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EF603W — WASHER,KEY

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

EF603W: WASHER,KEY.

The WASHER,KEY is a the manufacturer industrial component. Key specifications include material: STEEL COMP 302 OVERALL, hole_diameter: 0.158 INCHES NOMINAL IN, outside_diameter: 0.323 INCHES NOMINAL IN, style_designator: KEY, material_thickness: 0.018 INCHES NOMINAL IN, internal_prebent_key_length: 0.036 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-449-2529, 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
EF603W
NSN: 5310-01-449-2529
FSC: 5310 — Nuts and Washers
CAGE: U7941 — LEONARDO UK LIMITED (AW/EH101) (GBR)
SPECIFICATIONS
materialSTEEL COMP 302 OVERALL
hole_diameter0.158 INCHES NOMINAL IN
outside_diameter0.323 INCHES NOMINAL IN
style_designatorKEY
material_thickness0.018 INCHES NOMINAL IN
internal_prebent_key_length0.036 INCHES MAXIMUM IN
NSN5310-01-449-2529
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: EF603W · 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
•
STYLE DESIGNATOR: KEY
•
OUTSIDE DIAMETER: 0.323 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.018 INCHES NOMINAL IN
•
INTERNAL PREBENT KEY LENGTH: 0.036 INCHES MAXIMUM IN
•
MATERIAL: STEEL COMP 302 OVERALL
•
HOLE DIAMETER: 0.158 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
STYLE DESIGNATORKEY
OUTSIDE DIAMETER0.323 INCHES NOMINAL IN
MATERIAL THICKNESS0.018 INCHES NOMINAL IN
INTERNAL PREBENT KEY LENGTH0.036 INCHES MAXIMUM IN
MATERIALSTEEL COMP 302 OVERALL
HOLE DIAMETER0.158 INCHES NOMINAL 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
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is EF603W?
EF603W is a WASHER,KEY.
What is the NSN for EF603W?
EF603W is cataloged in the U.S. Government catalog under NSN 5310-01-449-2529. 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.