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5265539 — WASHER,KEY

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

5265539: WASHER,KEY.

The WASHER,KEY is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1020 OVERALL, hole_diameter: 0.781 INCHES MINIMUM AND 0.786 INCHES MAXIMUM IN, outside_diameter: 2.169 INCHES MINIMUM AND 2.174 INCHES MAXIMUM IN, style_designator: KEY, surface_treatment: CADMIUM OVERALL, material_thickness: 0.120 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-526-5539, 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
5265539
NSN: 5310-00-526-5539
FSC: 5310 — Nuts and Washers
CAGE: 19204 — ARMY, UNITED STATES DEPARTMENT OF THE DBA ROCK ISLAND ARSENAL JMTC (USA)
SPECIFICATIONS
materialSTEEL COMP 1020 OVERALL
hole_diameter0.781 INCHES MINIMUM AND 0.786 INCHES MAXIMUM IN
outside_diameter2.169 INCHES MINIMUM AND 2.174 INCHES MAXIMUM IN
style_designatorKEY
surface_treatmentCADMIUM OVERALL
material_thickness0.120 INCHES NOMINAL IN
internal_key_quantity1
internal_straight_key_width0.174 INCHES MINIMUM AND 0.182 INCHES MAXIMUM IN
criticality_code_justificationAAUB AND ABKV AND ABLQ
material_document_and_classificationQQ-S-698 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationQQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
distance_from_centerline_to_top_of_internal_key0.063 INCHES MINIMUM AND 0.068 INCHES MAXIMUM IN
NSN5310-00-526-5539
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 5265539 · 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
•
INTERNAL STRAIGHT KEY WIDTH: 0.174 INCHES MINIMUM AND 0.182 INCHES MAXIMUM IN
•
DISTANCE FROM CENTERLINE TO TOP OF INTERNAL KEY: 0.063 INCHES MINIMUM AND 0.068 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
CRITICALITY CODE JUSTIFICATION: AAUB AND ABKV AND ABLQ
•
STYLE DESIGNATOR: KEY
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-698 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 2.169 INCHES MINIMUM AND 2.174 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.120 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
INTERNAL STRAIGHT KEY WIDTH0.174 INCHES MINIMUM AND 0.182 INCHES MAXIMUM IN
DISTANCE FROM CENTERLINE TO TOP OF INTERNAL KEY0.063 INCHES MINIMUM AND 0.068 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
CRITICALITY CODE JUSTIFICATIONAAUB AND ABKV AND ABLQ
STYLE DESIGNATORKEY
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-698 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER2.169 INCHES MINIMUM AND 2.174 INCHES MAXIMUM IN
MATERIAL THICKNESS0.120 INCHES NOMINAL IN
SURFACE TREATMENTCADMIUM OVERALL
MATERIALSTEEL COMP 1020 OVERALL
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
H17269Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 5265539?
5265539 is a WASHER,KEY.
What parts can replace 5265539?
There is 1 known substitute for 5265539: H17269. Substitute compatibility should be verified for your specific system.
What is the NSN for 5265539?
5265539 is cataloged in the U.S. Government catalog under NSN 5310-00-526-5539. 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.