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Technical Data Sheet
PartsTable / COMPONENT / 13393-021
13393-021 ✓ 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 OVERALL, thickness: 0.053 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN, hole_diameter: 0.193 INCHES MINIMUM AND 0.213 INCHES MAXIMUM IN, overall_diameter: 0.433 INCHES MINIMUM AND 0.458 INCHES MAXIMUM IN, surface_treatment: CADMIUM OVERALL, peripheral_shape_style: ROUND. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-167-0818, 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
13393-021
NSN: 5310-00-167-0818
FSC: 5310
CAGE: 21439 — CURTISS-WRIGHT FLOW CONTROL SERVICE, LLC DBA ENGINEERED ARRESTING SYSTEMS - ESCO DIV CW FLOW CONTROL SVC LLC DBA (USA)
SPECIFICATIONS
materialSTEEL OVERALL
thickness0.053 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
hole_diameter0.193 INCHES MINIMUM AND 0.213 INCHES MAXIMUM IN
overall_diameter0.433 INCHES MINIMUM AND 0.458 INCHES MAXIMUM IN
surface_treatmentCADMIUM OVERALL
peripheral_shape_styleROUND
center_hole_shape_styleROUND
end_item_identificationMRAP RG-33; MULTIPLE LAUNCH ROCKET SYSTEM (MLRS); A4 BRADLEY FIGHTING VEHICLE; A3 BRADLEY FIGHTING VEHICLE; ARMORED MULTI-PURPOSE VEHICLE (AMPV)
cross-sectional_shape_styleRECTANGULAR
nondefinitive_spec/std_dataA TYPE AND 1 GRADE AND A CLASS
material_document_and_classificationMIL-S-7952 MIL SPEC SINGLE MATERIAL RESPONSE OR QQ-S-698 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationQQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5310-00-167-0818
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 13393-021 · 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
•
THICKNESS: 0.053 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
•
NONDEFINITIVE SPEC/STD DATA: A TYPE AND 1 GRADE AND A CLASS
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-7952 MIL SPEC SINGLE MATERIAL RESPONSE OR QQ-S-698 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
SURFACE TREATMENT: CADMIUM OVERALL
•
MATERIAL: STEEL OVERALL
•
OVERALL DIAMETER: 0.433 INCHES MINIMUM AND 0.458 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
THICKNESS0.053 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
END ITEM IDENTIFICATIONMRAP RG-33; MULTIPLE LAUNCH ROCKET SYSTEM (MLRS); A4 BRADLEY FIGHTING VEHICLE; A3 BRADLEY FIGHTING VEHICLE; ARMORED MULTI-PURPOSE VEHICLE (AMPV)
NONDEFINITIVE SPEC/STD DATAA TYPE AND 1 GRADE AND A CLASS
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-7952 MIL SPEC SINGLE MATERIAL RESPONSE OR QQ-S-698 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
SURFACE TREATMENTCADMIUM OVERALL
MATERIALSTEEL OVERALL
OVERALL DIAMETER0.433 INCHES MINIMUM AND 0.458 INCHES MAXIMUM IN
CENTER HOLE SHAPE STYLEROUND
PERIPHERAL SHAPE STYLEROUND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 26
90940Interchangeable
interchangeable cross-reference
interchangeable
700394P003Interchangeable
interchangeable cross-reference
interchangeable
9605Interchangeable
interchangeable cross-reference
interchangeable
725Interchangeable
interchangeable cross-reference
interchangeable
125517WCOInterchangeable
interchangeable cross-reference
interchangeable
8-5278-1-1/4X1-1/4X19-3/4Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 13393-021?
13393-021 is a WASHER,FLAT.
What parts can replace 13393-021?
There are 26 known substitutes for 13393-021: 90940, 700394P003, 9605 and 23 more. Substitute compatibility should be verified for your specific system.
Is 13393-021 still available?
13393-021 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