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Technical Data Sheet
PartsTable / COMPONENT / 88-20564-12
88-20564-12 ✓ 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 thickness: 0.059 INCHES MINIMUM AND 0.067 INCHES MAXIMUM IN, hole_diameter: 0.324 INCHES MINIMUM AND 0.344 INCHES MAXIMUM IN, overall_diameter: 0.995 INCHES MINIMUM AND 1.010 INCHES MAXIMUM IN, surface_treatment: CADMIUM OR ZINC OVERALL, peripheral_shape_style: ROUND, center_hole_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 5310-00-044-6477, 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
88-20564-12
NSN: 5310-00-044-6477
FSC: 5310
CAGE: 30554 — DEPARTMENT OF DEFENSE PROJECT MANAGER-MOBILE ELECTRIC POWER (USA)
SPECIFICATIONS
materialSTEEL COMP 1010 OR STEEL COMP 1015 OR STEEL COMP 1016 OR STEEL COMP 1018 OR STEEL COMP 1019 OR STEEL COMP 1020 OVERALL
thickness0.059 INCHES MINIMUM AND 0.067 INCHES MAXIMUM IN
hole_diameter0.324 INCHES MINIMUM AND 0.344 INCHES MAXIMUM IN
overall_diameter0.995 INCHES MINIMUM AND 1.010 INCHES MAXIMUM IN
surface_treatmentCADMIUM OR ZINC OVERALL
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
nondefinitive_spec/std_dataA TYPE
departure_from_cited_documentAS MODIFIED BY SURFACE TREATMENT
material_document_and_classificationASTM A108 ASSN STD ALL MATERIAL RESPONSES OVERALL
NSN5310-00-044-6477
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 88-20564-12 · 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
•
MATERIAL: STEEL COMP 1010 OR STEEL COMP 1015 OR STEEL COMP 1016 OR STEEL COMP 1018 OR STEEL COMP 1019 OR STEEL COMP 1020 OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM A108 ASSN STD ALL MATERIAL RESPONSES OVERALL
•
DEPARTURE FROM CITED DOCUMENT: AS MODIFIED BY SURFACE TREATMENT
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
OVERALL DIAMETER: 0.995 INCHES MINIMUM AND 1.010 INCHES MAXIMUM IN
•
SURFACE TREATMENT: CADMIUM OR ZINC OVERALL
•
HOLE DIAMETER: 0.324 INCHES MINIMUM AND 0.344 INCHES MAXIMUM IN
•
CENTER HOLE SHAPE STYLE: ROUND
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALSTEEL COMP 1010 OR STEEL COMP 1015 OR STEEL COMP 1016 OR STEEL COMP 1018 OR STEEL COMP 1019 OR STEEL COMP 1020 OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A108 ASSN STD ALL MATERIAL RESPONSES OVERALL
DEPARTURE FROM CITED DOCUMENTAS MODIFIED BY SURFACE TREATMENT
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
OVERALL DIAMETER0.995 INCHES MINIMUM AND 1.010 INCHES MAXIMUM IN
SURFACE TREATMENTCADMIUM OR ZINC OVERALL
HOLE DIAMETER0.324 INCHES MINIMUM AND 0.344 INCHES MAXIMUM IN
CENTER HOLE SHAPE STYLEROUND
NONDEFINITIVE SPEC/STD DATAA TYPE
PERIPHERAL SHAPE STYLEROUND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 24
MS27183-10Interchangeable
interchangeable cross-reference
interchangeable
G9419274Interchangeable
interchangeable cross-reference
interchangeable
1DD598Interchangeable
interchangeable cross-reference
interchangeable
88-20033Interchangeable
interchangeable cross-reference
interchangeable
HFLW025EGInterchangeable
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 88-20564-12?
88-20564-12 is a WASHER,FLAT.
What parts can replace 88-20564-12?
There are 24 known substitutes for 88-20564-12: MS27183-10, G9419274, 1DD598 and 21 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 88-20564-12?
88-20564-12 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-044-6477. 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