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PartsTable / COMPONENT / 418B
418B ✓ 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 WASHER,LOCK is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY OVERALL, hole_diameter: 0.115 INCHES MINIMUM AND 0.123 INCHES MAXIMUM IN, outside_diameter: 0.255 INCHES MINIMUM AND 0.265 INCHES MAXIMUM IN, style_designator: FLAT INTERNAL TEETH, surface_treatment: CADMIUM OVERALL, material_thickness: 0.016 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-187-8609, 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
418B
NSN: 5310-00-187-8609
FSC: 5310
CAGE: 78452 — MICRODOT INC EVERLOCK CHICAGO DIV (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
hole_diameter0.115 INCHES MINIMUM AND 0.123 INCHES MAXIMUM IN
outside_diameter0.255 INCHES MINIMUM AND 0.265 INCHES MAXIMUM IN
style_designatorFLAT INTERNAL TEETH
surface_treatmentCADMIUM OVERALL
material_thickness0.016 INCHES NOMINAL IN
NSN5310-00-187-8609
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 418B · 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
•
OUTSIDE DIAMETER: 0.255 INCHES MINIMUM AND 0.265 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: FLAT INTERNAL TEETH
•
MATERIAL: COPPER ALLOY OVERALL
•
HOLE DIAMETER: 0.115 INCHES MINIMUM AND 0.123 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.016 INCHES NOMINAL IN
•
SURFACE TREATMENT: CADMIUM OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
OUTSIDE DIAMETER0.255 INCHES MINIMUM AND 0.265 INCHES MAXIMUM IN
STYLE DESIGNATORFLAT INTERNAL TEETH
MATERIALCOPPER ALLOY OVERALL
HOLE DIAMETER0.115 INCHES MINIMUM AND 0.123 INCHES MAXIMUM IN
MATERIAL THICKNESS0.016 INCHES NOMINAL IN
SURFACE TREATMENTCADMIUM OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
T-244-MInterchangeable
interchangeable cross-reference
interchangeable
72-700476-1Interchangeable
interchangeable cross-reference
interchangeable
MS35431-3Interchangeable
interchangeable cross-reference
interchangeable
CF125Interchangeable
interchangeable cross-reference
interchangeable
1904Interchangeable
interchangeable cross-reference
interchangeable
73A4Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 418B?
418B is a WASHER,LOCK.
What parts can replace 418B?
There are 15 known substitutes for 418B: T-244-M, 72-700476-1, MS35431-3 and 12 more. Substitute compatibility should be verified for your specific system.
Is 418B still available?
418B 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