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U521713 — WASHER,KEY

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

U521713: WASHER,KEY.

The WASHER,KEY is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, hole_diameter: 0.937 INCHES NOMINAL IN, outside_diameter: 1.380 INCHES MINIMUM AND 1.390 INCHES MAXIMUM IN, style_designator: KEY, surface_treatment: PASSIVATE OVERALL, material_thickness: 0.058 INCHES MINIMUM AND 0.066 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-062-6027, 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
U521713
NSN: 5310-00-062-6027
FSC: 5310 — Nuts and Washers
CAGE: 78943 — TRIUMPH THERMAL SYSTEMS, LLC (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
hole_diameter0.937 INCHES NOMINAL IN
outside_diameter1.380 INCHES MINIMUM AND 1.390 INCHES MAXIMUM IN
style_designatorKEY
surface_treatmentPASSIVATE OVERALL
material_thickness0.058 INCHES MINIMUM AND 0.066 INCHES MAXIMUM IN
external_key_quantity1
external_straight_key_width0.228 INCHES NOMINAL IN
overall_distance_including_keys1.522 INCHES MINIMUM AND 1.542 INCHES MAXIMUM IN
NSN5310-00-062-6027
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: U521713 · 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 DISTANCE INCLUDING KEYS: 1.522 INCHES MINIMUM AND 1.542 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: KEY
•
OUTSIDE DIAMETER: 1.380 INCHES MINIMUM AND 1.390 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.058 INCHES MINIMUM AND 0.066 INCHES MAXIMUM IN
•
EXTERNAL STRAIGHT KEY WIDTH: 0.228 INCHES NOMINAL IN
•
EXTERNAL KEY QUANTITY: 1
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
MATERIAL: STEEL CORROSION RESISTING OVERALL
TECHNICAL CHARACTERISTICS
OVERALL DISTANCE INCLUDING KEYS1.522 INCHES MINIMUM AND 1.542 INCHES MAXIMUM IN
STYLE DESIGNATORKEY
OUTSIDE DIAMETER1.380 INCHES MINIMUM AND 1.390 INCHES MAXIMUM IN
MATERIAL THICKNESS0.058 INCHES MINIMUM AND 0.066 INCHES MAXIMUM IN
EXTERNAL STRAIGHT KEY WIDTH0.228 INCHES NOMINAL IN
EXTERNAL KEY QUANTITY1
SURFACE TREATMENTPASSIVATE OVERALL
MATERIALSTEEL CORROSION RESISTING OVERALL
HOLE DIAMETER0.937 INCHES NOMINAL 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: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is U521713?
U521713 is a WASHER,KEY.
What is the NSN for U521713?
U521713 is cataloged in the U.S. Government catalog under NSN 5310-00-062-6027. 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.