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DX641 ✓ 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: 0.250 INCHES NOMINAL IN, thread_class: 2B, thread_series: UNF, thread_direction: RIGHT-HAND. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-141-3665, 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
DX641
NSN: 5310-00-141-3665
FSC: 5310
CAGE: 56442 — DIAMOND REO TRUCK CO (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleHEXAGON
nut_height0.250 INCHES NOMINAL IN
thread_class2B
thread_seriesUNF
thread_directionRIGHT-HAND
width_across_flats1.062 INCHES NOMINAL IN
nominal_thread_size0.750 INCHES IN
bearing_surface_typeWASHER FACED
thread_quantity_per_inch16
NSN5310-00-141-3665
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: DX641 · 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 CLASS: 2B
•
THREAD QUANTITY PER INCH: 16
•
BEARING SURFACE TYPE: WASHER FACED
•
NOMINAL THREAD SIZE: 0.750 INCHES IN
•
THREAD SERIES: UNF
•
NUT HEIGHT: 0.250 INCHES NOMINAL IN
•
NUT STYLE: HEXAGON
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS (FLIS)
THREAD CLASS2B
THREAD QUANTITY PER INCH16
BEARING SURFACE TYPEWASHER FACED
NOMINAL THREAD SIZE0.750 INCHES IN
THREAD SERIESUNF
NUT HEIGHT0.250 INCHES NOMINAL IN
NUT STYLEHEXAGON
THREAD DIRECTIONRIGHT-HAND
WIDTH ACROSS FLATS1.062 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
26298Interchangeable
interchangeable cross-reference
interchangeable
35149Interchangeable
interchangeable cross-reference
interchangeable
16TX134Interchangeable
interchangeable cross-reference
interchangeable
155346Interchangeable
interchangeable cross-reference
interchangeable
S323AInterchangeable
interchangeable cross-reference
interchangeable
353-5386Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is DX641?
DX641 is a NUT,PLAIN,HEXAGON.
What parts can replace DX641?
There are 18 known substitutes for DX641: 26298, 35149, 16TX134 and 15 more. Substitute compatibility should be verified for your specific system.
What is the NSN for DX641?
DX641 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-141-3665. 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