PartsTable
Technical Data Sheet
PartsTable / COMPONENT / 503-4-10364-000
503-4-10364-000 ✓ 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,FLAT is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, thickness: 0.115 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN, hole_diameter: 0.318 INCHES MINIMUM AND 0.338 INCHES MAXIMUM IN, hardness_rating: 90.0 ROCKWELL K MINIMUM OR 167.0 ROCKWELL K MAXIMUM, overall_diameter: 0.709 INCHES MINIMUM AND 0.729 INCHES MAXIMUM IN, features_provided: CASEHARDENED. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-778-0261, 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
503-4-10364-000
NSN: 5310-00-778-0261
FSC: 5310
CAGE: K2523 — EATON LIMITED (GBR)
SPECIFICATIONS
materialSTEEL OVERALL
thickness0.115 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN
hole_diameter0.318 INCHES MINIMUM AND 0.338 INCHES MAXIMUM IN
hardness_rating90.0 ROCKWELL K MINIMUM OR 167.0 ROCKWELL K MAXIMUM
overall_diameter0.709 INCHES MINIMUM AND 0.729 INCHES MAXIMUM IN
features_providedCASEHARDENED
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
NSN5310-00-778-0261
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 503-4-10364-000 · 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
•
FEATURES PROVIDED: CASEHARDENED
•
OVERALL DIAMETER: 0.709 INCHES MINIMUM AND 0.729 INCHES MAXIMUM IN
•
MATERIAL: STEEL OVERALL
•
PERIPHERAL SHAPE STYLE: ROUND
•
HARDNESS RATING: 90.0 ROCKWELL K MINIMUM OR 167.0 ROCKWELL K MAXIMUM
•
CENTER HOLE SHAPE STYLE: ROUND
•
HOLE DIAMETER: 0.318 INCHES MINIMUM AND 0.338 INCHES MAXIMUM IN
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
TECHNICAL CHARACTERISTICS (FLIS)
FEATURES PROVIDEDCASEHARDENED
OVERALL DIAMETER0.709 INCHES MINIMUM AND 0.729 INCHES MAXIMUM IN
MATERIALSTEEL OVERALL
PERIPHERAL SHAPE STYLEROUND
HARDNESS RATING90.0 ROCKWELL K MINIMUM OR 167.0 ROCKWELL K MAXIMUM
CENTER HOLE SHAPE STYLEROUND
HOLE DIAMETER0.318 INCHES MINIMUM AND 0.338 INCHES MAXIMUM IN
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
THICKNESS0.115 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 13
220534Interchangeable
interchangeable cross-reference
interchangeable
220530-4Interchangeable
interchangeable cross-reference
interchangeable
50950Interchangeable
interchangeable cross-reference
interchangeable
695832-3Interchangeable
interchangeable cross-reference
interchangeable
4820PL2024365Interchangeable
interchangeable cross-reference
interchangeable
24C117-1Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 503-4-10364-000?
503-4-10364-000 is a WASHER,FLAT.
What parts can replace 503-4-10364-000?
There are 13 known substitutes for 503-4-10364-000: 220534, 220530-4, 50950 and 10 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 503-4-10364-000?
503-4-10364-000 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-778-0261. This indicates validated use in U.S. government and defense supply chains.
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PartsTable Design LLC · partstable.com
Last verified: July 2026