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643669 — WASHER,KEY

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

643669: WASHER,KEY.

The WASHER,KEY is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, hole_diameter: 0.266 INCHES NOMINAL IN, outside_diameter: 0.436 INCHES NOMINAL IN, split_key_length: 0.125 INCHES NOMINAL IN, style_designator: KEY, surface_treatment: PASSIVATE OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-756-4403, 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
643669
NSN: 5310-00-756-4403
FSC: 5310 — Nuts and Washers
CAGE: 45934 — ONTIC ENGINEERING & MANUFACTURING, INC DBA ONTIC US (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
hole_diameter0.266 INCHES NOMINAL IN
outside_diameter0.436 INCHES NOMINAL IN
split_key_length0.125 INCHES NOMINAL IN
style_designatorKEY
surface_treatmentPASSIVATE OVERALL
material_thickness0.018 INCHES NOMINAL IN
external_key_quantity1
external_prebent_key_width0.200 INCHES NOMINAL IN
external_tapered_key_width0.142 INCHES NOMINAL IN
angle_between_external_keys45.0 DEGREES NOMINAL
external_prebent_key_length0.062 INCHES NOMINAL IN
NSN5310-00-756-4403
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 643669 · 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
•
DISTANCE FROM CENTERLINE TO INSIDE OF PREBENT KEY: 0.243 INCHES NOMINAL IN
•
SPLIT KEY LENGTH: 0.125 INCHES NOMINAL IN
•
EXTERNAL PREBENT KEY LENGTH: 0.062 INCHES NOMINAL IN
•
OVERALL DISTANCE INCLUDING KEYS: 0.583 INCHES NOMINAL IN
•
STYLE DESIGNATOR: KEY
•
OUTSIDE DIAMETER: 0.436 INCHES NOMINAL IN
•
EXTERNAL TAPERED KEY WIDTH: 0.142 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.018 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
DISTANCE FROM CENTERLINE TO INSIDE OF PREBENT KEY0.243 INCHES NOMINAL IN
SPLIT KEY LENGTH0.125 INCHES NOMINAL IN
EXTERNAL PREBENT KEY LENGTH0.062 INCHES NOMINAL IN
OVERALL DISTANCE INCLUDING KEYS0.583 INCHES NOMINAL IN
STYLE DESIGNATORKEY
OUTSIDE DIAMETER0.436 INCHES NOMINAL IN
EXTERNAL TAPERED KEY WIDTH0.142 INCHES NOMINAL IN
MATERIAL THICKNESS0.018 INCHES NOMINAL IN
EXTERNAL KEY QUANTITY1
SURFACE TREATMENTPASSIVATE 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 643669?
643669 is a WASHER,KEY.
What is the NSN for 643669?
643669 is cataloged in the U.S. Government catalog under NSN 5310-00-756-4403. 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.