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Technical Data Sheet
PartsTable / COMPONENT / MS51943-57
MS51943-57 ✓ 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: 1.245 INCHES MINIMUM AND 1.671 INCHES MAXIMUM IN, temp_rating: 250.0 FAHRENHEIT NOMINAL DEGF, thread_class: 3B, thread_series: UNEF. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-032-2319, 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
MS51943-57
NSN: 5310-01-032-2319
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_height1.245 INCHES MINIMUM AND 1.671 INCHES MAXIMUM IN
temp_rating250.0 FAHRENHEIT NOMINAL DEGF
thread_class3B
thread_seriesUNEF
locking_featurePREVAILING TORQUE WITH NONMETALLIC INSERT
thread_directionRIGHT-HAND
surface_treatmentCADMIUM OVERALL EXCEPT INSERT
width_across_flats2.175 INCHES MINIMUM AND 2.252 INCHES MAXIMUM IN
nominal_thread_size1.500 INCHES IN
bearing_surface_typeCHAMFERED OR WASHER FACED
NSN5310-01-032-2319
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MS51943-57 · 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
•
WIDTH ACROSS FLATS: 2.175 INCHES MINIMUM AND 2.252 INCHES MAXIMUM IN
•
NUT HEIGHT: 1.245 INCHES MINIMUM AND 1.671 INCHES MAXIMUM IN
•
TEMP RATING: 250.0 FAHRENHEIT NOMINAL DEGF
•
BEARING SURFACE TYPE: CHAMFERED OR WASHER FACED
•
NOMINAL THREAD SIZE: 1.500 INCHES IN
•
MATERIAL: PLASTIC POLYAMIDE NYLON LOCKING INSERT
•
SURFACE TREATMENT: CADMIUM OVERALL EXCEPT INSERT
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL EXCEPT INSERT
TECHNICAL CHARACTERISTICS (FLIS)
WIDTH ACROSS FLATS2.175 INCHES MINIMUM AND 2.252 INCHES MAXIMUM IN
NUT HEIGHT1.245 INCHES MINIMUM AND 1.671 INCHES MAXIMUM IN
TEMP RATING250.0 FAHRENHEIT NOMINAL DEGF
BEARING SURFACE TYPECHAMFERED OR WASHER FACED
NOMINAL THREAD SIZE1.500 INCHES IN
MATERIALPLASTIC POLYAMIDE NYLON LOCKING INSERT
SURFACE TREATMENTCADMIUM OVERALL EXCEPT INSERT
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL EXCEPT INSERT
THREAD SERIESUNEF
NUT STYLEHEXAGON
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
MS51943-4Interchangeable
interchangeable cross-reference
interchangeable
5310PL0918864Interchangeable
interchangeable cross-reference
interchangeable
M45913/3-5FG8PInterchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-45913Interchangeable
interchangeable cross-reference
interchangeable
MS51943-9Interchangeable
interchangeable cross-reference
interchangeable
M45913/3-8CG8PInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS51943-57?
MS51943-57 is a NUT,SELF-LOCKING,HEXAGON.
What parts can replace MS51943-57?
There are 21 known substitutes for MS51943-57: MS51943-4, 5310PL0918864, M45913/3-5FG8P and 18 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MS51943-57?
MS51943-57 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-032-2319. 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