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B0-523 — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

B0-523: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include material: CELLULOSE OVERALL, thickness: 0.031 INCHES NOMINAL IN, hole_diameter: 0.222 INCHES MINIMUM AND 0.228 INCHES MAXIMUM IN, overall_diameter: 0.375 INCHES NOMINAL IN, peripheral_shape_style: ROUND, center_hole_shape_style: ROUND. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-231-0311, 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
B0-523
NSN: 5310-00-231-0311
FSC: 5310 — Nuts and Washers
CAGE: 85475 — BRACKE R F AND CO (USA)
SPECIFICATIONS
materialCELLULOSE OVERALL
thickness0.031 INCHES NOMINAL IN
hole_diameter0.222 INCHES MINIMUM AND 0.228 INCHES MAXIMUM IN
overall_diameter0.375 INCHES NOMINAL IN
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
material_document_and_classificationMIL-F-10336 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-231-0311
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: B0-523 · 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
•
OVERALL DIAMETER: 0.375 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-F-10336 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
PERIPHERAL SHAPE STYLE: ROUND
•
MATERIAL: CELLULOSE OVERALL
•
CENTER HOLE SHAPE STYLE: ROUND
•
HOLE DIAMETER: 0.222 INCHES MINIMUM AND 0.228 INCHES MAXIMUM IN
•
THICKNESS: 0.031 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
OVERALL DIAMETER0.375 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-F-10336 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
PERIPHERAL SHAPE STYLEROUND
MATERIALCELLULOSE OVERALL
CENTER HOLE SHAPE STYLEROUND
HOLE DIAMETER0.222 INCHES MINIMUM AND 0.228 INCHES MAXIMUM IN
THICKNESS0.031 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 2
171108Reference document
Same NSN cross-reference
Reference document — Secondary reference
23-194Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is B0-523?
B0-523 is a WASHER,FLAT.
What parts can replace B0-523?
There are 2 known substitutes for B0-523: 171108, 23-194. Substitute compatibility should be verified for your specific system.
What is the NSN for B0-523?
B0-523 is cataloged in the U.S. Government catalog under NSN 5310-00-231-0311. 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.