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12518731 — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

12518731: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include shape: ROUND, material: ALUMINUM ALLOY, thickness: 0.500 INCHES NOMINAL IN, end_item_identification: 2320-01-544-9638 TRUCK, UTILITY, part_name_assigned_by_controlling_agency: PLATE, TURRET REINFORCEMENT. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-063-1999, 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
12518731
NSN: 5310-00-063-1999
NIINs: 000631999, 007544507, 015732730
FSC: 5310 — Nuts and Washers
CAGE: 1NZ85 — EMCORE SPACE & NAVIGATION CORPORATION DIV SPACE & NAVIGATION (USA)
SPECIFICATIONS
shapeROUND
materialALUMINUM ALLOY
thickness0.500 INCHES NOMINAL IN
end_item_identification2320-01-544-9638 TRUCK, UTILITY
part_name_assigned_by_controlling_agencyPLATE, TURRET REINFORCEMENT
NSN5310-00-063-1999
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 12518731 · 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: 0.210 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: -MIL-S-5059 COND B MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
PERIPHERAL SHAPE STYLE: ROUND
•
MATERIAL: STEEL COMP 301 OVERALL
•
CENTER HOLE SHAPE STYLE: ROUND
•
HOLE DIAMETER: 0.105 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
OVERALL DIAMETER0.210 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATION-MIL-S-5059 COND B MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
SURFACE TREATMENTPASSIVATE OVERALL
PERIPHERAL SHAPE STYLEROUND
MATERIALSTEEL COMP 301 OVERALL
CENTER HOLE SHAPE STYLEROUND
HOLE DIAMETER0.105 INCHES NOMINAL IN
THICKNESS0.020 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 12518731?
12518731 is a WASHER,FLAT.
What is the NSN for 12518731?
12518731 is cataloged in the U.S. Government catalog under NSN 5310-00-063-1999. 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.