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A45A28 — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

A45A28: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include material: COPPER OVERALL, thickness: 0.035 INCHES MINIMUM AND 0.045 INCHES MAXIMUM IN, hole_diameter: 0.255 INCHES MINIMUM AND 0.265 INCHES MAXIMUM IN, overall_diameter: 0.557 INCHES MINIMUM AND 0.567 INCHES MAXIMUM IN, surface_treatment: CADMIUM OR ZINC OVERALL, peripheral_shape_style: ROUND. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-262-6217, 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
A45A28
NSN: 5310-00-262-6217
FSC: 5310 — Nuts and Washers
CAGE: 58588 — SURFACE COMBUSTION INC (USA)
SPECIFICATIONS
materialCOPPER OVERALL
thickness0.035 INCHES MINIMUM AND 0.045 INCHES MAXIMUM IN
hole_diameter0.255 INCHES MINIMUM AND 0.265 INCHES MAXIMUM IN
overall_diameter0.557 INCHES MINIMUM AND 0.567 INCHES MAXIMUM IN
surface_treatmentCADMIUM OR ZINC OVERALL
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
NSN5310-00-262-6217
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: A45A28 · 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: 0.557 INCHES MINIMUM AND 0.567 INCHES MAXIMUM IN
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
SURFACE TREATMENT: CADMIUM OR ZINC OVERALL
•
PERIPHERAL SHAPE STYLE: ROUND
•
MATERIAL: COPPER OVERALL
•
CENTER HOLE SHAPE STYLE: ROUND
•
HOLE DIAMETER: 0.255 INCHES MINIMUM AND 0.265 INCHES MAXIMUM IN
•
THICKNESS: 0.035 INCHES MINIMUM AND 0.045 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
OVERALL DIAMETER0.557 INCHES MINIMUM AND 0.567 INCHES MAXIMUM IN
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
SURFACE TREATMENTCADMIUM OR ZINC OVERALL
PERIPHERAL SHAPE STYLEROUND
MATERIALCOPPER OVERALL
CENTER HOLE SHAPE STYLEROUND
HOLE DIAMETER0.255 INCHES MINIMUM AND 0.265 INCHES MAXIMUM IN
THICKNESS0.035 INCHES MINIMUM AND 0.045 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

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is A45A28?
A45A28 is a WASHER,FLAT.
What is the NSN for A45A28?
A45A28 is cataloged in the U.S. Government catalog under NSN 5310-00-262-6217. 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.