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PartsTable / COMPONENT / F49251-4-6
F49251-4-6 ✓ 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,SELF-LOCKING,PLATE is a the manufacturer industrial component. Key specifications include material: IRON ALLOY 660 SHELL, nut_style: PLATE, nut_height: 0.600 INCHES MAXIMUM IN, nut_length: 1.306 INCHES MAXIMUM IN, lubrication: DRY FILM LUBRICANT, plate_width: 0.574 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-279-4284, 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
F49251-4-6
NSN: 5310-00-279-4284
FSC: 5310
CAGE: 15653 — HOWMET GLOBAL FASTENING SYSTEMS INC (USA)
SPECIFICATIONS
materialIRON ALLOY 660 SHELL
nut_stylePLATE
nut_height0.600 INCHES MAXIMUM IN
nut_length1.306 INCHES MAXIMUM IN
lubricationDRY FILM LUBRICANT
plate_width0.574 INCHES NOMINAL IN
thread_class3B
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF)
locking_featurePREVAILING TORQUE ALL METAL DESIGN
plate_thickness0.028 INCHES MINIMUM AND 0.036 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
features_providedFLOATING NUT
NSN5310-00-279-4284
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: F49251-4-6 · 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
•
PLATE WIDTH: 0.574 INCHES NOMINAL IN
•
LOCKING FEATURE: PREVAILING TORQUE ALL METAL DESIGN
•
MATERIAL: STEEL CORROSION RESISTING CLIP
•
PLATE THICKNESS: 0.028 INCHES MINIMUM AND 0.036 INCHES MAXIMUM IN
•
THREAD QUANTITY PER INCH: 28
•
THREAD SERIES: UNIFIED NATIONAL JOINT FINE (UNJF)
•
SPECIFICATION/STANDARD DATA: 76301-ST3-442 MANUFACTURERS STANDARD
•
MOUNTING HOLE ARRANGEMENT STYLE: 2 HOLES
TECHNICAL CHARACTERISTICS (FLIS)
PLATE WIDTH0.574 INCHES NOMINAL IN
LOCKING FEATUREPREVAILING TORQUE ALL METAL DESIGN
MATERIALSTEEL CORROSION RESISTING CLIP
PLATE THICKNESS0.028 INCHES MINIMUM AND 0.036 INCHES MAXIMUM IN
THREAD QUANTITY PER INCH28
THREAD SERIESUNIFIED NATIONAL JOINT FINE (UNJF)
SPECIFICATION/STANDARD DATA76301-ST3-442 MANUFACTURERS STANDARD
MOUNTING HOLE ARRANGEMENT STYLE2 HOLES
THREAD CLASS3B
FEATURES PROVIDEDFLOATING NUT
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
L-6AInterchangeable
interchangeable cross-reference
interchangeable
1404437-1Interchangeable
interchangeable cross-reference
interchangeable
A964A3B015HInterchangeable
interchangeable cross-reference
interchangeable
L64Interchangeable
interchangeable cross-reference
interchangeable
55-22053-67Interchangeable
interchangeable cross-reference
interchangeable
10967Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is F49251-4-6?
F49251-4-6 is a NUT,SELF-LOCKING,PLATE.
What parts can replace F49251-4-6?
There are 15 known substitutes for F49251-4-6: L-6A, 1404437-1, A964A3B015H and 12 more. Substitute compatibility should be verified for your specific system.
Is F49251-4-6 still available?
F49251-4-6 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