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6511-30-710-3104 — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

6511-30-710-3104: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include width: 0.420 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN, material: STEEL OVERALL, thickness: 0.053 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN, hole_diameter: 0.255 INCHES MINIMUM AND 0.275 INCHES MAXIMUM IN, surface_finish: 90.0 MICROINCHES ALL SURFACES, overall_diameter: 0.495 INCHES MINIMUM AND 0.520 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-956-4098, 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
6511-30-710-3104
NSN: 5310-00-956-4098
FSC: 5310 — Nuts and Washers
CAGE: 78286 — SIKORSKY AIRCRAFT CORPORATION DBA SIKORSKY AIRCRAFT CORP (USA)
SPECIFICATIONS
width0.420 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN
materialSTEEL OVERALL
thickness0.053 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
hole_diameter0.255 INCHES MINIMUM AND 0.275 INCHES MAXIMUM IN
surface_finish90.0 MICROINCHES ALL SURFACES
overall_diameter0.495 INCHES MINIMUM AND 0.520 INCHES MAXIMUM IN
surface_treatmentCADMIUM OVERALL
peripheral_shape_styleDEE
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
material_document_and_classification66 MIL STD SINGLE MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationQQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5310-00-956-4098
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 6511-30-710-3104 · 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 FINISH: 90.0 MICROINCHES ALL SURFACES
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
OVERALL DIAMETER: 0.495 INCHES MINIMUM AND 0.520 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: 66 MIL STD SINGLE MATERIAL RESPONSE OVERALL
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
SURFACE TREATMENT: CADMIUM OVERALL
•
PERIPHERAL SHAPE STYLE: DEE
•
WIDTH: 0.420 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
SURFACE FINISH90.0 MICROINCHES ALL SURFACES
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
OVERALL DIAMETER0.495 INCHES MINIMUM AND 0.520 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATION66 MIL STD SINGLE MATERIAL RESPONSE OVERALL
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
SURFACE TREATMENTCADMIUM OVERALL
PERIPHERAL SHAPE STYLEDEE
WIDTH0.420 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN
MATERIALSTEEL OVERALL
CENTER HOLE SHAPE STYLEROUND
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 6511-30-710-3104?
6511-30-710-3104 is a WASHER,FLAT.
What is the NSN for 6511-30-710-3104?
6511-30-710-3104 is cataloged in the U.S. Government catalog under NSN 5310-00-956-4098. 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.