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ST3M524-5ME — NUT,PLAIN,CASTELLATED,DOUBLE HEX

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

ST3M524-5ME: NUT,PLAIN,CASTELLATED,DOUBLE HEX.

NUT,PLAIN,CASTELLATED,DOUBLE HEX. Key specifications include material: STEEL OVERALL, nut_style: CASTELLATED, DOUBLE HEXAGONCASTELLATED, DOUBLE HEXAGON, nut_height: 0.303 INCHES MAXIMUM0.303 INCHES MAXIMUM IN, lubrication: DRY FILM LUBRICANTDRY FILM LUBRICANT, thread_class: 3B3B, thread_series: UNIFIED NATIONAL JOINT FINE (UNJF)UNIFIED NATIONAL JOINT FINE (UNJF). This part is cataloged in the U.S.

Government catalog under NSN 5310-01-044-1603, 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
ST3M524-5ME
NSN: 5310-01-044-1603
FSC: 5310 — Nuts and Washers
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleCASTELLATED, DOUBLE HEXAGONCASTELLATED, DOUBLE HEXAGON
nut_height0.303 INCHES MAXIMUM0.303 INCHES MAXIMUM IN
lubricationDRY FILM LUBRICANTDRY FILM LUBRICANT
thread_class3B3B
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF)UNIFIED NATIONAL JOINT FINE (UNJF)
thread_directionRIGHT-HANDRIGHT-HAND
surface_treatmentPASSIVATE OVERALL
width_across_flats0.482 INCHES MINIMUM AND 0.482 INCHES MINIMUM AND 0.502 INCHES MAXIMUM0.502 INCHES MAXIMUM IN
nominal_thread_size0.312 INCHES0.312 INCHES IN
bearing_surface_typeCHAMFEREDCHAMFERED
thread_quantity_per_inch2424
NSN5310-01-044-1603
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: ST3M524-5ME · 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
•
LUBRICATION: DRY FILM LUBRICANTDRY FILM LUBRICANT
•
WIDTH ACROSS FLATS: 0.482 INCHES MINIMUM AND 0.482 INCHES MINIMUM AND 0.502 INCHES MAXIMUM0.502 INCHES MAXIMUM IN
•
THREAD SERIES: UNIFIED NATIONAL JOINT FINE (UNJF)UNIFIED NATIONAL JOINT FINE (UNJF)
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
THREAD DIRECTION: RIGHT-HANDRIGHT-HAND
•
NOMINAL THREAD SIZE: 0.312 INCHES0.312 INCHES IN
•
NUT HEIGHT: 0.303 INCHES MAXIMUM0.303 INCHES MAXIMUM IN
•
SURFACE TREATMENT: PASSIVATE OVERALL
TECHNICAL CHARACTERISTICS
LUBRICATIONDRY FILM LUBRICANTDRY FILM LUBRICANT
WIDTH ACROSS FLATS0.482 INCHES MINIMUM AND 0.482 INCHES MINIMUM AND 0.502 INCHES MAXIMUM0.502 INCHES MAXIMUM IN
THREAD SERIESUNIFIED NATIONAL JOINT FINE (UNJF)UNIFIED NATIONAL JOINT FINE (UNJF)
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
THREAD DIRECTIONRIGHT-HANDRIGHT-HAND
NOMINAL THREAD SIZE0.312 INCHES0.312 INCHES IN
NUT HEIGHT0.303 INCHES MAXIMUM0.303 INCHES MAXIMUM IN
SURFACE TREATMENTPASSIVATE OVERALL
NUT STYLECASTELLATED, DOUBLE HEXAGONCASTELLATED, DOUBLE HEXAGON
THREAD CLASS3B3B
OTHER ITEMS IN FSC 5310 — Nuts and Washers
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5310-00-000-0040 5310-00-000-0077 5310-00-000-0079 5310-00-000-1146 5310-00-000-3815 5310-00-000-4532 5310-00-000-4540
SUBSTITUTES & CROSS-REFERENCES 1
13134-5Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is ST3M524-5ME?
ST3M524-5ME is a NUT,PLAIN,CASTELLATED,DOUBLE HEX.
What parts can replace ST3M524-5ME?
There is 1 known substitute for ST3M524-5ME: 13134-5. Substitute compatibility should be verified for your specific system.
What is the NSN for ST3M524-5ME?
ST3M524-5ME is cataloged in the U.S. Government catalog under NSN 5310-01-044-1603. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.