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PartsTable / COMPONENT / MS20066-2
MS20066-2 ✓ Verified by PartsTable
— · NUT WASHER
WHAT YOU NEED TO KNOW
Match nut grade to bolt grade for full strength Lock nuts prevent loosening under vibration
Don't mix grades — weakens the joint
PRODUCT OVERVIEW

The KEY,MACHINE is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, overall_width: 0.0625 INCHES MINIMUM AND 0.0635 INCHES MAXIMUM IN, overall_height: 0.0625 INCHES MINIMUM AND 0.0635 INCHES MAXIMUM IN, overall_length: 0.302 INCHES MINIMUM AND 0.322 INCHES MAXIMUM IN, style_designator: PLAIN, surface_treatment: PASSIVATE OVERALL. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-728-9394, 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
MS20066-2
NSN: 5315-00-728-9394
FSC: 5315
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
overall_width0.0625 INCHES MINIMUM AND 0.0635 INCHES MAXIMUM IN
overall_height0.0625 INCHES MINIMUM AND 0.0635 INCHES MAXIMUM IN
overall_length0.302 INCHES MINIMUM AND 0.322 INCHES MAXIMUM IN
style_designatorPLAIN
surface_treatmentPASSIVATE OVERALL
starting_edge_shapeSTRAIGHT
nondefinitive_spec/std_data2 TYPE AND 1 STYLE AND A GRADE
material_document_and_classification66,400 SERIES FED STD SINGLE MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5315-00-728-9394
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MS20066-2 · 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
•
STYLE DESIGNATOR: PLAIN
•
MATERIAL DOCUMENT AND CLASSIFICATION: 66,400 SERIES FED STD SINGLE MATERIAL RESPONSE OVERALL
•
MATERIAL: STEEL CORROSION RESISTING OVERALL
•
NONDEFINITIVE SPEC/STD DATA: 2 TYPE AND 1 STYLE AND A GRADE
•
STARTING EDGE SHAPE: STRAIGHT
TECHNICAL CHARACTERISTICS (FLIS)
STYLE DESIGNATORPLAIN
MATERIAL DOCUMENT AND CLASSIFICATION66,400 SERIES FED STD SINGLE MATERIAL RESPONSE OVERALL
MATERIALSTEEL CORROSION RESISTING OVERALL
OVERALL HEIGHT0.0625 INCHES MINIMUM AND 0.0635 INCHES MAXIMUM IN
NONDEFINITIVE SPEC/STD DATA2 TYPE AND 1 STYLE AND A GRADE
STARTING EDGE SHAPESTRAIGHT
OVERALL LENGTH0.302 INCHES MINIMUM AND 0.322 INCHES MAXIMUM IN
OVERALL WIDTH0.0625 INCHES MINIMUM AND 0.0635 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
SURFACE TREATMENTPASSIVATE OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
MS20066-544Interchangeable
interchangeable cross-reference
interchangeable
NASM20066Interchangeable
interchangeable cross-reference
interchangeable
55-22081 PART 2Interchangeable
interchangeable cross-reference
interchangeable
MB423Interchangeable
interchangeable cross-reference
interchangeable
MS20066-405Interchangeable
interchangeable cross-reference
interchangeable
OO-K-220Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS20066-2?
MS20066-2 is a KEY,MACHINE.
What parts can replace MS20066-2?
There are 9 known substitutes for MS20066-2: MS20066-544, NASM20066, 55-22081 PART 2 and 6 more. Substitute compatibility should be verified for your specific system.
Is MS20066-2 still available?
MS20066-2 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026