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6661522-58 — WASHER,SLOTTED

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

6661522-58: WASHER,SLOTTED.

The WASHER,SLOTTED is a the manufacturer industrial component. Key specifications include material: STEEL COMP 410 OVERALL, hole_diameter: 0.253 INCHES MINIMUM AND 0.258 INCHES MAXIMUM IN, heat_treatment: ANNEALED, surface_finish: 32.0 MICROINCHES TOP, hardness_rating: 79.4 ROCKWELL SUPERFICIAL 15-N MINIMUM AND 83.5 ROCKWELL SUPERFICIAL 15-N MAXIMUM, outside_diameter: 0.495 INCHES MINIMUM AND 0.498 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-113-6728, 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
6661522-58
NSN: 5310-00-113-6728
FSC: 5310 — Nuts and Washers
CAGE: 09523 — PARKER-HANNIFIN CORPORATION DIV GAS TURBINE FUEL SYSTEMS (USA)
SPECIFICATIONS
materialSTEEL COMP 410 OVERALL
hole_diameter0.253 INCHES MINIMUM AND 0.258 INCHES MAXIMUM IN
heat_treatmentANNEALED
surface_finish32.0 MICROINCHES TOP
hardness_rating79.4 ROCKWELL SUPERFICIAL 15-N MINIMUM AND 83.5 ROCKWELL SUPERFICIAL 15-N MAXIMUM
outside_diameter0.495 INCHES MINIMUM AND 0.498 INCHES MAXIMUM IN
style_designatorSLOTTED
surface_treatmentPASSIVATE OVERALL
material_thickness0.0985 INCHES MINIMUM AND 0.0989 INCHES MAXIMUM IN
material_document_and_classificationQQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-113-6728
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 6661522-58 · 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: 32.0 MICROINCHES BOTTOM
•
HEAT TREATMENT: ANNEALED
•
HARDNESS RATING: 79.4 ROCKWELL SUPERFICIAL 15-N MINIMUM AND 83.5 ROCKWELL SUPERFICIAL 15-N MAXIMUM
•
STYLE DESIGNATOR: SLOTTED
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 0.495 INCHES MINIMUM AND 0.498 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.0985 INCHES MINIMUM AND 0.0989 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
SURFACE FINISH32.0 MICROINCHES BOTTOM
SURFACE FINISH32.0 MICROINCHES TOP
HEAT TREATMENTANNEALED
HARDNESS RATING79.4 ROCKWELL SUPERFICIAL 15-N MINIMUM AND 83.5 ROCKWELL SUPERFICIAL 15-N MAXIMUM
STYLE DESIGNATORSLOTTED
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER0.495 INCHES MINIMUM AND 0.498 INCHES MAXIMUM IN
MATERIAL THICKNESS0.0985 INCHES MINIMUM AND 0.0989 INCHES MAXIMUM IN
SURFACE TREATMENTPASSIVATE OVERALL
MATERIALSTEEL COMP 410 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
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 6661522-58?
6661522-58 is a WASHER,SLOTTED.
What is the NSN for 6661522-58?
6661522-58 is cataloged in the U.S. Government catalog under NSN 5310-00-113-6728. 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.