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240840 — WASHER,RECESSED

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

240840: WASHER,RECESSED.

The WASHER,RECESSED is a the manufacturer industrial component. Key specifications include material: STEEL COMP 321 OR STEEL COMP 347 OVERALL, recess_angle: 90.0 DEGREES NOMINAL, recess_depth: 0.076 INCHES NOMINAL IN, hole_diameter: 0.252 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN, recess_diameter: 0.404 INCHES MINIMUM AND 0.412 INCHES MAXIMUM IN, outside_diameter: 0.531 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-254-5420, 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
240840
NSN: 5310-01-254-5420
FSC: 5310 — Nuts and Washers
CAGE: 09205 — LOCKHEED MARTIN CORP ELECTRONICS AND MISSILES DIV (USA)
SPECIFICATIONS
materialSTEEL COMP 321 OR STEEL COMP 347 OVERALL
recess_angle90.0 DEGREES NOMINAL
recess_depth0.076 INCHES NOMINAL IN
hole_diameter0.252 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
recess_diameter0.404 INCHES MINIMUM AND 0.412 INCHES MAXIMUM IN
outside_diameter0.531 INCHES NOMINAL IN
style_designatorRECESSED
surface_treatmentPASSIVATE OVERALL
material_thickness0.100 INCHES NOMINAL IN
material_document_and_classificationQQ-S-763,COND A FED SPEC ALL MATERIAL RESPONSES OVERALL
surface_treatment_document_and_classificationQQ-P-35,TYPE 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5310-01-254-5420
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 240840 · 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,TYPE 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
STYLE DESIGNATOR: RECESSED
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-763,COND A FED SPEC ALL MATERIAL RESPONSES OVERALL
•
OUTSIDE DIAMETER: 0.531 INCHES NOMINAL IN
•
RECESS DEPTH: 0.076 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.100 INCHES NOMINAL IN
•
RECESS DIAMETER: 0.404 INCHES MINIMUM AND 0.412 INCHES MAXIMUM IN
•
SURFACE TREATMENT: PASSIVATE OVERALL
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35,TYPE 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
STYLE DESIGNATORRECESSED
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-763,COND A FED SPEC ALL MATERIAL RESPONSES OVERALL
OUTSIDE DIAMETER0.531 INCHES NOMINAL IN
RECESS DEPTH0.076 INCHES NOMINAL IN
MATERIAL THICKNESS0.100 INCHES NOMINAL IN
RECESS DIAMETER0.404 INCHES MINIMUM AND 0.412 INCHES MAXIMUM IN
SURFACE TREATMENTPASSIVATE OVERALL
MATERIALSTEEL COMP 321 OR STEEL COMP 347 OVERALL
HOLE DIAMETER0.252 INCHES MINIMUM AND 0.260 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: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 240840?
240840 is a WASHER,RECESSED.
What is the NSN for 240840?
240840 is cataloged in the U.S. Government catalog under NSN 5310-01-254-5420. 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.