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4M120C8 — WASHER,CONVEX

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

4M120C8: WASHER,CONVEX.

The WASHER,CONVEX is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, hole_diameter: 0.251 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN, outside_diameter: 0.394 INCHES MINIMUM AND 0.402 INCHES MAXIMUM IN, style_designator: CONVEX, surface_treatment: PASSIVATE OVERALL, material_thickness: 0.063 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-012-7215, 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
4M120C8
NSN: 5310-01-012-7215
FSC: 5310 — Nuts and Washers
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialSTEEL OVERALL
hole_diameter0.251 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN
outside_diameter0.394 INCHES MINIMUM AND 0.402 INCHES MAXIMUM IN
style_designatorCONVEX
surface_treatmentPASSIVATE OVERALL
material_thickness0.063 INCHES NOMINAL IN
material_document_and_classificationMIL-S-7720 MIL SPEC 1ST MATERIAL RESPONSE OR ASTM A484 ASSN STD 2ND MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5310-01-012-7215
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 4M120C8 · 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: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
STYLE DESIGNATOR: CONVEX
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-7720 MIL SPEC 1ST MATERIAL RESPONSE OR ASTM A484 ASSN STD 2ND MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 0.394 INCHES MINIMUM AND 0.402 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.063 INCHES NOMINAL IN
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
MATERIAL: STEEL OVERALL
•
HOLE DIAMETER: 0.251 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
STYLE DESIGNATORCONVEX
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-7720 MIL SPEC 1ST MATERIAL RESPONSE OR ASTM A484 ASSN STD 2ND MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER0.394 INCHES MINIMUM AND 0.402 INCHES MAXIMUM IN
MATERIAL THICKNESS0.063 INCHES NOMINAL IN
SURFACE TREATMENTPASSIVATE OVERALL
MATERIALSTEEL OVERALL
HOLE DIAMETER0.251 INCHES MINIMUM AND 0.255 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: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 4M120C8?
4M120C8 is a WASHER,CONVEX.
What is the NSN for 4M120C8?
4M120C8 is cataloged in the U.S. Government catalog under NSN 5310-01-012-7215. 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.