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Technical Data Sheet
PartsTable / COMPONENT / ST3M404-8
ST3M404-8 ✓ 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,SLOTTED,HEXAGON is a the manufacturer industrial component. Key specifications include material: IRON ALLOY 660 OVERALL, nut_style: SLOTTED, HEXAGON, nut_height: 0.250 INCHES NOMINAL IN, thread_class: 3B, thread_series: UNIFIED NATIONAL JOINT FINE (UNJF), hardness_rating: 27.0 ROCKWELL C MINIMUM AND 33.0 ROCKWELL C MAXIMUM. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-038-4699, 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
ST3M404-8
NSN: 5310-01-038-4699
FSC: 5310
CAGE: 92595 — NELSON STUD WELDING, INC (USA)
SPECIFICATIONS
materialIRON ALLOY 660 OVERALL
nut_styleSLOTTED, HEXAGON
nut_height0.250 INCHES NOMINAL IN
thread_class3B
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF)
hardness_rating27.0 ROCKWELL C MINIMUM AND 33.0 ROCKWELL C MAXIMUM
thread_directionRIGHT-HAND
surface_treatmentCADMIUM AND CHROMATE OVERALL
width_across_flats0.730 INCHES MINIMUM AND 0.752 INCHES MAXIMUM IN
nominal_thread_size0.500 INCHES IN
bearing_surface_typeWASHER FACED
thread_quantity_per_inch20
NSN5310-01-038-4699
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: ST3M404-8 · 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
•
WIDTH ACROSS FLATS: 0.730 INCHES MINIMUM AND 0.752 INCHES MAXIMUM IN
•
MATERIAL: IRON ALLOY 660 OVERALL
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
THREAD DIRECTION: RIGHT-HAND
•
THREAD QUANTITY PER INCH: 20
•
THREAD SERIES: UNIFIED NATIONAL JOINT FINE (UNJF)
•
NOMINAL THREAD SIZE: 0.500 INCHES IN
TECHNICAL CHARACTERISTICS (FLIS)
WIDTH ACROSS FLATS0.730 INCHES MINIMUM AND 0.752 INCHES MAXIMUM IN
MATERIALIRON ALLOY 660 OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
THREAD DIRECTIONRIGHT-HAND
THREAD QUANTITY PER INCH20
THREAD SERIESUNIFIED NATIONAL JOINT FINE (UNJF)
NOMINAL THREAD SIZE0.500 INCHES IN
HARDNESS RATING27.0 ROCKWELL C MINIMUM AND 33.0 ROCKWELL C MAXIMUM
BEARING SURFACE TYPEWASHER FACED
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
10-1220-18Interchangeable
interchangeable cross-reference
interchangeable
10-1220-00Interchangeable
interchangeable cross-reference
interchangeable
7464-08Interchangeable
interchangeable cross-reference
interchangeable
7464 REV C ITEM NO. 8Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is ST3M404-8?
ST3M404-8 is a NUT,PLAIN,SLOTTED,HEXAGON.
What parts can replace ST3M404-8?
There are 4 known substitutes for ST3M404-8: 10-1220-18, 10-1220-00, 7464-08 and 1 more. Substitute compatibility should be verified for your specific system.
Is ST3M404-8 still available?
ST3M404-8 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