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MD3659723 — WASHER,KEY

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

MD3659723: WASHER,KEY.

The WASHER,KEY is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1010 OVERALL, hole_diameter: 2.646 INCHES MINIMUM AND 2.666 INCHES MAXIMUM IN, heat_treatment: QUENCHED, outside_diameter: 3.615 INCHES MINIMUM AND 3.635 INCHES MAXIMUM IN, style_designator: KEY, features_provided: CASEHARDENED. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-447-2676, 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
MD3659723
NSN: 5310-00-447-2676
FSC: 5310 — Nuts and Washers
CAGE: 02386 — HIGHLAND AUTO & TRUCK SUPPLY (USA)
SPECIFICATIONS
materialSTEEL COMP 1010 OVERALL
hole_diameter2.646 INCHES MINIMUM AND 2.666 INCHES MAXIMUM IN
heat_treatmentQUENCHED
outside_diameter3.615 INCHES MINIMUM AND 3.635 INCHES MAXIMUM IN
style_designatorKEY
features_providedCASEHARDENED
material_thickness0.1096 INCHES MINIMUM AND 0.1250 INCHES MAXIMUM IN
internal_key_quantity1
internal_straight_key_width0.334 INCHES MINIMUM AND 0.354 INCHES MAXIMUM IN
material_document_and_classificationQQ-S-633,CANC FED SPEC SINGLE MATERIAL RESPONSE OVERALL
distance_from_centerline_to_top_of_internal_key1.193 INCHES MINIMUM AND 1.213 INCHES MAXIMUM IN
NSN5310-00-447-2676
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MD3659723 · 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: 0.334 INCHES MINIMUM AND 0.354 INCHES MAXIMUM IN
•
DISTANCE FROM CENTERLINE TO TOP OF INTERNAL KEY: 1.193 INCHES MINIMUM AND 1.213 INCHES MAXIMUM IN
•
HEAT TREATMENT: QUENCHED
•
STYLE DESIGNATOR: KEY
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-633,CANC FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 3.615 INCHES MINIMUM AND 3.635 INCHES MAXIMUM IN
•
FEATURES PROVIDED: CASEHARDENED
•
MATERIAL THICKNESS: 0.1096 INCHES MINIMUM AND 0.1250 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
INTERNAL STRAIGHT KEY WIDTH0.334 INCHES MINIMUM AND 0.354 INCHES MAXIMUM IN
DISTANCE FROM CENTERLINE TO TOP OF INTERNAL KEY1.193 INCHES MINIMUM AND 1.213 INCHES MAXIMUM IN
HEAT TREATMENTQUENCHED
STYLE DESIGNATORKEY
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-633,CANC FED SPEC SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER3.615 INCHES MINIMUM AND 3.635 INCHES MAXIMUM IN
FEATURES PROVIDEDCASEHARDENED
MATERIAL THICKNESS0.1096 INCHES MINIMUM AND 0.1250 INCHES MAXIMUM IN
MATERIALSTEEL COMP 1010 OVERALL
INTERNAL KEY QUANTITY1
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
3659723Reference 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 MD3659723?
MD3659723 is a WASHER,KEY.
What parts can replace MD3659723?
There is 1 known substitute for MD3659723: 3659723. Substitute compatibility should be verified for your specific system.
What is the NSN for MD3659723?
MD3659723 is cataloged in the U.S. Government catalog under NSN 5310-00-447-2676. 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.