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Technical Data Sheet
PartsTable / COMPONENT / MS51967-4
MS51967-4 ✓ 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,PLAIN,HEXAGON is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, nut_style: HEXAGON, nut_height: 0.258 INCHES MINIMUM AND 0.273 INCHES MAXIMUM IN, thread_class: 2B, thread_series: UNIFIED NATIONAL COARSE (UNC), hardness_rating: 121.0 BRINELL STANDARD MINIMUM. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-761-1681, 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
MS51967-4
NSN: 5310-00-761-1681
FSC: 5310
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleHEXAGON
nut_height0.258 INCHES MINIMUM AND 0.273 INCHES MAXIMUM IN
thread_class2B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
hardness_rating121.0 BRINELL STANDARD MINIMUM
thread_directionRIGHT-HAND
surface_treatmentZINC OVERALL
width_across_flats0.489 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN
nominal_thread_size0.312 INCHES IN
bearing_surface_typeCHAMFERED OR WASHER FACED
end_item_identificationMRAP BUFFALO MK2A2
NSN5310-00-761-1681
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MS51967-4 · 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: 0.258 INCHES MINIMUM AND 0.273 INCHES MAXIMUM IN
•
NOMINAL THREAD SIZE: 0.312 INCHES IN
•
HARDNESS RATING: 103.0 BRINELL STANDARD MINIMUM
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
THREAD QUANTITY PER INCH: 18
•
BEARING SURFACE TYPE: CHAMFERED OR WASHER FACED
•
WIDTH ACROSS FLATS: 0.4890 INCHES MINIMUM AND 0.5000 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
NUT HEIGHT0.258 INCHES MINIMUM AND 0.273 INCHES MAXIMUM IN
NOMINAL THREAD SIZE0.312 INCHES IN
HARDNESS RATING103.0 BRINELL STANDARD MINIMUM
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
THREAD QUANTITY PER INCH18
BEARING SURFACE TYPECHAMFERED OR WASHER FACED
WIDTH ACROSS FLATS0.4890 INCHES MINIMUM AND 0.5000 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NUT STYLEHEXAGON
MATERIALSTEEL OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
16A4C2Interchangeable
interchangeable cross-reference
interchangeable
012316-8Interchangeable
interchangeable cross-reference
interchangeable
FFS836Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS51967-4?
MS51967-4 is a NUT,PLAIN,HEXAGON.
What parts can replace MS51967-4?
There are 3 known substitutes for MS51967-4: 16A4C2, 012316-8, FFS836. Substitute compatibility should be verified for your specific system.
What is the NSN for MS51967-4?
MS51967-4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-761-1681. 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