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MS51943-9 — Technical Data Sheet

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— · 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: PLASTIC POLYAMIDE NYLON LOCKING INSERT, nut_style: HEXAGON, nut_height: 0.427 INCHES MINIMUM AND 0.609 INCHES MAXIMUM IN, temp_rating: 250.0 FAHRENHEIT MAXIMUM DEGF, thread_class: 3B, thread_series: UNIFIED NATIONAL COARSE (UNC). This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System under NSN 5310-01-231-7459, 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
MS51943-9
NSN: 5310-01-231-7459
FSC: 5310
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialPLASTIC POLYAMIDE NYLON LOCKING INSERT
nut_styleHEXAGON
nut_height0.427 INCHES MINIMUM AND 0.609 INCHES MAXIMUM IN
temp_rating250.0 FAHRENHEIT MAXIMUM DEGF
thread_class3B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
locking_featurePREVAILING TORQUE WITH NONMETALLIC INSERT
thread_directionRIGHT-HAND
surface_treatmentPHOSPHATE NUT
width_across_flats0.736 INCHES MINIMUM AND 0.752 INCHES MAXIMUM IN
nominal_thread_size0.500 INCHES IN
bearing_surface_typeCHAMFERED
NSN5310-01-231-7459
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MS51943-9 · 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
•
NUT HEIGHT: 0.427 INCHES MINIMUM AND 0.609 INCHES MAXIMUM IN
•
NUT STYLE: HEXAGON
•
THREAD DIRECTION: RIGHT-HAND
•
MATERIAL: PLASTIC POLYAMIDE NYLON LOCKING INSERT
•
NOMINAL THREAD SIZE: 0.500 INCHES IN
•
WIDTH ACROSS FLATS: 0.736 INCHES MINIMUM AND 0.752 INCHES MAXIMUM IN
•
THREAD QUANTITY PER INCH: 13
•
BEARING SURFACE TYPE: CHAMFERED
TECHNICAL CHARACTERISTICS
NUT HEIGHT0.427 INCHES MINIMUM AND 0.609 INCHES MAXIMUM IN
NUT STYLEHEXAGON
THREAD DIRECTIONRIGHT-HAND
MATERIALPLASTIC POLYAMIDE NYLON LOCKING INSERT
NOMINAL THREAD SIZE0.500 INCHES IN
WIDTH ACROSS FLATS0.736 INCHES MINIMUM AND 0.752 INCHES MAXIMUM IN
THREAD QUANTITY PER INCH13
BEARING SURFACE TYPECHAMFERED
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
END ITEM IDENTIFICATIONA4 BRADLEY FIGHTING VEHICLE; A3 BRADLEY FIGHTING VEHICLE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
MS51943-4InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
5310PL0918864InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
M45913/3-5FG8PInterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
MIL-DTL-45913InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
MS51943-57InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
M45913/3-24FG8CInterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVEGOVERNMENT REGISTRY
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS51943-9?
MS51943-9 is a NUT,SELF-LOCKING,HEXAGON.
What parts can replace MS51943-9?
There are 21 known substitutes for MS51943-9: MS51943-4, 5310PL0918864, M45913/3-5FG8P and 18 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MS51943-9?
MS51943-9 is cataloged in the Federal Logistics Information System under NSN 5310-01-231-7459. 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: October 2026