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Technical Data Sheet
PartsTable / COMPONENT / 88-20564-5
88-20564-5 ✓ 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: 0.064 INCHES MINIMUM AND 0.104 INCHES MAXIMUM IN, hole_diameter: 0.495 INCHES MINIMUM AND 0.515 INCHES MAXIMUM IN, hardness_rating: 34.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM, overall_diameter: 1.243 INCHES MINIMUM AND 1.280 INCHES MAXIMUM IN, surface_treatment: ZINC AND CHROMATE 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 5310-01-267-1685, 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
88-20564-5
NSN: 5310-01-267-1685
FSC: 5310
CAGE: 30554 — DEPARTMENT OF DEFENSE PROJECT MANAGER-MOBILE ELECTRIC POWER (USA)
SPECIFICATIONS
materialSTEEL COMP 1008 OR STEEL COMP 1010 OR STEEL COMP 1015 OR STEEL COMP 1016 OR STEEL COMP 1017 OR STEEL COMP 1018 OR STEEL COMP 1019 OR STEEL COMP 1020 OVERALL
thickness0.064 INCHES MINIMUM AND 0.104 INCHES MAXIMUM IN
hole_diameter0.495 INCHES MINIMUM AND 0.515 INCHES MAXIMUM IN
hardness_rating34.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM
overall_diameter1.243 INCHES MINIMUM AND 1.280 INCHES MAXIMUM IN
surface_treatmentZINC AND CHROMATE OVERALL
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
nondefinitive_spec/std_dataA TYPE AND 1 GRADE AND A CLASS
material_document_and_classificationASTM A108 ASSN STD ALL MATERIAL RESPONSES OVERALL
surface_treatment_document_and_classificationASTM B633,TY 2 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
NSN5310-01-267-1685
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 88-20564-5 · 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
•
CENTER HOLE SHAPE STYLE: ROUND
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM A108 ASSN STD ALL MATERIAL RESPONSES OVERALL
•
MATERIAL: STEEL COMP 1008 OR STEEL COMP 1010 OR STEEL COMP 1015 OR STEEL COMP 1016 OR STEEL COMP 1017 OR STEEL COMP 1018 OR STEEL COMP 1019 OR STEEL COMP 1020 OVERALL
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
SURFACE TREATMENT: ZINC AND CHROMATE OVERALL
•
NONDEFINITIVE SPEC/STD DATA: A TYPE AND 1 GRADE AND A CLASS
•
THICKNESS: 0.064 INCHES MINIMUM AND 0.104 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: ASTM B633,TY 2 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
CENTER HOLE SHAPE STYLEROUND
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A108 ASSN STD ALL MATERIAL RESPONSES OVERALL
MATERIALSTEEL COMP 1008 OR STEEL COMP 1010 OR STEEL COMP 1015 OR STEEL COMP 1016 OR STEEL COMP 1017 OR STEEL COMP 1018 OR STEEL COMP 1019 OR STEEL COMP 1020 OVERALL
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
SURFACE TREATMENTZINC AND CHROMATE OVERALL
NONDEFINITIVE SPEC/STD DATAA TYPE AND 1 GRADE AND A CLASS
THICKNESS0.064 INCHES MINIMUM AND 0.104 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONASTM B633,TY 2 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
OVERALL DIAMETER1.243 INCHES MINIMUM AND 1.280 INCHES MAXIMUM IN
HARDNESS RATING34.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM
VERIFIED SUBSTITUTES & CROSS-REFERENCES 22
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 88-20564-5?
88-20564-5 is a WASHER,FLAT.
What parts can replace 88-20564-5?
There are 22 known substitutes for 88-20564-5: 88-20564-12, 88-20033-25A, MS51412-25 and 19 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 88-20564-5?
88-20564-5 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-267-1685. This indicates validated use in U.S. government and defense supply chains.
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Last verified: July 2026