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03311M1320-103 — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

03311M1320-103: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include width: 0.50 INCHES NOMINAL IN, material: ALUMINUM ALLOY 7075 OVERALL, thickness: 0.064 INCHES NOMINAL IN, end_cut_angle: 12.0 RADIANS NOMINAL, hole_diameter: 0.250 INCHES NOMINAL IN, overall_diameter: 0.50 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-618-6358, 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
03311M1320-103
NSN: 5310-01-618-6358
FSC: 5310 — Nuts and Washers
CAGE: 02591 — NAVAL AIR WARFARE CTR AIRCRAFT DIV (USA)
SPECIFICATIONS
width0.50 INCHES NOMINAL IN
materialALUMINUM ALLOY 7075 OVERALL
thickness0.064 INCHES NOMINAL IN
end_cut_angle12.0 RADIANS NOMINAL
hole_diameter0.250 INCHES NOMINAL IN
overall_diameter0.50 INCHES NOMINAL IN
surface_treatmentCHROMATE AND PRIMER OVERALL
peripheral_shape_styleDEE
center_hole_shape_styleROUND
end_item_identificationRADAR PROCESS
cross-sectional_shape_styleRECTANGULAR
material_document_and_classificationQQ-A-250/12 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5310-01-618-6358
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 03311M1320-103 · 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
•
END CUT ANGLE: 12.0 RADIANS NOMINAL
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-C-5541,CL 3 MIL SPEC 1ST TREATMENT RESPONSE AND MIL-PRF-23377,TY I,CL C2 MIL SPEC 2ND TREATMENT RESPONSE OVERALL
•
OVERALL DIAMETER: 0.50 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-A-250/12 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
SURFACE TREATMENT: CHROMATE AND PRIMER OVERALL
•
PERIPHERAL SHAPE STYLE: DEE
•
WIDTH: 0.50 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
END CUT ANGLE12.0 RADIANS NOMINAL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-C-5541,CL 3 MIL SPEC 1ST TREATMENT RESPONSE AND MIL-PRF-23377,TY I,CL C2 MIL SPEC 2ND TREATMENT RESPONSE OVERALL
OVERALL DIAMETER0.50 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-250/12 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
SURFACE TREATMENTCHROMATE AND PRIMER OVERALL
PERIPHERAL SHAPE STYLEDEE
WIDTH0.50 INCHES NOMINAL IN
PART NAME ASSIGNED BY CONTROLLING AGENCYWASHER,RADIUSED;WASHER FRAME 29
END ITEM IDENTIFICATIONRADAR PROCESS
SUBSTITUTES & CROSS-REFERENCES 2
03311M1320Reference document
Same NSN cross-reference
Reference document — Drawing number reference only
75A325991-2003Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 03311M1320-103?
03311M1320-103 is a WASHER,FLAT.
What parts can replace 03311M1320-103?
There are 2 known substitutes for 03311M1320-103: 03311M1320, 75A325991-2003. Substitute compatibility should be verified for your specific system.
What is the NSN for 03311M1320-103?
03311M1320-103 is cataloged in the U.S. Government catalog under NSN 5310-01-618-6358. 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.