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PartsTable / COMPONENT / 50FK720
50FK720 ✓ 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: STEEL CORROSION RESISTING OVERALL, nut_style: HEXAGON, nut_height: 0.312 INCHES NOMINAL IN, thread_class: 3B, thread_series: UNF, locking_feature: PREVAILING TORQUE ALL METAL DESIGN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-515-8752, 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
50FK720
NSN: 5310-00-515-8752
FSC: 5310
CAGE: 56878 — SPS TECHNOLOGIES, LLC DBA PB FASTENERS (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
nut_styleHEXAGON
nut_height0.312 INCHES NOMINAL IN
thread_class3B
thread_seriesUNF
locking_featurePREVAILING TORQUE ALL METAL DESIGN
thread_directionRIGHT-HAND
surface_treatmentPASSIVATE OVERALL
width_across_flats0.625 INCHES NOMINAL IN
nominal_thread_size0.438 INCHES IN
bearing_surface_typeCHAMFERED
thread_quantity_per_inch20
NSN5310-00-515-8752
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 50FK720 · 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
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
NOMINAL THREAD SIZE: 0.438 INCHES IN
•
THREAD SERIES: UNF
•
BEARING SURFACE TYPE: CHAMFERED
•
THREAD QUANTITY PER INCH: 20
•
LOCKING FEATURE: PREVAILING TORQUE ALL METAL DESIGN
•
THREAD CLASS: 3B
TECHNICAL CHARACTERISTICS (FLIS)
NUT STYLEHEXAGON
SURFACE TREATMENTPASSIVATE OVERALL
NOMINAL THREAD SIZE0.438 INCHES IN
THREAD SERIESUNF
BEARING SURFACE TYPECHAMFERED
THREAD QUANTITY PER INCH20
LOCKING FEATUREPREVAILING TORQUE ALL METAL DESIGN
THREAD CLASS3B
WIDTH ACROSS FLATS0.625 INCHES NOMINAL IN
NUT HEIGHT0.312 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
80330Interchangeable
interchangeable cross-reference
interchangeable
80324Interchangeable
interchangeable cross-reference
interchangeable
4602Interchangeable
interchangeable cross-reference
interchangeable
ASP-1Interchangeable
interchangeable cross-reference
interchangeable
4602TAB-1000Interchangeable
interchangeable cross-reference
interchangeable
15S341 PIECE 10Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 50FK720?
50FK720 is a NUT,SELF-LOCKING,HEXAGON.
What parts can replace 50FK720?
There are 6 known substitutes for 50FK720: 80330, 80324, 4602 and 3 more. Substitute compatibility should be verified for your specific system.
Is 50FK720 still available?
50FK720 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026