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PartsTable / COMPONENT / 10121318
10121318 ✓ 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,SLOTTED,HEXAGON is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, nut_style: SLOTTED, HEXAGON, nut_height: 0.188 INCHES NOMINAL IN, temp_rating: 450.0 FAHRENHEIT NOMINAL DEGF, thread_class: 3B, thread_series: UNIFIED NATIONAL JOINT FINE (UNJF). This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-354-5413, 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
10121318
NSN: 5310-00-354-5413
FSC: 5310
CAGE: A486G — NIMIKKEISTOKESKUS NCB FINLAND (FIN)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleSLOTTED, HEXAGON
nut_height0.188 INCHES NOMINAL IN
temp_rating450.0 FAHRENHEIT NOMINAL DEGF
thread_class3B
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF)
hardness_rating27.0 ROCKWELL C MINIMUM AND 33.0 ROCKWELL C MAXIMUM
special_featuresDYED ORANGE
thread_directionRIGHT-HAND
countersink_angle110.0 DEGREES NOMINAL NUT
surface_treatmentCADMIUM AND CHROMATE OVERALL
width_across_flats0.428 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN
NSN5310-00-354-5413
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 10121318 · 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 DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.250 INCHES IN
•
HARDNESS RATING: 27.0 ROCKWELL C MINIMUM AND 33.0 ROCKWELL C MAXIMUM
•
THREAD SERIES: UNIFIED NATIONAL JOINT FINE (UNJF)
•
NUT HEIGHT: 0.188 INCHES NOMINAL IN
•
WIDTH ACROSS FLATS: 0.428 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN
•
THREAD QUANTITY PER INCH: 28
•
NUT STYLE: SLOTTED, HEXAGON
TECHNICAL CHARACTERISTICS (FLIS)
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.250 INCHES IN
HARDNESS RATING27.0 ROCKWELL C MINIMUM AND 33.0 ROCKWELL C MAXIMUM
THREAD SERIESUNIFIED NATIONAL JOINT FINE (UNJF)
NUT HEIGHT0.188 INCHES NOMINAL IN
WIDTH ACROSS FLATS0.428 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN
THREAD QUANTITY PER INCH28
NUT STYLESLOTTED, HEXAGON
TEMP RATING450.0 FAHRENHEIT NOMINAL DEGF
THREAD CLASS3B
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
D55342K07B750JRInterchangeable
interchangeable cross-reference
interchangeable
746404Interchangeable
interchangeable cross-reference
interchangeable
D55342K07B750JMInterchangeable
interchangeable cross-reference
interchangeable
7464 REV C ITEM NO. 4Interchangeable
interchangeable cross-reference
interchangeable
7464Interchangeable
interchangeable cross-reference
interchangeable
ST3M404-4Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 10121318?
10121318 is a NUT,PLAIN,SLOTTED,HEXAGON.
What parts can replace 10121318?
There are 8 known substitutes for 10121318: D55342K07B750JR, 746404, D55342K07B750JM and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 10121318?
10121318 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-354-5413. 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