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MS20066-79 — KEY,MACHINE

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

MS20066-79: KEY,MACHINE.

The KEY,MACHINE is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, overall_width: 0.125 INCHES MINIMUM AND 0.126 INCHES MAXIMUM IN, overall_height: 0.125 INCHES MINIMUM AND 0.126 INCHES MAXIMUM IN, overall_length: 0.865 INCHES MINIMUM AND 0.885 INCHES MAXIMUM IN, shear_strength: 75000 SINGLE POUNDS PER SQUARE INCH, shoulder_width: 0.125 INCHES MINIMUM AND 0.126 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5315-00-729-9028, 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
MS20066-79
NSN: 5315-00-729-9028
FSC: 5315 — Nails, Machine Keys, and Pins
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
overall_width0.125 INCHES MINIMUM AND 0.126 INCHES MAXIMUM IN
overall_height0.125 INCHES MINIMUM AND 0.126 INCHES MAXIMUM IN
overall_length0.865 INCHES MINIMUM AND 0.885 INCHES MAXIMUM IN
shear_strength75000 SINGLE POUNDS PER SQUARE INCH
shoulder_width0.125 INCHES MINIMUM AND 0.126 INCHES MAXIMUM IN
style_designatorPLAIN
surface_treatmentPASSIVATE OVERALL
starting_edge_shapeSTRAIGHT
end_item_identificationMULTIPLE LAUNCH ROCKET SYSTEM (MLRS)
material_document_and_classification66 FED STD SINGLE MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5315-00-729-9028
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MS20066-79 · 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
•
SHOULDER WIDTH: 0.125 INCHES MINIMUM AND 0.126 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
STARTING EDGE SHAPE: STRAIGHT
•
STYLE DESIGNATOR: PLAIN
•
MATERIAL DOCUMENT AND CLASSIFICATION: 66 FED STD SINGLE MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.125 INCHES MINIMUM AND 0.126 INCHES MAXIMUM IN
SHOULDER WIDTH0.125 INCHES MINIMUM AND 0.126 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
STARTING EDGE SHAPESTRAIGHT
STYLE DESIGNATORPLAIN
MATERIAL DOCUMENT AND CLASSIFICATION66 FED STD SINGLE MATERIAL RESPONSE OVERALL
OVERALL LENGTH0.865 INCHES MINIMUM AND 0.885 INCHES MAXIMUM IN
OVERALL WIDTH0.125 INCHES MINIMUM AND 0.126 INCHES MAXIMUM IN
SURFACE TREATMENTPASSIVATE OVERALL
SHEAR STRENGTH75000 SINGLE POUNDS PER SQUARE INCH
OTHER ITEMS IN FSC 5315 — Nails, Machine Keys, and Pins
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5315-00-000-1037 5315-00-000-1067 5315-00-000-1245 5315-00-000-1372 5315-00-000-1412 5315-00-001-1571 5315-00-001-1572 5315-00-001-1602
SUBSTITUTES & CROSS-REFERENCES 3
2WC252Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
0740692Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
W4902-14SSReference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is MS20066-79?
MS20066-79 is a KEY,MACHINE.
What parts can replace MS20066-79?
There are 3 known substitutes for MS20066-79: 2WC252, 0740692, W4902-14SS. Substitute compatibility should be verified for your specific system.
What is the NSN for MS20066-79?
MS20066-79 is cataloged in the U.S. Government catalog under NSN 5315-00-729-9028. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.