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4BA — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

4BA: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, surface_treatment: CADMIUM AND PASSIVATE OVERALL, surface_treatment_document_and_classification: DTD TO 904/C,FSCM K0195 MFR REF 1ST TREATMENT RESPONSE AND DEF130,FSCM K0195 MFR REF 2ND TREATMENT RESPONSE OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-040-4739, 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
4BA
NSN: 5310-01-040-4739
FSC: 5310 — Nuts and Washers
CAGE: K7766 — BSI STANDARDS LIMITED (GBR)
SPECIFICATIONS
materialSTEEL OVERALL
surface_treatmentCADMIUM AND PASSIVATE OVERALL
surface_treatment_document_and_classificationDTD TO 904/C,FSCM K0195 MFR REF 1ST TREATMENT RESPONSE AND DEF130,FSCM K0195 MFR REF 2ND TREATMENT RESPONSE OVERALL
NSN5310-01-040-4739
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 4BA · 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: DTD TO 904/C,FSCM K0195 MFR REF 1ST TREATMENT RESPONSE AND DEF130,FSCM K0195 MFR REF 2ND TREATMENT RESPONSE OVERALL
•
SURFACE TREATMENT: CADMIUM AND PASSIVATE OVERALL
•
MATERIAL: STEEL OVERALL
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONDTD TO 904/C,FSCM K0195 MFR REF 1ST TREATMENT RESPONSE AND DEF130,FSCM K0195 MFR REF 2ND TREATMENT RESPONSE OVERALL
SURFACE TREATMENTCADMIUM AND PASSIVATE OVERALL
MATERIALSTEEL OVERALL
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 4BA?
4BA is a WASHER,FLAT.
What is the NSN for 4BA?
4BA is cataloged in the U.S. Government catalog under NSN 5310-01-040-4739. 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.