PartsTable
Technical Data Sheet
751-6402408 ITEM 61 ✓ 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: NICKEL ALLOY OVERALL, nut_style: HEXAGON, nut_height: 0.710 INCHES MINIMUM AND 0.758 INCHES MAXIMUM IN, thread_class: 3B, thread_series: UNIFIED NATIONAL COARSE (UNC), locking_feature: PREVAILING TORQUE ALL METAL DESIGN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-445-1522, 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
751-6402408 ITEM 61
NSN: 5310-01-445-1522
FSC: 5310
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
materialNICKEL ALLOY OVERALL
nut_styleHEXAGON
nut_height0.710 INCHES MINIMUM AND 0.758 INCHES MAXIMUM IN
thread_class3B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
locking_featurePREVAILING TORQUE ALL METAL DESIGN
thread_directionRIGHT-HAND
width_across_flats1.212 INCHES MINIMUM AND 1.250 INCHES MAXIMUM IN
nominal_thread_size0.750 INCHES IN
thread_quantity_per_inch10
NSN5310-01-445-1522
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 751-6402408 ITEM 61 · 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 STYLE: HEXAGON
THREAD DIRECTION: RIGHT-HAND
NUT HEIGHT: 0.710 INCHES MINIMUM AND 0.758 INCHES MAXIMUM IN
NOMINAL THREAD SIZE: 0.750 INCHES IN
LOCKING FEATURE: PREVAILING TORQUE ALL METAL DESIGN
THREAD QUANTITY PER INCH: 10
THREAD CLASS: 3B
WIDTH ACROSS FLATS: 1.212 INCHES MINIMUM AND 1.250 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
NUT STYLEHEXAGON
THREAD DIRECTIONRIGHT-HAND
NUT HEIGHT0.710 INCHES MINIMUM AND 0.758 INCHES MAXIMUM IN
NOMINAL THREAD SIZE0.750 INCHES IN
LOCKING FEATUREPREVAILING TORQUE ALL METAL DESIGN
THREAD QUANTITY PER INCH10
THREAD CLASS3B
WIDTH ACROSS FLATS1.212 INCHES MINIMUM AND 1.250 INCHES MAXIMUM IN
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
MATERIALNICKEL ALLOY OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
MS1782812C(MOD)Interchangeable
interchangeable cross-reference
interchangeable
MS1782812CInterchangeable
interchangeable cross-reference
interchangeable
751-6402403-61Interchangeable
Same NIIN cross-reference
interchangeable
751-6402406 FIND 61Interchangeable
Same NIIN cross-reference
interchangeable
751-6402404 ITEM 61Interchangeable
Same NIIN cross-reference
interchangeable
751-6402405 FIND 61Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 751-6402408 ITEM 61?
751-6402408 ITEM 61 is a NUT,SELF-LOCKING,HEXAGON.
What parts can replace 751-6402408 ITEM 61?
There are 10 known substitutes for 751-6402408 ITEM 61: MS1782812C(MOD), MS1782812C, 751-6402403-61 and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 751-6402408 ITEM 61?
751-6402408 ITEM 61 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-445-1522. This indicates validated use in U.S. government and defense supply chains.
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