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811381 ✓ 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 1010 OVERALL, thickness: 0.094 INCHES NOMINAL IN, hole_diameter: 0.516 INCHES NOMINAL IN, overall_diameter: 1.250 INCHES NOMINAL IN, surface_treatment: ZINC OVERALL, peripheral_shape_style: ROUND. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-270-2055, 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
811381
NSN: 5310-00-270-2055
FSC: 5310
CAGE: 89619 — MACK TRUCKS, INC. DBA MACUNGIE OPERATIONS DIV LEHIGH VALLEY OPERATIONS (USA)
SPECIFICATIONS
materialSTEEL COMP 1010 OVERALL
thickness0.094 INCHES NOMINAL IN
hole_diameter0.516 INCHES NOMINAL IN
overall_diameter1.250 INCHES NOMINAL IN
surface_treatmentZINC OVERALL
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
material_document_and_classificationSAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-270-2055
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 811381 · 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: 0.094 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
MATERIAL: STEEL COMP 1010 OVERALL
•
HOLE DIAMETER: 0.516 INCHES NOMINAL IN
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
OVERALL DIAMETER: 1.250 INCHES NOMINAL IN
•
CENTER HOLE SHAPE STYLE: ROUND
•
SURFACE TREATMENT: ZINC OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
THICKNESS0.094 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONSAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
MATERIALSTEEL COMP 1010 OVERALL
HOLE DIAMETER0.516 INCHES NOMINAL IN
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
OVERALL DIAMETER1.250 INCHES NOMINAL IN
CENTER HOLE SHAPE STYLEROUND
SURFACE TREATMENTZINC OVERALL
PERIPHERAL SHAPE STYLEROUND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
120389Interchangeable
interchangeable cross-reference
interchangeable
7-702759Interchangeable
interchangeable cross-reference
interchangeable
MS27183-15Interchangeable
interchangeable cross-reference
interchangeable
AN945-6Interchangeable
interchangeable cross-reference
interchangeable
331967Interchangeable
interchangeable cross-reference
interchangeable
358118Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 811381?
811381 is a WASHER,FLAT.
What parts can replace 811381?
There are 7 known substitutes for 811381: 120389, 7-702759, MS27183-15 and 4 more. Substitute compatibility should be verified for your specific system.
Is 811381 still available?
811381 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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Last verified: July 2026