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PartsTable / COMPONENT / MS21964-10
MS21964-10 ✓ 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 WASHER,FLAT is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY OVERALL, thickness: 0.020 INCHES MINIMUM AND 0.030 INCHES MAXIMUM IN, hole_diameter: 0.307 INCHES MINIMUM AND 0.317 INCHES MAXIMUM IN, overall_diameter: 0.448 INCHES MINIMUM AND 0.458 INCHES MAXIMUM IN, peripheral_shape_style: ROUND, center_hole_shape_style: ROUND. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-209-3340, 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
MS21964-10
NSN: 5310-00-209-3340
FSC: 5310
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
thickness0.020 INCHES MINIMUM AND 0.030 INCHES MAXIMUM IN
hole_diameter0.307 INCHES MINIMUM AND 0.317 INCHES MAXIMUM IN
overall_diameter0.448 INCHES MINIMUM AND 0.458 INCHES MAXIMUM IN
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
material_document_and_classificationQQ-C-576 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-209-3340
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MS21964-10 · 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
•
HOLE DIAMETER: 0.307 INCHES MINIMUM AND 0.317 INCHES MAXIMUM IN
•
CENTER HOLE SHAPE STYLE: ROUND
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
MATERIAL: COPPER ALLOY OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-C-576 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
THICKNESS: 0.020 INCHES MINIMUM AND 0.030 INCHES MAXIMUM IN
•
OVERALL DIAMETER: 0.448 INCHES MINIMUM AND 0.458 INCHES MAXIMUM IN
•
PERIPHERAL SHAPE STYLE: ROUND
TECHNICAL CHARACTERISTICS (FLIS)
HOLE DIAMETER0.307 INCHES MINIMUM AND 0.317 INCHES MAXIMUM IN
CENTER HOLE SHAPE STYLEROUND
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
MATERIALCOPPER ALLOY OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-C-576 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
THICKNESS0.020 INCHES MINIMUM AND 0.030 INCHES MAXIMUM IN
OVERALL DIAMETER0.448 INCHES MINIMUM AND 0.458 INCHES MAXIMUM IN
PERIPHERAL SHAPE STYLEROUND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 25
M7560/1-14Interchangeable
interchangeable cross-reference
interchangeable
MS21964-14Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-7560Interchangeable
interchangeable cross-reference
interchangeable
MIL-V-7560Interchangeable
interchangeable cross-reference
interchangeable
1315Interchangeable
interchangeable cross-reference
interchangeable
2957Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS21964-10?
MS21964-10 is a WASHER,FLAT.
What parts can replace MS21964-10?
There are 25 known substitutes for MS21964-10: M7560/1-14, MS21964-14, MIL-DTL-7560 and 22 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MS21964-10?
MS21964-10 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-209-3340. 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