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Technical Data Sheet
PartsTable / COMPONENT / OO-K-220
OO-K-220 ✓ 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: 0.625 INCHES MINIMUM AND 0.626 INCHES MAXIMUM IN, overall_height: 0.625 INCHES MINIMUM AND 0.626 INCHES MAXIMUM IN, overall_length: 3.000 INCHES NOMINAL IN, shear_strength: 60000 SINGLE POUNDS PER SQUARE INCH, hardness_rating: 40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-051-6105, 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
OO-K-220
NSN: 5315-00-051-6105
FSC: 5315
CAGE: 81348 — FEDERAL SPECIFICATIONS PROMULGATED BY GENERAL SERVICES ADMINISTRATION WASHINGTON DC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
overall_width0.625 INCHES MINIMUM AND 0.626 INCHES MAXIMUM IN
overall_height0.625 INCHES MINIMUM AND 0.626 INCHES MAXIMUM IN
overall_length3.000 INCHES NOMINAL IN
shear_strength60000 SINGLE POUNDS PER SQUARE INCH
hardness_rating40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL
style_designatorPLAIN
surface_treatmentPASSIVATE OVERALL
starting_edge_shapeROUNDROUND
starting_edge_radius0.062 INCHES NOMINAL0.062 INCHES NOMINAL IN
nondefinitive_spec/std_data2 TYPE AND 2 TYPE AND 2 STYLE AND 2 STYLE AND B GRADEB GRADE
specification/standard_data96906-MS20066 GOVERNMENT STANDARD
NSN5315-00-051-6105
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: OO-K-220 · 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
•
NONDEFINITIVE SPEC/STD DATA: 2 TYPE AND 1 STYLE AND A GRADE
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: 66 FED STD ALL MATERIAL RESPONSES OVERALL
•
STYLE DESIGNATOR: PLAIN
TECHNICAL CHARACTERISTICS (FLIS)
STARTING EDGE SHAPESTRAIGHT
NONDEFINITIVE SPEC/STD DATA2 TYPE AND 1 STYLE AND A GRADE
OVERALL WIDTH0.125 INCHES MINIMUM AND 0.126 INCHES MAXIMUM IN
SURFACE TREATMENTPASSIVATE OVERALL
MATERIAL DOCUMENT AND CLASSIFICATION66 FED STD ALL MATERIAL RESPONSES OVERALL
OVERALL HEIGHT0.125 INCHES MINIMUM AND 0.126 INCHES MAXIMUM IN
OVERALL LENGTH0.302 INCHES MINIMUM AND 0.322 INCHES MAXIMUM IN
STYLE DESIGNATORPLAIN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
MATERIALSTEEL COMP 403 OR STEEL COMP 405 OR STEEL COMP 410 OR STEEL COMP 446 OR STEEL COMP 414 OR STEEL COMP 416SE OR STEEL COMP 416 OR STEEL COMP 420 OR STEEL COMP 430 OR STEEL COMP 430F OR STEEL COMP 430FSE OR STEEL COMP 431 OR STEEL COMP 440A OR STEEL COMP 440B OR STEEL COMP 440C OR STEEL COMP 442 OVERALL A
VERIFIED SUBSTITUTES & CROSS-REFERENCES 1
MS20066-74Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is OO-K-220?
OO-K-220 is a KEY,MACHINE.
What parts can replace OO-K-220?
There is 1 known substitute for OO-K-220: MS20066-74. Substitute compatibility should be verified for your specific system.
What is the NSN for OO-K-220?
OO-K-220 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-051-6105. 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