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2-18678 — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

2-18678: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: ROUND, head_height: 0.059 INCHES MINIMUM AND 0.069 INCHES MAXIMUM IN, pilot_length: 0.047 INCHES NOMINAL IN, head_diameter: 0.148 INCHES MINIMUM AND 0.182 INCHES MAXIMUM IN, pilot_diameter: 0.080 INCHES MINIMUM AND 0.083 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-905-8390, 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
2-18678
NSN: 5310-00-905-8390
NIINs: 009058390, 011345553, 013341628
FSC: 5310 — Nuts and Washers
CAGE: 62983 — EATON AEROSPACE, LLC DBA JACKSON SOUTH (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleROUND
head_height0.059 INCHES MINIMUM AND 0.069 INCHES MAXIMUM IN
pilot_length0.047 INCHES NOMINAL IN
head_diameter0.148 INCHES MINIMUM AND 0.182 INCHES MAXIMUM IN
pilot_diameter0.080 INCHES MINIMUM AND 0.083 INCHES MAXIMUM IN
fastener_length0.105 INCHES MINIMUM AND 0.145 INCHES MAXIMUM IN
features_providedCASEHARDENED
surface_treatmentCADMIUM OR ZINC OVERALL
nonmachine_thread_styleDRIVE SCREW (TYPE U)
nonmachine_nominal_thread_diameter0.086 INCHES IN
surface_treatment_document_and_classificationMIL STD 171,TYPE 2,CLASS 3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5310-00-905-8390
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 2-18678 · 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: 0.326 INCHES MAXIMUM IN
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
PERIPHERAL SHAPE STYLE: ROUND
•
MATERIAL: STEEL OVERALL
•
CENTER HOLE SHAPE STYLE: ROUND
•
THICKNESS: 0.032 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
OVERALL DIAMETER0.326 INCHES MAXIMUM IN
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
PERIPHERAL SHAPE STYLEROUND
MATERIALSTEEL OVERALL
CENTER HOLE SHAPE STYLEROUND
THICKNESS0.032 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 2-18678?
2-18678 is a WASHER,FLAT.
What is the NSN for 2-18678?
2-18678 is cataloged in the U.S. Government catalog under NSN 5310-00-905-8390. 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.