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A528-9-11 — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

A528-9-11: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include material: STEEL OR STEEL COMP 1566 OR STEEL COMP 1070 OR STEEL COMP 1080 OR STEEL COMP 1090 OVERALL, thickness: 0.093 INCHES MINIMUM AND 0.121 INCHES MAXIMUM IN, hole_diameter: 1.971 INCHES MINIMUM AND 1.983 INCHES MAXIMUM IN, overall_diameter: 2.422 INCHES MINIMUM AND 2.436 INCHES MAXIMUM IN, surface_treatment: CADMIUM AND CHROMATE OVERALL, peripheral_shape_style: ROUND. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-373-5992, 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
A528-9-11
NSN: 5310-01-373-5992
FSC: 5310 — Nuts and Washers
CAGE: 86928 — SEASTROM MANUFACTURING CO INC (USA)
SPECIFICATIONS
materialSTEEL OR STEEL COMP 1566 OR STEEL COMP 1070 OR STEEL COMP 1080 OR STEEL COMP 1090 OVERALL
thickness0.093 INCHES MINIMUM AND 0.121 INCHES MAXIMUM IN
hole_diameter1.971 INCHES MINIMUM AND 1.983 INCHES MAXIMUM IN
overall_diameter2.422 INCHES MINIMUM AND 2.436 INCHES MAXIMUM IN
surface_treatmentCADMIUM AND CHROMATE OVERALL
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
material_document_and_classificationFED-STD-66 ASSN STD 1ST MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationQQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5310-01-373-5992
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: A528-9-11 · 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
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
OVERALL DIAMETER: 2.422 INCHES MINIMUM AND 2.436 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: FED-STD-66 ASSN STD 1ST MATERIAL RESPONSE OVERALL
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
SURFACE TREATMENT: CADMIUM AND CHROMATE OVERALL
•
PERIPHERAL SHAPE STYLE: ROUND
•
MATERIAL: STEEL OR STEEL COMP 1566 OR STEEL COMP 1070 OR STEEL COMP 1080 OR STEEL COMP 1090 OVERALL
•
CENTER HOLE SHAPE STYLE: ROUND
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
OVERALL DIAMETER2.422 INCHES MINIMUM AND 2.436 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONFED-STD-66 ASSN STD 1ST MATERIAL RESPONSE OVERALL
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
SURFACE TREATMENTCADMIUM AND CHROMATE OVERALL
PERIPHERAL SHAPE STYLEROUND
MATERIALSTEEL OR STEEL COMP 1566 OR STEEL COMP 1070 OR STEEL COMP 1080 OR STEEL COMP 1090 OVERALL
CENTER HOLE SHAPE STYLEROUND
HOLE DIAMETER1.971 INCHES MINIMUM AND 1.983 INCHES MAXIMUM IN
THICKNESS0.093 INCHES MINIMUM AND 0.121 INCHES MAXIMUM IN
OTHER ITEMS IN FSC 5310 — Nuts and Washers
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5310-00-000-0040 5310-00-000-0077 5310-00-000-0079 5310-00-000-1146 5310-00-000-3815 5310-00-000-4532 5310-00-000-4540
SUBSTITUTES & CROSS-REFERENCES 1
723205-11Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is A528-9-11?
A528-9-11 is a WASHER,FLAT.
What parts can replace A528-9-11?
There is 1 known substitute for A528-9-11: 723205-11. Substitute compatibility should be verified for your specific system.
What is the NSN for A528-9-11?
A528-9-11 is cataloged in the U.S. Government catalog under NSN 5310-01-373-5992. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.