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Technical Data Sheet
PartsTable / COMPONENT / 20X520
20X520 ✓ 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: COPPER ALLOY OVERALL, nut_style: HEXAGON, nut_height: 0.094 INCHES NOMINAL IN, thread_class: 2B, thread_series: UNEF, thread_direction: RIGHT-HAND. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-282-4653, 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
20X520
NSN: 5310-00-282-4653
FSC: 5310
CAGE: 64648 — WELLS-GARDNER ELECTRONICS CORP (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
nut_styleHEXAGON
nut_height0.094 INCHES NOMINAL IN
thread_class2B
thread_seriesUNEF
thread_directionRIGHT-HAND
surface_treatmentNICKEL OVERALL
width_across_flats0.500 INCHES NOMINAL IN
nominal_thread_size0.375 INCHES IN
bearing_surface_typeCHAMFERED
thread_quantity_per_inch32
NSN5310-00-282-4653
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 20X520 · 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 SERIES: UNEF
•
BEARING SURFACE TYPE: CHAMFERED
•
THREAD QUANTITY PER INCH: 32
•
NOMINAL THREAD SIZE: 0.375 INCHES IN
•
NUT STYLE: HEXAGON
•
WIDTH ACROSS FLATS: 0.500 INCHES NOMINAL IN
•
THREAD DIRECTION: RIGHT-HAND
•
THREAD CLASS: 2B
TECHNICAL CHARACTERISTICS (FLIS)
THREAD SERIESUNEF
BEARING SURFACE TYPECHAMFERED
THREAD QUANTITY PER INCH32
NOMINAL THREAD SIZE0.375 INCHES IN
NUT STYLEHEXAGON
WIDTH ACROSS FLATS0.500 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
THREAD CLASS2B
MATERIALCOPPER ALLOY OVERALL
NUT HEIGHT0.094 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 20
219189Interchangeable
interchangeable cross-reference
interchangeable
WWP471Interchangeable
interchangeable cross-reference
interchangeable
MI25178Interchangeable
interchangeable cross-reference
interchangeable
4077Interchangeable
interchangeable cross-reference
interchangeable
M125178Interchangeable
interchangeable cross-reference
interchangeable
678606Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 20X520?
20X520 is a NUT,PLAIN,HEXAGON.
What parts can replace 20X520?
There are 20 known substitutes for 20X520: 219189, WWP471, MI25178 and 17 more. Substitute compatibility should be verified for your specific system.
Is 20X520 still available?
20X520 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