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P4509 ✓ Verified by PartsTable
— · NUT WASHER
WHAT YOU NEED TO KNOW
Match nut grade to bolt grade for full strength Lock nuts prevent loosening under vibration
Don't mix grades — weakens the joint
PRODUCT OVERVIEW

The WASHER,SHOULDERED is a the manufacturer industrial component. Key specifications include material: RUBBER NATURAL OR RUBBER SYNTHETIC OVERALL, hole_diameter: 0.375 INCHES NOMINAL IN, shoulder_height: 0.031 INCHES NOMINAL IN, outside_diameter: 0.625 INCHES NOMINAL IN, style_designator: SHOULDERED, shoulder_diameter: 0.438 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-209-6018, 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
P4509
NSN: 5310-00-209-6018
FSC: 5310
CAGE: 98923 — TECHNICAL COMPONENTS CO INC SUB OF METHODE ELECTRONICS INC (USA)
SPECIFICATIONS
materialRUBBER NATURAL OR RUBBER SYNTHETIC OVERALL
hole_diameter0.375 INCHES NOMINAL IN
shoulder_height0.031 INCHES NOMINAL IN
outside_diameter0.625 INCHES NOMINAL IN
style_designatorSHOULDERED
shoulder_diameter0.438 INCHES NOMINAL IN
material_thickness0.031 INCHES NOMINAL IN
NSN5310-00-209-6018
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: P4509 · 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
•
SHOULDER DIAMETER: 0.438 INCHES NOMINAL IN
•
SHOULDER HEIGHT: 0.031 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.031 INCHES NOMINAL IN
•
OUTSIDE DIAMETER: 0.625 INCHES NOMINAL IN
•
HOLE DIAMETER: 0.375 INCHES NOMINAL IN
•
MATERIAL: RUBBER NATURAL OR RUBBER SYNTHETIC OVERALL
•
STYLE DESIGNATOR: SHOULDERED
TECHNICAL CHARACTERISTICS (FLIS)
SHOULDER DIAMETER0.438 INCHES NOMINAL IN
SHOULDER HEIGHT0.031 INCHES NOMINAL IN
MATERIAL THICKNESS0.031 INCHES NOMINAL IN
OUTSIDE DIAMETER0.625 INCHES NOMINAL IN
HOLE DIAMETER0.375 INCHES NOMINAL IN
MATERIALRUBBER NATURAL OR RUBBER SYNTHETIC OVERALL
STYLE DESIGNATORSHOULDERED
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
469-F-3/8X3/8Interchangeable
interchangeable cross-reference
interchangeable
469-F-6X6Interchangeable
interchangeable cross-reference
interchangeable
504257Interchangeable
interchangeable cross-reference
interchangeable
830204Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is P4509?
P4509 is a WASHER,SHOULDERED.
What parts can replace P4509?
There are 4 known substitutes for P4509: 469-F-3/8X3/8, 469-F-6X6, 504257 and 1 more. Substitute compatibility should be verified for your specific system.
Is P4509 still available?
P4509 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026