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A75571 — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

A75571: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, hole_diameter: 0.312 INCHES MINIMUM AND 0.322 INCHES MAXIMUM IN, overall_diameter: 0.531 INCHES MINIMUM AND 0.593 INCHES MAXIMUM IN, surface_treatment: CADMIUM OVERALL, peripheral_shape_style: ROUND, center_hole_shape_style: ROUND W/FLATS. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-545-5297, 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
A75571
NSN: 5310-00-545-5297
FSC: 5310 — Nuts and Washers
CAGE: 78943 — TRIUMPH THERMAL SYSTEMS, LLC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
hole_diameter0.312 INCHES MINIMUM AND 0.322 INCHES MAXIMUM IN
overall_diameter0.531 INCHES MINIMUM AND 0.593 INCHES MAXIMUM IN
surface_treatmentCADMIUM OVERALL
peripheral_shape_styleROUND
center_hole_shape_styleROUND W/FLATS
minimum_tensile_strength160000 POUNDS PER SQUARE INCH LBS
cross-sectional_shape_styleRECTANGULAR
surface_treatment_document_and_classificationAN-P-61 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5310-00-545-5297
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: A75571 · 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: AN-P-61 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
OVERALL DIAMETER: 0.531 INCHES MINIMUM AND 0.593 INCHES MAXIMUM IN
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
SURFACE TREATMENT: CADMIUM OVERALL
•
MINIMUM TENSILE STRENGTH: 160000 POUNDS PER SQUARE INCH LBS
•
PERIPHERAL SHAPE STYLE: ROUND
•
MATERIAL: STEEL OVERALL
•
CENTER HOLE SHAPE STYLE: ROUND W/FLATS
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONAN-P-61 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
OVERALL DIAMETER0.531 INCHES MINIMUM AND 0.593 INCHES MAXIMUM IN
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
SURFACE TREATMENTCADMIUM OVERALL
MINIMUM TENSILE STRENGTH160000 POUNDS PER SQUARE INCH LBS
PERIPHERAL SHAPE STYLEROUND
MATERIALSTEEL OVERALL
CENTER HOLE SHAPE STYLEROUND W/FLATS
HOLE DIAMETER0.312 INCHES MINIMUM AND 0.322 INCHES MAXIMUM IN
SUBSTITUTES & CROSS-REFERENCES 1
S59-166Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is A75571?
A75571 is a WASHER,FLAT.
What parts can replace A75571?
There is 1 known substitute for A75571: S59-166. Substitute compatibility should be verified for your specific system.
What is the NSN for A75571?
A75571 is cataloged in the U.S. Government catalog under NSN 5310-00-545-5297. 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.