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PartsTable / COMPONENT / 1808399-4
1808399-4 ✓ 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 304 OVERALL, thickness: 1.0 MILLIMETERS NOMINAL MM, hole_diameter: 5.3 MILLIMETERS NOMINAL MM, overall_diameter: 10.0 MILLIMETERS NOMINAL MM, surface_treatment: PASSIVATE OVERALL, peripheral_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 5310-01-128-5151, 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
1808399-4
NSN: 5310-01-128-5151
FSC: 5310
CAGE: 03956 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
materialSTEEL COMP 304 OVERALL
thickness1.0 MILLIMETERS NOMINAL MM
hole_diameter5.3 MILLIMETERS NOMINAL MM
overall_diameter10.0 MILLIMETERS NOMINAL MM
surface_treatmentPASSIVATE OVERALL
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
surface_treatment_document_and_classificationASTM A360-78 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
NSN5310-01-128-5151
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 1808399-4 · 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
•
CENTER HOLE SHAPE STYLE: ROUND
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: ASTM A360-78 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
PERIPHERAL SHAPE STYLE: ROUND
•
MATERIAL: STEEL COMP 304 OVERALL
•
THICKNESS: 1.0 MILLIMETERS NOMINAL MM
•
OVERALL DIAMETER: 10.0 MILLIMETERS NOMINAL MM
TECHNICAL CHARACTERISTICS (FLIS)
CENTER HOLE SHAPE STYLEROUND
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONASTM A360-78 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
SURFACE TREATMENTPASSIVATE OVERALL
PERIPHERAL SHAPE STYLEROUND
MATERIALSTEEL COMP 304 OVERALL
THICKNESS1.0 MILLIMETERS NOMINAL MM
OVERALL DIAMETER10.0 MILLIMETERS NOMINAL MM
HOLE DIAMETER5.3 MILLIMETERS NOMINAL MM
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
1808399-4Interchangeable
interchangeable cross-reference
interchangeable
93475A240Interchangeable
interchangeable cross-reference
interchangeable
DIN125-M5Interchangeable
interchangeable cross-reference
interchangeable
2348-10308-39Interchangeable
interchangeable cross-reference
interchangeable
L140125Interchangeable
interchangeable cross-reference
interchangeable
L140125-05Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1808399-4?
1808399-4 is a WASHER,FLAT.
What parts can replace 1808399-4?
There are 12 known substitutes for 1808399-4: 1808399-4, 93475A240, DIN125-M5 and 9 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1808399-4?
1808399-4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-128-5151. 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