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6435-20179-101 — WASHER,RECESSED

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

6435-20179-101: WASHER,RECESSED.

The WASHER,RECESSED is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, hole_diameter: 0.505 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN, surface_finish: 100.0 MICROINCHES ALL SURFACES, hardness_rating: 34.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM, outside_diameter: 1.240 INCHES MINIMUM AND 1.260 INCHES MAXIMUM IN, special_features: EXTEREME OUTER EDGES OFBOTH BEARING SURFACES ROUNDED. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-900-3368, 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
6435-20179-101
NSN: 5310-00-900-3368
FSC: 5310 — Nuts and Washers
CAGE: 78286 — SIKORSKY AIRCRAFT CORPORATION DBA SIKORSKY AIRCRAFT CORP (USA)
SPECIFICATIONS
materialSTEEL OVERALL
hole_diameter0.505 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN
surface_finish100.0 MICROINCHES ALL SURFACES
hardness_rating34.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM
outside_diameter1.240 INCHES MINIMUM AND 1.260 INCHES MAXIMUM IN
special_featuresEXTEREME OUTER EDGES OFBOTH BEARING SURFACES ROUNDED
style_designatorRECESSED BOTH SIDES
top_recess_angle90.0 DEGREES NOMINAL
surface_treatmentCADMIUM OVERALL
material_thickness0.177 INCHES MINIMUM AND 0.180 INCHES MAXIMUM IN
bottom_recess_angle90.0 DEGREES NOMINAL
top_recess_diameter0.604 INCHES MINIMUM AND 0.620 INCHES MAXIMUM IN
NSN5310-00-900-3368
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 6435-20179-101 · 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: 100.0 MICROINCHES ALL SURFACES
•
TOP RECESS DIAMETER: 0.604 INCHES MINIMUM AND 0.620 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
BOTTOM RECESS DIAMETER: 0.604 INCHES MINIMUM AND 0.620 INCHES MAXIMUM IN
•
HARDNESS RATING: 34.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM
•
CRITICALITY CODE JUSTIFICATION: FEAT
•
TOP RECESS ANGLE: 90.0 DEGREES NOMINAL
•
STYLE DESIGNATOR: RECESSED BOTH SIDES
TECHNICAL CHARACTERISTICS
SURFACE FINISH100.0 MICROINCHES ALL SURFACES
TOP RECESS DIAMETER0.604 INCHES MINIMUM AND 0.620 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
BOTTOM RECESS DIAMETER0.604 INCHES MINIMUM AND 0.620 INCHES MAXIMUM IN
HARDNESS RATING34.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM
CRITICALITY CODE JUSTIFICATIONFEAT
TOP RECESS ANGLE90.0 DEGREES NOMINAL
STYLE DESIGNATORRECESSED BOTH SIDES
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-5000 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER1.240 INCHES MINIMUM AND 1.260 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 6435-20179-101?
6435-20179-101 is a WASHER,RECESSED.
What is the NSN for 6435-20179-101?
6435-20179-101 is cataloged in the U.S. Government catalog under NSN 5310-00-900-3368. 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.