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ST3M523C3M2 — NUT,CLIP-ON

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

ST3M523C3M2: NUT,CLIP-ON.

The NUT,CLIP-ON is a the manufacturer industrial component. Key specifications include material: IRON ALLOY 660 CLIP, nut_style: FLOATINGFLOATING, thread_class: 3B3B, overall_width: 0.437 INCHES MAXIMUM0.437 INCHES MAXIMUM IN, thread_series: UNIFIED NATIONAL JOINT FINE (UNJF)UNIFIED NATIONAL JOINT FINE (UNJF), locking_feature: PREVAILING TORQUE ALL METAL DESIGNPREVAILING TORQUE ALL METAL DESIGN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-185-4665, 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
ST3M523C3M2
NSN: 5310-01-185-4665
FSC: 5310 — Nuts and Washers
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialIRON ALLOY 660 CLIP
nut_styleFLOATINGFLOATING
thread_class3B3B
overall_width0.437 INCHES MAXIMUM0.437 INCHES MAXIMUM IN
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF)UNIFIED NATIONAL JOINT FINE (UNJF)
locking_featurePREVAILING TORQUE ALL METAL DESIGNPREVAILING TORQUE ALL METAL DESIGN
panel_thickness0.175 INCHES MINIMUM AND 0.175 INCHES MINIMUM AND 0.205 INCHES MAXIMUM0.205 INCHES MAXIMUM IN
thread_directionRIGHT-HANDRIGHT-HAND
countersink_angle90.0 DEGREES NOMINAL CLIP
surface_treatmentPASSIVATE CLIP
nominal_thread_size0.190 INCHES0.190 INCHES IN
thread_quantity_per_inch3232
NSN5310-01-185-4665
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: ST3M523C3M2 · 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
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE CLIP
•
THREAD SERIES: UNIFIED NATIONAL JOINT FINE (UNJF)UNIFIED NATIONAL JOINT FINE (UNJF)
•
DISTANCE FROM BASE TO CENTER OF APERTURE: 0.520 INCHES NOMINAL0.520 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5525 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5732 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE NUT
•
THREAD DIRECTION: RIGHT-HANDRIGHT-HAND
•
PANEL THICKNESS: 0.175 INCHES MINIMUM AND 0.175 INCHES MINIMUM AND 0.205 INCHES MAXIMUM0.205 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE CLIP
THREAD SERIESUNIFIED NATIONAL JOINT FINE (UNJF)UNIFIED NATIONAL JOINT FINE (UNJF)
DISTANCE FROM BASE TO CENTER OF APERTURE0.520 INCHES NOMINAL0.520 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5525 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5732 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE NUT
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5525 ASSN STD SINGLE MATERIAL RESPONSE CLIP
OVERALL WIDTH0.437 INCHES MAXIMUM0.437 INCHES MAXIMUM IN
THREAD DIRECTIONRIGHT-HANDRIGHT-HAND
PANEL THICKNESS0.175 INCHES MINIMUM AND 0.175 INCHES MINIMUM AND 0.205 INCHES MAXIMUM0.205 INCHES MAXIMUM IN
NOMINAL THREAD SIZE0.190 INCHES0.190 INCHES IN
LOCKING FEATUREPREVAILING TORQUE ALL METAL DESIGNPREVAILING TORQUE ALL METAL DESIGN
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
A11144-8-3Reference 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 ST3M523C3M2?
ST3M523C3M2 is a NUT,CLIP-ON.
What parts can replace ST3M523C3M2?
There is 1 known substitute for ST3M523C3M2: A11144-8-3. Substitute compatibility should be verified for your specific system.
What is the NSN for ST3M523C3M2?
ST3M523C3M2 is cataloged in the U.S. Government catalog under NSN 5310-01-185-4665. 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.