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Technical Data Sheet
PartsTable / COMPONENT / MS20066-191
MS20066-191 ✓ 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 OVERALL, overall_width: 0.1875 INCHES MINIMUM AND 0.1885 INCHES MAXIMUM IN, overall_height: 0.1875 INCHES MINIMUM AND 0.1885 INCHES MAXIMUM IN, overall_length: 1.990 INCHES MINIMUM AND 2.010 INCHES MAXIMUM IN, style_designator: PLAIN, starting_edge_shape: STRAIGHT. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-682-1811, 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
MS20066-191
NSN: 5315-00-682-1811
FSC: 5315
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL OVERALL
overall_width0.1875 INCHES MINIMUM AND 0.1885 INCHES MAXIMUM IN
overall_height0.1875 INCHES MINIMUM AND 0.1885 INCHES MAXIMUM IN
overall_length1.990 INCHES MINIMUM AND 2.010 INCHES MAXIMUM IN
style_designatorPLAIN
starting_edge_shapeSTRAIGHT
nondefinitive_spec/std_data2 TYPE AND 1 STYLE AND C GRADE
material_document_and_classification66 COMP 1018 TO 1035 FED STD SINGLE MATERIAL RESPONSE OVERALL
NSN5315-00-682-1811
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MS20066-191 · 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
•
STARTING EDGE SHAPE: STRAIGHT
•
STYLE DESIGNATOR: PLAIN
•
NONDEFINITIVE SPEC/STD DATA: 2 TYPE AND 1 STYLE AND C GRADE
•
MATERIAL: STEEL OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: 66 COMP 1018 TO 1035 FED STD SINGLE MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL LENGTH1.990 INCHES MINIMUM AND 2.010 INCHES MAXIMUM IN
STARTING EDGE SHAPESTRAIGHT
STYLE DESIGNATORPLAIN
OVERALL WIDTH0.1875 INCHES MINIMUM AND 0.1885 INCHES MAXIMUM IN
OVERALL HEIGHT0.1875 INCHES MINIMUM AND 0.1885 INCHES MAXIMUM IN
NONDEFINITIVE SPEC/STD DATA2 TYPE AND 1 STYLE AND C GRADE
MATERIALSTEEL OVERALL
MATERIAL DOCUMENT AND CLASSIFICATION66 COMP 1018 TO 1035 FED STD SINGLE MATERIAL RESPONSE OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
A4639Interchangeable
interchangeable cross-reference
interchangeable
4639Interchangeable
interchangeable cross-reference
interchangeable
836554Interchangeable
interchangeable cross-reference
interchangeable
502-5017Interchangeable
interchangeable cross-reference
interchangeable
26823Interchangeable
interchangeable cross-reference
interchangeable
3881549Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS20066-191?
MS20066-191 is a KEY,MACHINE.
What parts can replace MS20066-191?
There are 15 known substitutes for MS20066-191: A4639, 4639, 836554 and 12 more. Substitute compatibility should be verified for your specific system.
Is MS20066-191 still available?
MS20066-191 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