGHT-HAND
•
NUT HEIGHT: 0.524 INCHES MAXIMUM IN
•
WIDTH ACROSS FLATS: 0.675 INCHES MINIMUM AND 0.690 INCHES MAXIMUM IN
•
NOMINAL THREAD SIZE: 0.438 INCHES IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TYPE 2,CLASS 3 FED SPEC 1ST TREATMENT RESPONSE OR MIL-P-16232,TYPE Z,CLASS 2 MIL SPEC 2ND TREATMENT RESPONSE OVERALL EXCEPT INSERT
•
LUBRICATION: DRY FILM LUBRICANT
•
MATERIAL: PLASTIC LOCKING INSERT
TECHNICAL CHARACTERISTICS (FLIS)
THREAD SERIESUNF
THREAD DIRECTIONRIGHT-HAND
NUT HEIGHT0.524 INCHES MAXIMUM IN
WIDTH ACROSS FLATS0.675 INCHES MINIMUM AND 0.690 INCHES MAXIMUM IN
NOMINAL THREAD SIZE0.438 INCHES IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TYPE 2,CLASS 3 FED SPEC 1ST TREATMENT RESPONSE OR MIL-P-16232,TYPE Z,CLASS 2 MIL SPEC 2ND TREATMENT RESPONSE OVERALL EXCEPT INSERT
LUBRICATIONDRY FILM LUBRICANT
MATERIALPLASTIC LOCKING INSERT
SURFACE TREATMENTCADMIUM OR PHOSPHATE ZINC OVERALL EXCEPT INSERT
BEARING SURFACE TYPECHAMFERED OR WASHER FACED
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
5310PL0773984Interchangeable
interchangeable cross-reference
interchangeable
MS51943-34Interchangeable
interchangeable cross-reference
interchangeable
71143-34Interchangeable
interchangeable cross-reference
interchangeable
5210114 PART 153Interchangeable
interchangeable cross-reference
interchangeable
5310PL0645410Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-45913/3A-M45913/3-12CG8Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS51943-8?
MS51943-8 is a NUT,SELF-LOCKING,HEXAGON.
What parts can replace MS51943-8?
There are 11 known substitutes for MS51943-8: 5310PL0773984, MS51943-34, 71143-34 and 8 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MS51943-8?
MS51943-8 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-933-7839. 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