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Technical Data Sheet
PartsTable / COMPONENT / MS20066-544
MS20066-544 ✓ 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 COMP 1335 OR STEEL COMP 4130 OR STEEL COMP 5130 OR STEEL COMP 8630 OVERALL, overall_width: 0.500 INCHES MINIMUM AND 0.501 INCHES MAXIMUM IN, overall_height: 0.500 INCHES MINIMUM AND 0.501 INCHES MAXIMUM IN, overall_length: 2.990 INCHES MINIMUM AND 3.010 INCHES MAXIMUM IN, shear_strength: 90000 SINGLE POUNDS PER SQUARE INCH, hardness_rating: 40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-732-1020, 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
MS20066-544
NSN: 5315-00-732-1020
FSC: 5315
CAGE: 80205 — NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE (USA)
SPECIFICATIONS
materialSTEEL COMP 1335 OR STEEL COMP 4130 OR STEEL COMP 5130 OR STEEL COMP 8630 OVERALL
overall_width0.500 INCHES MINIMUM AND 0.501 INCHES MAXIMUM IN
overall_height0.500 INCHES MINIMUM AND 0.501 INCHES MAXIMUM IN
overall_length2.990 INCHES MINIMUM AND 3.010 INCHES MAXIMUM IN
shear_strength90000 SINGLE POUNDS PER SQUARE INCH
hardness_rating40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL
style_designatorPLAIN
starting_edge_shapeSTRAIGHT
material_document_and_classification66 FED STD ALL MATERIAL RESPONSES OVERALL
NSN5315-00-732-1020
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MS20066-544 · 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
•
SHEAR STRENGTH: 90000 SINGLE POUNDS PER SQUARE INCH
•
MATERIAL: STEEL COMP 1335 OR STEEL COMP 4130 OR STEEL COMP 5130 OR STEEL COMP 8630 OVERALL
•
STARTING EDGE SHAPE: STRAIGHT
•
HARDNESS RATING: 40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: 66 FED STD ALL MATERIAL RESPONSES OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL LENGTH2.990 INCHES MINIMUM AND 3.010 INCHES MAXIMUM IN
OVERALL WIDTH0.500 INCHES MINIMUM AND 0.501 INCHES MAXIMUM IN
OVERALL HEIGHT0.500 INCHES MINIMUM AND 0.501 INCHES MAXIMUM IN
SHEAR STRENGTH90000 SINGLE POUNDS PER SQUARE INCH
MATERIALSTEEL COMP 1335 OR STEEL COMP 4130 OR STEEL COMP 5130 OR STEEL COMP 8630 OVERALL
STARTING EDGE SHAPESTRAIGHT
HARDNESS RATING40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL
MATERIAL DOCUMENT AND CLASSIFICATION66 FED STD ALL MATERIAL RESPONSES OVERALL
STYLE DESIGNATORPLAIN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
00K220Interchangeable
interchangeable cross-reference
interchangeable
MS20066-2Interchangeable
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 MS20066-544?
MS20066-544 is a KEY,MACHINE.
What parts can replace MS20066-544?
There are 9 known substitutes for MS20066-544: 00K220, MS20066-2, 55-22081 PART 2 and 6 more. Substitute compatibility should be verified for your specific system.
Is MS20066-544 still available?
MS20066-544 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