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522566 ✓ 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, coil_helix_direction: RIGHT-HAND OR LEFT-HAND. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-274-7758, 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
522566
NSN: 5310-00-274-7758
FSC: 5310
CAGE: K2504 — RS COMPONENTS LIMITED (GBR)
SPECIFICATIONS
materialSTEEL OVERALL
coil_helix_directionRIGHT-HAND OR LEFT-HAND
NSN5310-00-274-7758
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 522566 · 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: UNIFIED NATIONAL COARSE (UNC)
•
NOMINAL THREAD SIZE: 0.164 INCHES IN
•
BEARING SURFACE TYPE: CHAMFERED
•
THREAD QUANTITY PER INCH: 32
•
NUT HEIGHT: 0.125 INCHES NOMINAL IN
•
NUT STYLE: HEXAGON
•
THREAD DIRECTION: RIGHT-HAND
•
WIDTH ACROSS FLATS: 0.343 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
NOMINAL THREAD SIZE0.164 INCHES IN
BEARING SURFACE TYPECHAMFERED
THREAD QUANTITY PER INCH32
NUT HEIGHT0.125 INCHES NOMINAL IN
NUT STYLEHEXAGON
THREAD DIRECTIONRIGHT-HAND
WIDTH ACROSS FLATS0.343 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-B-637 FED SPEC ALL MATERIAL RESPONSES OVERALL
MATERIALCOPPER ALLOY 462 OR COPPER ALLOY 464 OR COPPER ALLOY 482 OR COPPER ALLOY 485 OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 17
265561PC87Interchangeable
interchangeable cross-reference
interchangeable
1581000058Interchangeable
interchangeable cross-reference
interchangeable
FFN836GPCTYPE2STYLE2Interchangeable
interchangeable cross-reference
interchangeable
300477PC6Interchangeable
interchangeable cross-reference
interchangeable
MS35650-45Interchangeable
interchangeable cross-reference
interchangeable
148683PC19Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 522566?
522566 is a NUT,PLAIN,HEXAGON.
What parts can replace 522566?
There are 17 known substitutes for 522566: 265561PC87, 1581000058, FFN836GPCTYPE2STYLE2 and 14 more. Substitute compatibility should be verified for your specific system.
Is 522566 still available?
522566 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