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Technical Data Sheet
PartsTable / COMPONENT / 88-20564-4
88-20564-4 ✓ 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: 0.064 INCHES MINIMUM AND 0.104 INCHES MAXIMUM IN, hole_diameter: 0.433 INCHES MINIMUM AND 0.453 INCHES MAXIMUM IN, overall_diameter: 0.993 INCHES MINIMUM AND 1.030 INCHES MAXIMUM IN, surface_treatment: ZINC OVERALL, peripheral_shape_style: ROUND. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-396-5840, 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
88-20564-4
NSN: 5310-01-396-5840
FSC: 5310
CAGE: 30554 — DEPARTMENT OF DEFENSE PROJECT MANAGER-MOBILE ELECTRIC POWER (USA)
SPECIFICATIONS
materialSTEEL OVERALL
thickness0.064 INCHES MINIMUM AND 0.104 INCHES MAXIMUM IN
hole_diameter0.433 INCHES MINIMUM AND 0.453 INCHES MAXIMUM IN
overall_diameter0.993 INCHES MINIMUM AND 1.030 INCHES MAXIMUM IN
surface_treatmentZINC OVERALL
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
NSN5310-01-396-5840
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 88-20564-4 · 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
•
OVERALL DIAMETER: 0.993 INCHES MINIMUM AND 1.030 INCHES MAXIMUM IN
•
SURFACE TREATMENT: ZINC OVERALL
•
HOLE DIAMETER: 0.433 INCHES MINIMUM AND 0.453 INCHES MAXIMUM IN
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
THICKNESS: 0.064 INCHES MINIMUM AND 0.104 INCHES MAXIMUM IN
•
CENTER HOLE SHAPE STYLE: ROUND
•
PERIPHERAL SHAPE STYLE: ROUND
•
MATERIAL: STEEL OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL DIAMETER0.993 INCHES MINIMUM AND 1.030 INCHES MAXIMUM IN
SURFACE TREATMENTZINC OVERALL
HOLE DIAMETER0.433 INCHES MINIMUM AND 0.453 INCHES MAXIMUM IN
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
THICKNESS0.064 INCHES MINIMUM AND 0.104 INCHES MAXIMUM IN
CENTER HOLE SHAPE STYLEROUND
PERIPHERAL SHAPE STYLEROUND
MATERIALSTEEL OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
88-20564-12Interchangeable
interchangeable cross-reference
interchangeable
88-20033-25AInterchangeable
interchangeable cross-reference
interchangeable
MS51412-25Interchangeable
interchangeable cross-reference
interchangeable
MS27183-10Interchangeable
interchangeable cross-reference
interchangeable
G9419274Interchangeable
interchangeable cross-reference
interchangeable
035106-7Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 88-20564-4?
88-20564-4 is a WASHER,FLAT.
What parts can replace 88-20564-4?
There are 21 known substitutes for 88-20564-4: 88-20564-12, 88-20033-25A, MS51412-25 and 18 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 88-20564-4?
88-20564-4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-396-5840. 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