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6531-21-219-2101 — WASHER,CONCAVE

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

6531-21-219-2101: WASHER,CONCAVE.

The WASHER,CONCAVE is a the manufacturer industrial component. Key specifications include radius: 0.615 INCHES NOMINAL IN, material: STEEL COMP 321 OVERALL, hole_diameter: 0.270 INCHES NOMINAL IN, outside_diameter: 0.650 INCHES NOMINAL IN, style_designator: CONCAVE, surface_treatment: PASSIVATE OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-169-2095, 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
6531-21-219-2101
NSN: 5310-01-169-2095
FSC: 5310 — Nuts and Washers
CAGE: 78286 — SIKORSKY AIRCRAFT CORPORATION DBA SIKORSKY AIRCRAFT CORP (USA)
SPECIFICATIONS
radius0.615 INCHES NOMINAL IN
materialSTEEL COMP 321 OVERALL
hole_diameter0.270 INCHES NOMINAL IN
outside_diameter0.650 INCHES NOMINAL IN
style_designatorCONCAVE
surface_treatmentPASSIVATE OVERALL
material_thickness0.145 INCHES NOMINAL IN
material_document_and_classificationQQ-S-763,COND A FED SPEC SINGLE MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationSS8435,FSCM 78286 MFR REF SINGLE TREATMENT RESPONSE OVERALL
NSN5310-01-169-2095
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 6531-21-219-2101 · 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: SS8435,FSCM 78286 MFR REF SINGLE TREATMENT RESPONSE OVERALL
•
RADIUS: 0.615 INCHES NOMINAL IN
•
STYLE DESIGNATOR: CONCAVE
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-763,COND A FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 0.650 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.145 INCHES NOMINAL IN
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
MATERIAL: STEEL COMP 321 OVERALL
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONSS8435,FSCM 78286 MFR REF SINGLE TREATMENT RESPONSE OVERALL
RADIUS0.615 INCHES NOMINAL IN
STYLE DESIGNATORCONCAVE
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-763,COND A FED SPEC SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER0.650 INCHES NOMINAL IN
MATERIAL THICKNESS0.145 INCHES NOMINAL IN
SURFACE TREATMENTPASSIVATE OVERALL
MATERIALSTEEL COMP 321 OVERALL
HOLE DIAMETER0.270 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
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 6531-21-219-2101?
6531-21-219-2101 is a WASHER,CONCAVE.
What is the NSN for 6531-21-219-2101?
6531-21-219-2101 is cataloged in the U.S. Government catalog under NSN 5310-01-169-2095. 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.