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Technical Data Sheet
PartsTable / COMPONENT / 50FM256
50FM256 ✓ 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. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-838-2956, 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
50FM256
NSN: 5310-00-838-2956
FSC: 5310
CAGE: 56878 — SPS TECHNOLOGIES, LLC DBA PB FASTENERS (USA)
SPECIFICATIONS
Part Number50FM256
NSN5310-00-838-2956
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 50FM256 · 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
93479Interchangeable
interchangeable cross-reference
interchangeable
141579-0002Interchangeable
interchangeable cross-reference
interchangeable
141579-0001Interchangeable
interchangeable cross-reference
interchangeable
5225021Interchangeable
interchangeable cross-reference
interchangeable
7363021Interchangeable
interchangeable cross-reference
interchangeable
10121752Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 50FM256?
50FM256 is a NUT,SELF-LOCKING,HEXAGON.
What parts can replace 50FM256?
There are 6 known substitutes for 50FM256: 93479, 141579-0002, 141579-0001 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 50FM256?
50FM256 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-838-2956. 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