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Technical Data Sheet
PartsTable / COMPONENT / SM-B-426803
SM-B-426803 ✓ 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,FLAT is a the manufacturer industrial component. Key specifications include thickness: 0.031 INCHES NOMINAL IN, overall_diameter: 0.562 INCHES NOMINAL IN, special_features: MATERIAL IS STEEL LOCATION UNKNOWN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-594-4042, 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
SM-B-426803
NSN: 5310-00-594-4042
FSC: 5310
CAGE: 80063 — US ARMY COMMUNICATIONS & ELECTRONICS MATERIEL READINESS COMMAND LOGISTICS ENGINEERING DIR (USA)
SPECIFICATIONS
thickness0.031 INCHES NOMINAL IN
overall_diameter0.562 INCHES NOMINAL IN
special_featuresMATERIAL IS STEEL LOCATION UNKNOWN
NSN5310-00-594-4042
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: SM-B-426803 · 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
•
THICKNESS: 0.031 INCHES NOMINAL IN
•
OVERALL DIAMETER: 0.562 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
THICKNESS0.031 INCHES NOMINAL IN
OVERALL DIAMETER0.562 INCHES NOMINAL IN
SPECIAL FEATURESMATERIAL IS STEEL LOCATION UNKNOWN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
51115Interchangeable
interchangeable cross-reference
interchangeable
C08931Interchangeable
interchangeable cross-reference
interchangeable
27329Interchangeable
interchangeable cross-reference
interchangeable
11579Interchangeable
interchangeable cross-reference
interchangeable
617719Interchangeable
interchangeable cross-reference
interchangeable
666118Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is SM-B-426803?
SM-B-426803 is a WASHER,FLAT.
What parts can replace SM-B-426803?
There are 15 known substitutes for SM-B-426803: 51115, C08931, 27329 and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for SM-B-426803?
SM-B-426803 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-594-4042. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026