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12282040 — WASHER,CONVEX

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

12282040: WASHER,CONVEX.

The WASHER,CONVEX is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4140 OVERALL, hole_diameter: 0.620 INCHES NOMINAL IN, outside_diameter: 2.250 INCHES NOMINAL IN, style_designator: CONVEX, surface_treatment: CADMIUM OVERALL, material_thickness: 0.625 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-078-1200, 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
12282040
NSN: 5310-01-078-1200
FSC: 5310 — Nuts and Washers
CAGE: 19200 — COMBAT CAPABILITIES DEVELOPMENT COMMAND (CCDC) ARMAMENTS CENTER DBA CCDC DIV LOGISTICS RESEARCH AND ENGINEERING DIRECTORATE (USA)
SPECIFICATIONS
materialSTEEL COMP 4140 OVERALL
hole_diameter0.620 INCHES NOMINAL IN
outside_diameter2.250 INCHES NOMINAL IN
style_designatorCONVEX
surface_treatmentCADMIUM OVERALL
material_thickness0.625 INCHES NOMINAL IN
end_item_identificationM1,XM1 TANK
surface_treatment_document_and_classificationMIL-C-81562A,TYPE 2,CLASS 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL A
NSN5310-01-078-1200
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 12282040 · 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 TREATMENT DOCUMENT AND CLASSIFICATION: MIL-C-81562A,TYPE 2,CLASS 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL A
•
STYLE DESIGNATOR: CONVEX
•
OUTSIDE DIAMETER: 2.250 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.625 INCHES NOMINAL IN
•
SURFACE TREATMENT: CADMIUM OVERALL
•
MATERIAL: STEEL COMP 4140 OVERALL
•
HOLE DIAMETER: 0.620 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-C-81562A,TYPE 2,CLASS 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL A
STYLE DESIGNATORCONVEX
OUTSIDE DIAMETER2.250 INCHES NOMINAL IN
MATERIAL THICKNESS0.625 INCHES NOMINAL IN
SURFACE TREATMENTCADMIUM OVERALL
END ITEM IDENTIFICATIONM1,XM1 TANK
MATERIALSTEEL COMP 4140 OVERALL
HOLE DIAMETER0.620 INCHES NOMINAL 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: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 12282040?
12282040 is a WASHER,CONVEX.
What is the NSN for 12282040?
12282040 is cataloged in the U.S. Government catalog under NSN 5310-01-078-1200. 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.