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4S9-4 — WASHER,LOCK

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

4S9-4: WASHER,LOCK.

The WASHER,LOCK is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, hole_diameter: 0.341 INCHES MINIMUM AND 0.348 INCHES MAXIMUM IN, outside_diameter: 0.513 INCHES MINIMUM AND 0.519 INCHES MAXIMUM IN, style_designator: FLAT INTERNAL TEETH, surface_treatment: TIN OVERALL, material_thickness: 0.018 INCHES MINIMUM AND 0.022 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-773-7611, 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
4S9-4
NSN: 5310-00-773-7611
FSC: 5310 — Nuts and Washers
CAGE: 71286 — HOWMET GLOBAL FASTENING SYSTEMS INC DIV CAMLOC PRODUCTS (USA)
SPECIFICATIONS
materialSTEEL OVERALL
hole_diameter0.341 INCHES MINIMUM AND 0.348 INCHES MAXIMUM IN
outside_diameter0.513 INCHES MINIMUM AND 0.519 INCHES MAXIMUM IN
style_designatorFLAT INTERNAL TEETH
surface_treatmentTIN OVERALL
material_thickness0.018 INCHES MINIMUM AND 0.022 INCHES MAXIMUM IN
surface_treatment_document_and_classificationAMS 2408-3 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
NSN5310-00-773-7611
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 4S9-4 · 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: AMS 2408-3 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
•
STYLE DESIGNATOR: FLAT INTERNAL TEETH
•
OUTSIDE DIAMETER: 0.513 INCHES MINIMUM AND 0.519 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.018 INCHES MINIMUM AND 0.022 INCHES MAXIMUM IN
•
SURFACE TREATMENT: TIN OVERALL
•
MATERIAL: STEEL OVERALL
•
HOLE DIAMETER: 0.341 INCHES MINIMUM AND 0.348 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONAMS 2408-3 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
STYLE DESIGNATORFLAT INTERNAL TEETH
OUTSIDE DIAMETER0.513 INCHES MINIMUM AND 0.519 INCHES MAXIMUM IN
MATERIAL THICKNESS0.018 INCHES MINIMUM AND 0.022 INCHES MAXIMUM IN
SURFACE TREATMENTTIN OVERALL
MATERIALSTEEL OVERALL
HOLE DIAMETER0.341 INCHES MINIMUM AND 0.348 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: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 4S9-4?
4S9-4 is a WASHER,LOCK.
What is the NSN for 4S9-4?
4S9-4 is cataloged in the U.S. Government catalog under NSN 5310-00-773-7611. 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.