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Technical Data Sheet
PartsTable / COMPONENT / 812304-00
812304-00 ✓ 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 270 OR COPPER ALLOY 268 OVERALL, thickness: 0.022 INCHES MINIMUM AND 0.042 INCHES MAXIMUM IN, hole_diameter: 0.164 INCHES MINIMUM AND 0.184 INCHES MAXIMUM IN, overall_diameter: 0.370 INCHES MINIMUM AND 0.395 INCHES MAXIMUM IN, surface_treatment: TIN OVERALL, peripheral_shape_style: ROUND. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-264-1389, 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
812304-00
NSN: 5310-00-264-1389
FSC: 5310
CAGE: 32345 — DEFENSE REDUCTION AGENCY (USA)
SPECIFICATIONS
materialCOPPER ALLOY 270 OR COPPER ALLOY 268 OVERALL
thickness0.022 INCHES MINIMUM AND 0.042 INCHES MAXIMUM IN
hole_diameter0.164 INCHES MINIMUM AND 0.184 INCHES MAXIMUM IN
overall_diameter0.370 INCHES MINIMUM AND 0.395 INCHES MAXIMUM IN
surface_treatmentTIN OVERALL
peripheral_shape_styleROUND
center_hole_shape_styleROUND
end_item_identificationMULTIPLE LAUNCH ROCKET SYSTEM (MLRS)
cross-sectional_shape_styleRECTANGULAR
material_document_and_classificationSAE1/2 HARD ASSN STD 1ST MATERIAL RESPONSE AND QQ-B-626 1/2 HARD FED SPEC 2ND MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationMIL-T-10727,TYPE 1 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5310-00-264-1389
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 812304-00 · 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
•
PERIPHERAL SHAPE STYLE: ROUND
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE1/2 HARD ASSN STD 1ST MATERIAL RESPONSE AND QQ-B-626 1/2 HARD FED SPEC 2ND MATERIAL RESPONSE OVERALL
•
MATERIAL: COPPER ALLOY 270 OR COPPER ALLOY 268 OVERALL
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
OVERALL DIAMETER: 0.370 INCHES MINIMUM AND 0.395 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-T-10727,TYPE 1 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
SURFACE TREATMENT: TIN OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
PERIPHERAL SHAPE STYLEROUND
MATERIAL DOCUMENT AND CLASSIFICATIONSAE1/2 HARD ASSN STD 1ST MATERIAL RESPONSE AND QQ-B-626 1/2 HARD FED SPEC 2ND MATERIAL RESPONSE OVERALL
MATERIALCOPPER ALLOY 270 OR COPPER ALLOY 268 OVERALL
END ITEM IDENTIFICATIONMULTIPLE LAUNCH ROCKET SYSTEM (MLRS)
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
OVERALL DIAMETER0.370 INCHES MINIMUM AND 0.395 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-T-10727,TYPE 1 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
SURFACE TREATMENTTIN OVERALL
HOLE DIAMETER0.164 INCHES MINIMUM AND 0.184 INCHES MAXIMUM IN
CENTER HOLE SHAPE STYLEROUND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 22
5123Interchangeable
interchangeable cross-reference
interchangeable
534972-1Interchangeable
interchangeable cross-reference
interchangeable
250-DCZInterchangeable
interchangeable cross-reference
interchangeable
40Interchangeable
interchangeable cross-reference
interchangeable
6440Interchangeable
interchangeable cross-reference
interchangeable
5416K22Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 812304-00?
812304-00 is a WASHER,FLAT.
What parts can replace 812304-00?
There are 22 known substitutes for 812304-00: 5123, 534972-1, 250-DCZ and 19 more. Substitute compatibility should be verified for your specific system.
Is 812304-00 still available?
812304-00 is currently cancelled.
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Last verified: July 2026