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Technical Data Sheet
PartsTable / COMPONENT / MS20066-165
MS20066-165 ✓ 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: 0.1875 INCHES MINIMUM AND 0.1885 INCHES MAXIMUM IN, overall_height: 0.1875 INCHES MINIMUM AND 0.1885 INCHES MAXIMUM IN, overall_length: 1.115 INCHES MINIMUM AND 1.135 INCHES MAXIMUM IN, hardness_rating: 40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL, style_designator: PLAIN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-730-4454, 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
MS20066-165
NSN: 5315-00-730-4454
FSC: 5315
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL COMP 1335 OR STEEL COMP 4130 OR STEEL COMP 5130 OR STEEL COMP 8630 OVERALL
overall_width0.1875 INCHES MINIMUM AND 0.1885 INCHES MAXIMUM IN
overall_height0.1875 INCHES MINIMUM AND 0.1885 INCHES MAXIMUM IN
overall_length1.115 INCHES MINIMUM AND 1.135 INCHES MAXIMUM IN
hardness_rating40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL
style_designatorPLAIN
starting_edge_shapeSTRAIGHT
nondefinitive_spec/std_data2 TYPE AND 1 STYLE AND B GRADE
material_document_and_classification66 FED STD ALL MATERIAL RESPONSES OVERALL
NSN5315-00-730-4454
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MS20066-165 · 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
•
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
•
NONDEFINITIVE SPEC/STD DATA: 2 TYPE AND 1 STYLE AND B GRADE
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL HEIGHT0.1875 INCHES MINIMUM AND 0.1885 INCHES MAXIMUM IN
STARTING EDGE SHAPESTRAIGHT
OVERALL LENGTH1.115 INCHES MINIMUM AND 1.135 INCHES MAXIMUM IN
STYLE DESIGNATORPLAIN
HARDNESS RATING40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL
OVERALL WIDTH0.1875 INCHES MINIMUM AND 0.1885 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATION66 FED STD ALL MATERIAL RESPONSES OVERALL
NONDEFINITIVE SPEC/STD DATA2 TYPE AND 1 STYLE AND B GRADE
MATERIALSTEEL COMP 1335 OR STEEL COMP 4130 OR STEEL COMP 5130 OR STEEL COMP 8630 OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
D305Interchangeable
interchangeable cross-reference
interchangeable
530937Interchangeable
interchangeable cross-reference
interchangeable
1917247Interchangeable
interchangeable cross-reference
interchangeable
OO-K-220Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS20066-165?
MS20066-165 is a KEY,MACHINE.
What parts can replace MS20066-165?
There are 4 known substitutes for MS20066-165: D305, 530937, 1917247 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MS20066-165?
MS20066-165 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-730-4454. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026