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PartsTable / COMPONENT / MS9321-05
MS9321-05 ✓ 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: STEEL COMP 430 OVERALL, thickness: 0.040 INCHES MINIMUM AND 0.045 INCHES MAXIMUM IN, hole_diameter: 0.128 INCHES NOMINAL IN, overall_diameter: 0.312 INCHES NOMINAL IN, surface_treatment: PASSIVATE OVERALL, peripheral_shape_style: ROUND. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-107-0270, 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
MS9321-05
NSN: 5310-00-107-0270
FSC: 5310
CAGE: 81343 — SOCIETY OF AUTOMOTIVE ENGINEERS INC (USA)
SPECIFICATIONS
materialSTEEL COMP 430 OVERALL
thickness0.040 INCHES MINIMUM AND 0.045 INCHES MAXIMUM IN
hole_diameter0.128 INCHES NOMINAL IN
overall_diameter0.312 INCHES NOMINAL IN
surface_treatmentPASSIVATE OVERALL
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
material_document_and_classificationAISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-107-0270
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MS9321-05 · 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
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5510 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
THICKNESS: 0.026 INCHES MINIMUM AND 0.036 INCHES MAXIMUM IN
•
HOLE DIAMETER: 0.130 INCHES MINIMUM AND 0.145 INCHES MAXIMUM IN
•
MATERIAL: STEEL COMP 321 OVERALL
•
PERIPHERAL SHAPE STYLE: ROUND
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
CENTER HOLE SHAPE STYLE: ROUND
•
SURFACE FINISH: 63.0 MICROINCHES BOTTOM
TECHNICAL CHARACTERISTICS (FLIS)
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5510 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
THICKNESS0.026 INCHES MINIMUM AND 0.036 INCHES MAXIMUM IN
HOLE DIAMETER0.130 INCHES MINIMUM AND 0.145 INCHES MAXIMUM IN
MATERIALSTEEL COMP 321 OVERALL
PERIPHERAL SHAPE STYLEROUND
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
CENTER HOLE SHAPE STYLEROUND
SURFACE FINISH63.0 MICROINCHES BOTTOM
OVERALL DIAMETER0.302 INCHES MINIMUM AND 0.322 INCHES MAXIMUM IN
SURFACE FINISH63.0 MICROINCHES TOP
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
218322Interchangeable
interchangeable cross-reference
interchangeable
AN960-4Interchangeable
interchangeable cross-reference
interchangeable
5310PL0150185Interchangeable
interchangeable cross-reference
interchangeable
146373PC47Interchangeable
interchangeable cross-reference
interchangeable
146374PC47Interchangeable
interchangeable cross-reference
interchangeable
131014Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS9321-05?
MS9321-05 is a WASHER,FLAT.
What parts can replace MS9321-05?
There are 10 known substitutes for MS9321-05: 218322, AN960-4, 5310PL0150185 and 7 more. Substitute compatibility should be verified for your specific system.
Is MS9321-05 still available?
MS9321-05 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