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218T1800 — WASHER,CONVEX

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

218T1800: WASHER,CONVEX.

The WASHER,CONVEX is a the manufacturer industrial component. Key specifications include hole_diameter: 3.755 INCHES MINIMUM AND 3.765 INCHES MAXIMUM IN, surface_finish: 63.0 MICROINCHES TOP, outside_diameter: 4.060 INCHES NOMINAL IN, special_features: RADIUS 0.110 IN. MIN 0.110 IN.

MAX IN, style_designator: CONVEX, material_thickness: 0.225 INCHES MINIMUM AND 0.230 INCHES MAXIMUM IN. This part is cataloged in the U.S. Government catalog under NSN 5310-01-170-3190, 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
218T1800
NSN: 5310-01-170-3190
FSC: 5310 — Nuts and Washers
CAGE: 27315 — MORRIS MATERIAL HANDLING, INC. (USA)
SPECIFICATIONS
hole_diameter3.755 INCHES MINIMUM AND 3.765 INCHES MAXIMUM IN
surface_finish63.0 MICROINCHES TOP
outside_diameter4.060 INCHES NOMINAL IN
special_featuresRADIUS 0.110 IN. MIN 0.110 IN. MAX IN
style_designatorCONVEX
material_thickness0.225 INCHES MINIMUM AND 0.230 INCHES MAXIMUM IN
NSN5310-01-170-3190
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 218T1800 · 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
•
SURFACE FINISH: 63.0 MICROINCHES TOP
•
STYLE DESIGNATOR: CONVEX
•
OUTSIDE DIAMETER: 4.060 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.225 INCHES MINIMUM AND 0.230 INCHES MAXIMUM IN
•
HOLE DIAMETER: 3.755 INCHES MINIMUM AND 3.765 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
SURFACE FINISH63.0 MICROINCHES TOP
STYLE DESIGNATORCONVEX
OUTSIDE DIAMETER4.060 INCHES NOMINAL IN
MATERIAL THICKNESS0.225 INCHES MINIMUM AND 0.230 INCHES MAXIMUM IN
SPECIAL FEATURESRADIUS 0.110 IN. MIN 0.110 IN. MAX IN
HOLE DIAMETER3.755 INCHES MINIMUM AND 3.765 INCHES MAXIMUM IN
OTHER ITEMS IN FSC 5310 — Nuts and Washers
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5310-00-000-0040 5310-00-000-0077 5310-00-000-0079 5310-00-000-1146 5310-00-000-3815 5310-00-000-4532 5310-00-000-4540
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Semi-active item — no replacement plannedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 218T1800?
218T1800 is a WASHER,CONVEX.
What is the NSN for 218T1800?
218T1800 is cataloged in the U.S. Government catalog under NSN 5310-01-170-3190. 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.