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PartsTable / COMPONENT / 10391568
10391568 ✓ 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: 0.398 INCHES MINIMUM AND 0.446 INCHES MAXIMUM IN, thread_class: 2B, thread_series: UNIFIED NATIONAL COARSE (UNC), hardness_rating: 121.0 BRINELL STANDARD MINIMUM. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-838-1702, 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
10391568
NSN: 5310-00-838-1702
FSC: 5310
CAGE: A486G — NIMIKKEISTOKESKUS NCB FINLAND (FIN)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleHEXAGON
nut_height0.398 INCHES MINIMUM AND 0.446 INCHES MAXIMUM IN
thread_class2B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
hardness_rating121.0 BRINELL STANDARD MINIMUM
thread_directionRIGHT-HAND
surface_treatmentCADMIUM AND CHROMATE OVERALL
width_across_flats1.0880 INCHES MINIMUM AND 1.1250 INCHES MAXIMUM IN
nominal_thread_size0.750 INCHES IN
bearing_surface_typeCHAMFERED OR WASHER FACED
thread_quantity_per_inch10
NSN5310-00-838-1702
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 10391568 · 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: 1.0880 INCHES MINIMUM AND 1.1250 INCHES MAXIMUM IN
•
BEARING SURFACE TYPE: CHAMFERED OR WASHER FACED
•
THREAD QUANTITY PER INCH: 10
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
NOMINAL THREAD SIZE: 0.750 INCHES IN
•
HARDNESS RATING: 121.0 BRINELL STANDARD MINIMUM
•
MATERIAL: STEEL OVERALL
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS (FLIS)
WIDTH ACROSS FLATS1.0880 INCHES MINIMUM AND 1.1250 INCHES MAXIMUM IN
BEARING SURFACE TYPECHAMFERED OR WASHER FACED
THREAD QUANTITY PER INCH10
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
NOMINAL THREAD SIZE0.750 INCHES IN
HARDNESS RATING121.0 BRINELL STANDARD MINIMUM
MATERIALSTEEL OVERALL
THREAD DIRECTIONRIGHT-HAND
NUT STYLEHEXAGON
THREAD CLASS2B
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
104971Interchangeable
interchangeable cross-reference
interchangeable
10122091Interchangeable
interchangeable cross-reference
interchangeable
123-679Interchangeable
interchangeable cross-reference
interchangeable
T104971Interchangeable
interchangeable cross-reference
interchangeable
50420Interchangeable
interchangeable cross-reference
interchangeable
EE64105Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 10391568?
10391568 is a NUT,PLAIN,HEXAGON.
What parts can replace 10391568?
There are 11 known substitutes for 10391568: 104971, 10122091, 123-679 and 8 more. Substitute compatibility should be verified for your specific system.
Is 10391568 still available?
10391568 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026