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Technical Data Sheet
PartsTable / COMPONENT / SMB503325-9
SMB503325-9 ✓ 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 CORROSION RESISTING OVERALL, nut_height: 0.218 INCHES NOMINAL IN, thread_class: 3B, thread_series: UNS, thread_direction: RIGHT-HAND, width_across_flats: 0.625 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-972-8763, 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
SMB503325-9
NSN: 5310-00-972-8763
FSC: 5310
CAGE: 80063 — US ARMY COMMUNICATIONS & ELECTRONICS MATERIEL READINESS COMMAND LOGISTICS ENGINEERING DIR (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
nut_height0.218 INCHES NOMINAL IN
thread_class3B
thread_seriesUNS
thread_directionRIGHT-HAND
width_across_flats0.625 INCHES NOMINAL IN
nominal_thread_size0.500 INCHES IN
thread_quantity_per_inch32
NSN5310-00-972-8763
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: SMB503325-9 · 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
•
THREAD CLASS: 3B
•
NOMINAL THREAD SIZE: 0.500 INCHES IN
•
THREAD SERIES: UNS
•
THREAD QUANTITY PER INCH: 32
•
NUT HEIGHT: 0.218 INCHES NOMINAL IN
•
MATERIAL: STEEL CORROSION RESISTING OVERALL
•
WIDTH ACROSS FLATS: 0.625 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD DIRECTIONRIGHT-HAND
THREAD CLASS3B
NOMINAL THREAD SIZE0.500 INCHES IN
THREAD SERIESUNS
THREAD QUANTITY PER INCH32
NUT HEIGHT0.218 INCHES NOMINAL IN
MATERIALSTEEL CORROSION RESISTING OVERALL
WIDTH ACROSS FLATS0.625 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
633266-5Interchangeable
interchangeable cross-reference
interchangeable
164890Interchangeable
interchangeable cross-reference
interchangeable
FL8366Interchangeable
interchangeable cross-reference
interchangeable
A554-389Interchangeable
Same NIIN cross-reference
interchangeable
N-9063-0.250Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is SMB503325-9?
SMB503325-9 is a NUT,PLAIN,HEXAGON.
What parts can replace SMB503325-9?
There are 5 known substitutes for SMB503325-9: 633266-5, 164890, FL8366 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for SMB503325-9?
SMB503325-9 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-972-8763. 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