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Technical Data Sheet
PartsTable / COMPONENT / A20430
A20430 ✓ 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,RECESSED is a the manufacturer industrial component. Key specifications include material: STEEL COMP 8750 OVERALL, recess_angle: 90.0 DEGREES NOMINAL, hole_diameter: 0.788 INCHES MINIMUM AND 0.790 INCHES MAXIMUM IN, hardness_rating: 40.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM, recess_diameter: 0.849 INCHES MINIMUM AND 0.869 INCHES MAXIMUM IN, outside_diameter: 1.125 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-596-6650, 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
A20430
NSN: 5310-00-596-6650
FSC: 5310
CAGE: 48521 — COLT INDUSTRIES OPERATING CORP PRATT AND WHITNEY MACHINE TOOL DIV
SPECIFICATIONS
materialSTEEL COMP 8750 OVERALL
recess_angle90.0 DEGREES NOMINAL
hole_diameter0.788 INCHES MINIMUM AND 0.790 INCHES MAXIMUM IN
hardness_rating40.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM
recess_diameter0.849 INCHES MINIMUM AND 0.869 INCHES MAXIMUM IN
outside_diameter1.125 INCHES NOMINAL IN
style_designatorRECESSED
material_thickness0.060 INCHES MINIMUM AND 0.064 INCHES MAXIMUM IN
material_document_and_classificationAMS 6328 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-596-6650
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: A20430 · 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
•
STYLE DESIGNATOR: RECESSED
•
HARDNESS RATING: 40.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM
•
MATERIAL: STEEL COMP 8750 OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 6328 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
MATERIAL THICKNESS: 0.060 INCHES MINIMUM AND 0.064 INCHES MAXIMUM IN
•
HOLE DIAMETER: 0.788 INCHES MINIMUM AND 0.790 INCHES MAXIMUM IN
•
RECESS ANGLE: 90.0 DEGREES NOMINAL
•
OUTSIDE DIAMETER: 1.125 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
STYLE DESIGNATORRECESSED
HARDNESS RATING40.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM
MATERIALSTEEL COMP 8750 OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 6328 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
MATERIAL THICKNESS0.060 INCHES MINIMUM AND 0.064 INCHES MAXIMUM IN
HOLE DIAMETER0.788 INCHES MINIMUM AND 0.790 INCHES MAXIMUM IN
RECESS ANGLE90.0 DEGREES NOMINAL
OUTSIDE DIAMETER1.125 INCHES NOMINAL IN
RECESS DIAMETER0.849 INCHES MINIMUM AND 0.869 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 16
ASC25-DInterchangeable
interchangeable cross-reference
interchangeable
CSA-46183Interchangeable
interchangeable cross-reference
interchangeable
20430Interchangeable
interchangeable cross-reference
interchangeable
CV9S4700-71ALT1PC757Interchangeable
interchangeable cross-reference
interchangeable
D15-653BPC717Interchangeable
interchangeable cross-reference
interchangeable
D15-653JPC717Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A20430?
A20430 is a WASHER,RECESSED.
What parts can replace A20430?
There are 16 known substitutes for A20430: ASC25-D, CSA-46183, 20430 and 13 more. Substitute compatibility should be verified for your specific system.
Is A20430 still available?
A20430 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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Last verified: July 2026