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ST4M213C03001 — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

ST4M213C03001: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include width: 0.384 INCHES NOMINAL IN, thickness: 0.063 INCHES NOMINAL IN, hole_diameter: 0.203 INCHES NOMINAL IN, overall_diameter: 0.438 INCHES NOMINAL IN, surface_treatment: PASSIVATE OVERALL, peripheral_shape_style: DEE. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-054-5978, 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
ST4M213C03001
NSN: 5310-01-054-5978
FSC: 5310 — Nuts and Washers
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
width0.384 INCHES NOMINAL IN
materialSTEEL COMP 301 OR STEEL COMP 302 OR STEEL COMP 304 OR STEEL COMP 316 OR STEEL COMP 321 OR STEEL COMP 347 OR STEEL COMP 348 OVERALL
thickness0.063 INCHES NOMINAL IN
hole_diameter0.203 INCHES NOMINAL IN
overall_diameter0.438 INCHES NOMINAL IN
surface_treatmentPASSIVATE OVERALL
peripheral_shape_styleDEE
center_hole_shape_styleROUND
cross-sectional_shape_styleBLANK RECTANGULAR
outside_left_corner_chamfer_angle45.0 DEGREES NOMINAL
surface_treatment_document_and_classificationQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5310-01-054-5978
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: ST4M213C03001 · 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
•
OUTSIDE LEFT CORNER CHAMFER ANGLE: 45.0 DEGREES NOMINAL
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
OVERALL DIAMETER: 0.438 INCHES NOMINAL IN
•
CROSS-SECTIONAL SHAPE STYLE: BLANK RECTANGULAR
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
PERIPHERAL SHAPE STYLE: DEE
•
WIDTH: 0.384 INCHES NOMINAL IN
•
MATERIAL: STEEL COMP 301 OR STEEL COMP 302 OR STEEL COMP 304 OR STEEL COMP 316 OR STEEL COMP 321 OR STEEL COMP 347 OR STEEL COMP 348 OVERALL
TECHNICAL CHARACTERISTICS
OUTSIDE LEFT CORNER CHAMFER ANGLE45.0 DEGREES NOMINAL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
OVERALL DIAMETER0.438 INCHES NOMINAL IN
CROSS-SECTIONAL SHAPE STYLEBLANK RECTANGULAR
SURFACE TREATMENTPASSIVATE OVERALL
PERIPHERAL SHAPE STYLEDEE
WIDTH0.384 INCHES NOMINAL IN
MATERIALSTEEL COMP 301 OR STEEL COMP 302 OR STEEL COMP 304 OR STEEL COMP 316 OR STEEL COMP 321 OR STEEL COMP 347 OR STEEL COMP 348 OVERALL
CENTER HOLE SHAPE STYLEROUND
HOLE DIAMETER0.203 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: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is ST4M213C03001?
ST4M213C03001 is a WASHER,FLAT.
What is the NSN for ST4M213C03001?
ST4M213C03001 is cataloged in the U.S. Government catalog under NSN 5310-01-054-5978. 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.