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32-21181-3 — WASHER,RECESSED

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

32-21181-3: WASHER,RECESSED.

The WASHER,RECESSED is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY 2024 OVERALL, recess_angle: 90.0 DEGREES NOMINAL, hole_diameter: 0.203 INCHES NOMINAL IN, heat_treatment: T-4 SOLUTION HEAT TREATED, NATURAL AGED, recess_diameter: 0.313 INCHES MINIMUM AND 0.353 INCHES MAXIMUM IN, outside_diameter: 0.436 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-421-3468, 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
32-21181-3
NSN: 5310-00-421-3468
FSC: 5310 — Nuts and Washers
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 2024 OVERALL
recess_angle90.0 DEGREES NOMINAL
hole_diameter0.203 INCHES NOMINAL IN
heat_treatmentT-4 SOLUTION HEAT TREATED, NATURAL AGED
recess_diameter0.313 INCHES MINIMUM AND 0.353 INCHES MAXIMUM IN
outside_diameter0.436 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN
style_designatorRECESSED
material_thickness0.090 INCHES NOMINAL IN
material_document_and_classificationQQ-A-225/6 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-421-3468
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 32-21181-3 · 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
•
HEAT TREATMENT: T-4 SOLUTION HEAT TREATED, NATURAL AGED
•
STYLE DESIGNATOR: RECESSED
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-A-225/6 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 0.436 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.090 INCHES NOMINAL IN
•
RECESS DIAMETER: 0.313 INCHES MINIMUM AND 0.353 INCHES MAXIMUM IN
•
MATERIAL: ALUMINUM ALLOY 2024 OVERALL
•
HOLE DIAMETER: 0.203 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
HEAT TREATMENTT-4 SOLUTION HEAT TREATED, NATURAL AGED
STYLE DESIGNATORRECESSED
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-225/6 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER0.436 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN
MATERIAL THICKNESS0.090 INCHES NOMINAL IN
RECESS DIAMETER0.313 INCHES MINIMUM AND 0.353 INCHES MAXIMUM IN
MATERIALALUMINUM ALLOY 2024 OVERALL
HOLE DIAMETER0.203 INCHES NOMINAL IN
RECESS ANGLE90.0 DEGREES NOMINAL
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
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 32-21181-3?
32-21181-3 is a WASHER,RECESSED.
What is the NSN for 32-21181-3?
32-21181-3 is cataloged in the U.S. Government catalog under NSN 5310-00-421-3468. 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.